Ported nearfield monitors basically junk?

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droddey
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Re:Ported nearfield monitors basically junk? 2012/04/20 19:41:28 (permalink)
Well, the issue with ARC isn't very complex at all. It's that it can only handle one side of the peaks and cancellations problem. That's not iffy or corner case science, it's fundamental stuff. If you can only handle one side of the problem, then it's only half a solution.  And the half that isn't getting solved (in most of the small, rectangular rooms we folks tend to be in), will be vastly worse than potentially less than perfect bass reproduction due to a port. We would not ever be here debating any speakers that were 10 or 20dB off at certain frequences, because such a product would never make it to market.
post edited by droddey - 2012/04/20 19:43:01

Dean Roddey
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Jonbouy
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Re:Ported nearfield monitors basically junk? 2012/04/20 19:47:53 (permalink)
droddey


Well, the issue with ARC isn't very complex at all. It's that it can only handle one side of the peaks and cancellations problem. That's not iffy or corner case science, it's fundamental stuff. If you can only handle one side of the problem, then it's only half a solution.  And the half that isn't getting solved (in most of the small, rectangular rooms we folks tend to be in), will be vastly worse than potentially less than perfect bass reproduction due to a port. We would not ever be here debating any speakers that were 10 or 20dB off at certain frequences, because such a product would never make it to market.


I mix on cans without ARC mostly because my room is sh** and I use a pair MA15D's.

But I wouldn't mention that here, people would have me quit straight away, or even worse I might be held up for ridicule.  Imagine that!

I HAVE to go by learning my system with reference material, I won some good prizes in a mixing contest last week against some pretty well armed gear heads too and judged by a 'proper' engineer in a damn fine environment.

What does your calculator tell me I'm missing as a result?  Mine shows around £20,000 currently.

And hey, guess what, I already get the issues with ARC.  I understand what they are.  I get what it does too and can understand where it would be a help to some.

Mike already put the info up on making an informed speaker choice, without needing to endorse or bash a particular maker.  I like it when he does that.
post edited by Jonbouy - 2012/04/20 20:10:21

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Jimbo21
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Re:Ported nearfield monitors basically junk? 2012/04/20 20:13:45 (permalink)
I was paraphrasing the "basically junk" comment in fairness to Mr. Senior. But he did say that "The less money you're going to spend on monitors, the more you should approach ported models armed with holy water and garlic!" He then mentions the Rokit 8, DSM2 and Adam A7x as examples. He also says one needs to spend well over $1500 "for a pair of nearfields that can reliably deliver what you need to mix competitively". I know $1500 will get you the Adam A7x's, so maybe they're borderline in his opinion. I was frankly unaware that there was an issue with port vs non-port designs. I'm happy to be enlightened a little bit, which is why I got the book in the first place and knew I'd get some interesting, varied opinions and maybe even learn a little more. Thanks!
post edited by Jimbo21 - 2012/04/20 20:16:18

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spacealf
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Re:Ported nearfield monitors basically junk? 2012/04/20 20:35:16 (permalink)
Speakers are the weak link still in the end. Even if you have ARC whatever it still is only going to give you the same situation in the end with mixing. But there are science papers and such on this topic of speakers (transducers) and enclosures and as such those papers can be found on the Internet if doing a search for them. No doubt this has been going on for a long time, because before, there were EQ vinyl records, Decibel Sound Level Meters and room measurements before anything digital came out.

 
 
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droddey
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Re:Ported nearfield monitors basically junk? 2012/04/20 21:06:38 (permalink)
Jonbouy

I HAVE to go by learning my system with reference material, I won some good prizes in a mixing contest last week against some pretty well armed gear heads too and judged by a 'proper' engineer in a damn fine environment.

What does your calculator tell me I'm missing as a result?  Mine shows around £20,000 currently.

And hey, guess what, I already get the issues with ARC.  I understand what they are.  I get what it does too and can understand where it would be a help to some.

Mike already put the info up on making an informed speaker choice, without needing to endorse or bash a particular maker.  I like it when he does that.
Stating a fact is not bashing, if that's what you were implying I was doing. Judging by a lot of comments by people who use it, I sort of doubt that they understand the actual issues and what its limitations are.

Dean Roddey
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mattplaysguitar
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Re:Ported nearfield monitors basically junk? 2012/04/20 21:11:47 (permalink)
Jimbo21


 Just got "Mixing Secrets for the Small Studio" by Mike Senior and right in the first section he talks about unless you have really expensive monitors the low end transients are fairly skewed in that the "porting hinders the monitor's ability to track moment-to-moment changes in the mix signal. Specifically, the port causes any spectral energy at it's resonant frequency to ring on for a short time, and while it's this resonant buildup that generated the port's flattering low-frequency level boost for a constant noise signal, the same quality also adds short resonant tails to fleeting percussive attack noises (transients)". He also points out that "the resonance not only disguises the true decay attributes of the sound itself, but it can also make it difficult to judge the character and level of short duration studio effects (such as modulated delays and reverb), which are useful at mixdown".

So, understand this flaw and be aware of the potential issue. Mix with this in mind. Check on good headphones. Check on different monitors with different resonant frequencies. And you're done.


Notice all pro guys tend to check on multiple monitors in the studio anyway? This one particular flaw doesn't really sound like too big any issue we can't get around. In the end, we're probably better off saving $2000 and spending that on 6 months of good singing lessons. Your songs will sound much better. I've pretty much stopped buying gear now and I'm running off pretty basic stuff - Yamaha HS80m's, pair of Rode K2's (well those are mid/high end), a 58 and in through a UA25-ex. I honestly think that's plenty to get a really great sound if I do it right. I'm now going to invest probably about $2000 in singing lessons as I approach recording vocals for my album at the end of the year. Weak points. Find them and fix them first. Stressing about your monitors not reproducing a few sets of low end frequencies accurately really shouldn't be too big a concern from the overall picture unless you have already fixed everything else and this is currently your weakest point. And you're rich.


By the way, this is not intended to be a flame or anything, just a bit of a reality check  I'm always grateful to read up stuff like this. I'm an engineer, so I love this technical stuff. But it's important for us to try not to get too caught up in it too. Always need to keep thinking back to the big picture and remembering what matters. Otherwise we'll all be broke and still make terrible music!  But on the other hand, there'll be plenty of audiophile porn for the lonely nights!


Currently recording my first album, so if you like my music, please follow me on Facebook!
http://www.facebook.com/mattlyonsmusic

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Rimshot
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Re:Ported nearfield monitors basically junk? 2012/04/20 21:16:58 (permalink)
I agree with you Matt.  Hey, nobody chimed in on my new pair of very small D5's from Equator.  For my dining room, they are working great!  Everything is relative. 

Rimshot


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mattplaysguitar
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Re:Ported nearfield monitors basically junk? 2012/04/20 21:27:19 (permalink)


Matt I must catch up with you sometime. I might be able to catch up with you at SoundCorp or something, maybe we can have a coffee! I am not that far away from there either. (Kensington) Or I could come over and visit. It's pretty rare to meet someone on the forum who lives in Melbourne.

Yeah that would be good. Maybe drop in to SoundCorp on a Friday afternoon or something? There is a great coffee place just round the corner from there.


Currently recording my first album, so if you like my music, please follow me on Facebook!
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#38
foxwolfen
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Re:Ported nearfield monitors basically junk? 2012/04/20 23:54:54 (permalink)
The article is not wrong. I have actually "damped" the ports on some of my speakers due to very audible port distortion. I would rather have slightly less bass response and clear sound.

That being said, for monitoring I use KRK Rockets. I have no compliant with the port design on them. If there is distortion, its below my audible threshold.

So while the author is speaking true, he is overgeneralizing IMO.

Cheers
Shad

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Jonbouy
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Re:Ported nearfield monitors basically junk? 2012/04/21 03:53:13 (permalink)
droddey


Jonbouy

I HAVE to go by learning my system with reference material, I won some good prizes in a mixing contest last week against some pretty well armed gear heads too and judged by a 'proper' engineer in a damn fine environment.

What does your calculator tell me I'm missing as a result?  Mine shows around £20,000 currently.

And hey, guess what, I already get the issues with ARC.  I understand what they are.  I get what it does too and can understand where it would be a help to some.

Mike already put the info up on making an informed speaker choice, without needing to endorse or bash a particular maker.  I like it when he does that.
Stating a fact is not bashing, if that's what you were implying I was doing. Judging by a lot of comments by people who use it, I sort of doubt that they understand the actual issues and what its limitations are.


Yeah, sorry Dean.

I've been jumping up and down on the issue on another thread and a bit of that spilled into this thread, your thoughts were completely accurate.

I was trying to feed McCue some words I felt he needed to eat and you innocently stepped in that pile.  I hold my hands up I responded like a complete arse.

"We can't do anything to change the world until capitalism crumbles.
In the meantime we should all go shopping to console ourselves" - Banksy
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The Maillard Reaction
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Re:Ported nearfield monitors basically junk? 2012/04/21 07:26:56 (permalink)

Here's a port made for when you don't think the port design is right, or you think you might want to second guess the port design:



It's is described as Aperiodic port or vent and it is marketed as a "Variovent"

It's stuffed with stuffing and you use more or less to taste.


best regards,
mike


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The Maillard Reaction
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Re:Ported nearfield monitors basically junk? 2012/04/21 07:29:03 (permalink)


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Jimbo21
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Re:Ported nearfield monitors basically junk? 2012/04/21 08:41:52 (permalink)
Thanks for the links Mike.

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foxwolfen
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Re:Ported nearfield monitors basically junk? 2012/04/21 11:21:20 (permalink)
mattplaysguitar


Does anyone else here think that the KRK Rockits really just sound like consumer speakers and don't really deserve the label of 'monitors'? Especially the 5's. VERY hyped low end. Then the bass on all of them sounds really disjointed and not smooth throughout the whole frequency response. A few people have mentioned them and I just really don't think they are a good monitor. The VXT's on the other hand... Wow. I thought the Yamaha's are much flatter and neutral sounding. The bass doesn't sound as 'good', but that's not what you want in a monitor. I just don't get all the hype over these Rockit's..

Its funny, but that is exactly why I bought the KRKs. Compared to others in its price range, it had the most natural sound, and had less trick circuitry to boost the low end like many others. But they are certainly not perfect. They lack warmth for instance. But the positives are they sound the same (to me) over a broad range of volumes and have enough definition that subtle changes in the mix can be heard. They are also very flexible in their use.

As someone else pointed out, I also do not use one single set of monitors, but listen to a mix on a variety of them, including headphones. Each type tell me something a little different about the mix. 

A scientist knows more & more about less & less till he knows everything about nothing, while a philosopher knows less & less about more & more till he knows nothing about everything.

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#44
Danny Danzi
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Re:Ported nearfield monitors basically junk? 2012/04/21 11:41:28 (permalink)
I have old Rokit 8's and absolutely love them. Of course they are tuned with ARC. Without, they were a bit bass heavy for me. They were left over from the other studio owner in my new place. I listened to them and loved them, so I kept them.

As for ported, no doubt in my mind there are probably some issues there. But, my A-7's have been so great to me (ARC'd as well) I have 3 sets of them and really love how they sound.

To be honest, with any sort of issue like this (even if you use ARC) there will be scientific proof that shows all the issues and errors. The thing I can't get my head around is, sometimes that stuff is not going to be as audible as people may make it sound. Sort of like using a compressor being a n00b....you'll only know you're using it when you hear it instead of knowing how to use it to where you don't actually hear it working at all.

I think this is where some people go astray and live for the science end. The thing with everything in my opinion is, we just about always need examples on what to listen for so we too can hear what the deal is. Just like the people that don't believe in ARC...if they can't hear it themselves, no one can blame them for their disbelief. I can't show proof on "what to listen for" other than if I said "ok, here's a mix without ARC, here's one with it..which sounds better and why is one better than the other?"

So I think the same may be the case here with ported monitors. Some may hear a difference, otheres may not and may need to know what to listen for really. I think that's the key to this whole field quite honestly. Those of you that may not think you are good engineers probably ARE if you had someone show you things or explain things to you to where you heard the examples to associate one thing to another. But I love my ported monitors. :)

-Danny

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#45
drewfx1
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Re:Ported nearfield monitors basically junk? 2012/04/21 13:06:01 (permalink)
Danny, sometimes (at least for someone like me) the purpose of doing the science is so you know exactly what to listen for and/or whether it's worth worrying about.

For instance one of these days I'm going to build some  "bad" low pass filters in Reaktor largely just so that I can hear exaggerated examples of exactly what certain filter artifacts sound like, and at a frequency much lower than the 20kHz (or whatever) that some people claim they can hear the artifacts at.

 In order, then, to discover the limit of deepest tones, it is necessary not only to produce very violent agitations in the air but to give these the form of simple pendular vibrations. - Hermann von Helmholtz, predicting the role of the electric bassist in 1877.
#46
Danny Danzi
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Re:Ported nearfield monitors basically junk? 2012/04/21 13:47:25 (permalink)
drewfx1


Danny, sometimes (at least for someone like me) the purpose of doing the science is so you know exactly what to listen for and/or whether it's worth worrying about.

For instance one of these days I'm going to build some  "bad" low pass filters in Reaktor largely just so that I can hear exaggerated examples of exactly what certain filter artifacts sound like, and at a frequency much lower than the 20kHz (or whatever) that some people claim they can hear the artifacts at.

Right...totally understood. But in the case of Mike Senior, could it have been the room he tested in or something else that would make him take such a stand on ported monitors? Like...is there something he heard that maybe we can't? This is what I mean...the science is all well and good, but what happens when you can't hear what may be causing something to not give the right results? Wouldn't it also depend on how much this issue is making a difference for certain individuals in certain rooms doing certain styles of music?
 
Like for example Drew...say we really did massive experimenting on ARC and we find out it has so many flaws, it makes me wonder how I've gotten so lucky with it. LOL! Now, if those flaws or some scientific print out shows us the truth, yet I can't hear this truth and my mixes are sounding good, clients aren't complaining and everything seems to be in good shape over here, what did the science teach me if there's nothing I can hear?
 
And..what if the reason for me not hearing it is due to this particular problem not affecting me as greatly as it may someone else? See my point? If the science shows me things that are wrong yet I can't hear these things enough to where it's hurting me, how do I learn to hear them without being physically made aware as to what I should be listening for? Does that make sense at all? LOL!
 
Could we then apply that to ported monitors? If we can't hear what Mike Senior is telling us...which for sure he has some credibility to mention, and science shows us flaws with ported monitors that some of us may not hear, how or why would one worry about it? Can you see my point at all? This is where this stuff gets confusing to me to where I just throw my hands up in the air. Shouldn't we hear something wrong...or is it more you fix the something that is wrong that science provides and then you see if you can hear a difference for the better? If you're not having apparent problems to begin with and you just take the science as factual no matter what it pertains to, aren't we sort of searching for the sake of searching to where one could get totally involved with this to where it could actually deter them from getting anything done? LOL!!! These have always been my issues really. It's almost like people pry into this stuff "for the sake of".
 
I can totally see it if someone were having huge issues with ported monitors or any monitors really...or lack of room correction messing up their mixes etc. But if you don't have those problems and get good results, to me it seems a bit like science for the sake of science and just pretty much lab work, no?
 
-Danny
post edited by Danny Danzi - 2012/04/21 13:51:01

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drewfx1
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Re:Ported nearfield monitors basically junk? 2012/04/21 14:48:50 (permalink)
Danny Danzi

   
Like for example Drew...say we really did massive experimenting on ARC and we find out it has so many flaws, it makes me wonder how I've gotten so lucky with it. LOL! Now, if those flaws or some scientific print out shows us the truth, yet I can't hear this truth and my mixes are sounding good, clients aren't complaining and everything seems to be in good shape over here, what did the science teach me if there's nothing I can hear?
 
And..what if the reason for me not hearing it is due to this particular problem not affecting me as greatly as it may someone else? See my point? If the science shows me things that are wrong yet I can't hear these things enough to where it's hurting me, how do I learn to hear them without being physically made aware as to what I should be listening for? Does that make sense at all? LOL!
 
Could we then apply that to ported monitors? If we can't hear what Mike Senior is telling us...which for sure he has some credibility to mention, and science shows us flaws with ported monitors that some of us may not hear, how or why would one worry about it? Can you see my point at all? This is where this stuff gets confusing to me to where I just throw my hands up in the air. Shouldn't we hear something wrong...or is it more you fix the something that is wrong that science provides and then you see if you can hear a difference for the better? If you're not having apparent problems to begin with and you just take the science as factual no matter what it pertains to, aren't we sort of searching for the sake of searching to where one could get totally involved with this to where it could actually deter them from getting anything done? LOL!!! These have always been my issues really. It's almost like people pry into this stuff "for the sake of".
 
I can totally see it if someone were having huge issues with ported monitors or any monitors really...or lack of room correction messing up their mixes etc. But if you don't have those problems and get good results, to me it seems a bit like science for the sake of science and just pretty much lab work, no?
 
-Danny

I think agree almost completely here Danny. The only thing is that it's possible that we might not hear things just because we don't know what to listen for and thus aren't paying to them. And maybe those things matter. 

But for something like ARC (or studio monitors) we don't care so much about any imperfections themselves as whether those imperfections are covering up something we do care about. And if, as seems to be the case, you're getting excellent results that translate well using ARC on your monitors in your room, and no one else who listens to the results is pointing out any problems...



But I don't think it hurts anything to know where problems might exist, what their magnitude is, and in what specific situations they might make more or less of a difference. Or whether something is real or might have been imagined.

But that doesn't mean everyone has to spend their lives looking for (or worrying about) "problems" that might be meaningless in the real world anyway either.


And if I personally ever suggest that something you're doing is "wrong" based on science/theory, I'd encourage you to ask me to prove it to you with a real world listening test - and using "real" audio and not some special case test signal. I should either be able to back it up or else back down.

 In order, then, to discover the limit of deepest tones, it is necessary not only to produce very violent agitations in the air but to give these the form of simple pendular vibrations. - Hermann von Helmholtz, predicting the role of the electric bassist in 1877.
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The Maillard Reaction
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Re:Ported nearfield monitors basically junk? 2012/04/21 14:55:12 (permalink)

So,

Is the idea that the there's some guy who can hear problems with every ported speaker?

Or is the idea that there's some guy who has found a speaker with a port problem?

best,
mike


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drewfx1
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Re:Ported nearfield monitors basically junk? 2012/04/21 15:24:08 (permalink)
I don't know. I didn't do my reading homework.

But I'm curious about the quantitative magnitude of the problem and what specific cases it applies to.

If something is a "big" problem only in some very specific cases, then that would matter to me a lot more if I was designing something to be used in any of a wide variety of circumstances than if I'm just a single user using it in a single environment in a very specific set of circumstances.

 In order, then, to discover the limit of deepest tones, it is necessary not only to produce very violent agitations in the air but to give these the form of simple pendular vibrations. - Hermann von Helmholtz, predicting the role of the electric bassist in 1877.
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droddey
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Re:Ported nearfield monitors basically junk? 2012/04/21 15:26:50 (permalink)
With room response, there's no requirement to guess. You can measure the performance at the listening position and know what the response is. Just get a measument mic and a simple, non-colored pre-amp (both inexpensive) and something like Ethan's stepped low frequency sweep SONAR project, and you can easily measure the response.

If you are in a fairly small, rectangular room, even if you have it fairly well treated, it can have significant deviations. If it's not treated, they can be huge. If you don't get the listening position into one of the least worst case places in the room (where the fewest nulls and cancellations at your room's resonances are at), then it'll be even worse.

I'm rearranging my room now, but in the previous configuration, even with a lot of trappage, I had a wicked cancellation centered around 67Hz. It wasn't very wide, but it was deep, and of course that is not an uncommon frequency for the low end of a kick drum, for instance. So I could have a kick drum just pounding like crazy and not hear it, and that frequency is low enough that sanity checking on headphones might not help either.  And, since it's a cancellation, something like ARC cannot do anything about it.

I think that my new arrangement will be naturally better in and of itself, then add the trappage back, but I won't know till I measure. I also moved a couple pretty big bookshelves in there and put them directly behind the listening position, with the books shelved pretty randomly wrt to depth/thickness, to help get some diffusion as well. I'll never be able to find the book I'm looking for, but it should make for a pretty good diffusor.
post edited by droddey - 2012/04/21 15:28:04

Dean Roddey
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#51
Danny Danzi
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Re:Ported nearfield monitors basically junk? 2012/04/21 15:44:47 (permalink)
Drew: Totally with you, Glad you understood where I was coming from..lol!

Dean, can't that 67 Hz cancellation be cured with an eq? Are you using anything at all to eq your monitors? If not, I believe ARC would help that issue. In my room, I heard nothing below 100 and was missing 500 Hz a bit as well which in turn, made me mix bass heavy and mid heavy all the time. ARC fixed that instantly for me even when I did corrections without my sub on. As a matter of fact, I don't even need my sub it helped me so much. The only thing I need the sub for is my NS-10's. But on everything else, the correction with no sub sounds exactly like the one I did WITH the sub. I just had to do corrections with and without the sub. It's exactly the same when I toggle them and turn off the sub at the same time. The NS-10's failed miserably though. ARC can't help them even a little bit. As a matter of fact, it made them sound worse for some reason. But add in the sub and do the correction, and they sound as good as anything else I own.

So maybe ARC is just eqing my monitors as the best case scenario and my rooms are in decent shape to where I'm not having any other issues? That's the only thing I can think of.

-Danny
post edited by Danny Danzi - 2012/04/21 15:50:08

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#52
The Maillard Reaction
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Re:Ported nearfield monitors basically junk? 2012/04/21 15:52:57 (permalink)

"Dean, can't that 67 Hz cancellation be cured with an eq?"

LOL


#53
Danny Danzi
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Re:Ported nearfield monitors basically junk? 2012/04/21 17:08:11 (permalink)
mike_mccue


"Dean, can't that 67 Hz cancellation be cured with an eq?"

LOL

Did I say something funny? Now do you guys see why I go off on this guy? I simply asked a question because I'm curious and am hoping to learn a little something here that I admit to knowing nothing about.
 
*shakes head* and you guys stick up for him...I just don't get it. Just like the other abortion of a thread...I wasn't even talking to him, yet again I get egged on. Keep pushing me Mike...just keep doing what you're doing to me..

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#54
spacealf
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Re:Ported nearfield monitors basically junk? 2012/04/21 17:10:29 (permalink)
Was Mike Senior talking about expensive speakers like this:
http://www.nolaspeakers.com/reviews/tas/EditorsChoice2007.html

Speakers like this perhaps which cost way less but still enough:
http://www.stereophile.com/floorloudspeakers/404aerial/#

or the Hoffman Iron Law whatever it is:
http://www.salksound.com/wp/?p=56

I guess low effeciency speakers and low response because of that is in, using more amp power to make up the difference. And here I thought if the excursion travel length of the speaker was really long, those small speakers could literally blow your head off. (well just a little humor at the end here.)


 
 
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gustabo
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Re:Ported nearfield monitors basically junk? 2012/04/21 17:43:51 (permalink)
My Adam A7X mons are some of the best sounding junk that I've ever owned!


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cliffsp8
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Re:Ported nearfield monitors basically junk? 2012/04/21 18:04:18 (permalink)
Mike Senior's book is full of useful and interesting tips and ideas. 

My take on the port issue is that according to SOS there appears to be something about some iconic monitors like NS10s and auratones that, though they have no bass response to speak of, give the mix engineer a picture of the mid range that is not available otherwise.

SOS has done a number of articles with history and investigations to support the notion that ported designs colour the low end by adding time domain problems around the resonant frequency of the port. A waterfall diagram of the monitor response can indicate problems of this kind.

The original article on the NS10 is worth a read and can be seen here:

http://www.soundonsound.com/sos/sep08/articles/yamahans10.htm

I have used the sock in the port trick - Alesis M1 mkII are unusable without a sock in each of the twin ports, preferably two :)   

My current monitors are venerable Event 20/20s with front facing ports (and no socks)  



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Re:Ported nearfield monitors basically junk? 2012/04/21 18:09:43 (permalink)
I think I'll stick with my KRK's and my melange of speakers...and throw in a hardware EQ in the bargain.... 

The space you have will always be exceeded in direct proportion to the amount of stuff you have...Thornton's Postulate.

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Re:Ported nearfield monitors basically junk? 2012/04/21 19:30:54 (permalink)

If you are serious about speakers without ports than you can try building a pair of "5.6" cabinets:



(44T x 18.75W x 14.75D inches or 1118 x 476 x 375 mm)

Each cabinet has one of these in it:



And nothing else.

info at: http://www.fostexspeakers.com/fostex.html

I look forward to building a pair someday. Single point speakers fascinate me.


best regards,
mike



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Jimbo21
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Re:Ported nearfield monitors basically junk? 2012/04/21 21:23:26 (permalink)
From reading a little further in Mike senior's book, I think his position is: Ported - North of $2000 for monitors and room treatment; check mix on various systems including headphones (recommends spending about $450-$500 for good ones), crummy computer speakers or boomboxes, auratone or avantone mix cubes (even just one in mono would be fine) to check the midrange and to see how the bass holds up here; room averaging, which means listening to the bass response in differing areas of the room, taking notes perhaps and if the bass is too loud in some places and too weak in others you may be close to the right amount, but if it is never too weak anywhere then you might want to cut it back a little; and also a spectrum analyzer.

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