Helpful Reply(UPDATED!) USB extension cord (extra long) to connect audio interface to computer?

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vaultwit
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/10/31 10:19:28 (permalink)
So for this idea, I had made the assumption that the lack of power through the overly long USB extension cable was the only potential issue. I thought that as long as the audio interface was receiving sufficient power (either with the interface's native ac adapter or, in my case, a powered hub), transfer of audio via the USB extension wouldn't be a problem. Am I wrong to think that USB is an "either it works or it doesn't" type of cable as far as data transfer (not power transfer)? Similar to DVI compared to VGA

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#31
Beepster
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/10/31 11:42:09 (permalink)
As was mentioned you might get latency and/or drop outs. Just give it a shot and see what happens. It's not gonna hurt anything.
#32
HighestOlive
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/10/31 12:05:33 (permalink)
One thing that hasn't been mentioned here but that I have read about in other places is USB over Cat5.  I think I have seen claims of using USB devices over 100 ft away when doing this.  Just do a quick google search it my answer some questions for you.
#33
Cactus Music
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/10/31 12:25:51 (permalink)
OK So many warnings here about the fact that long USB cables will probably not work and if latency is involved that's a huge danger, you might not even notice if it's minor, but who wants latency in their recordings. After reading the warnings I wouldn't even try it. 

I like the idea of a second monitor. I already use a wireless mouse and keyboard for vocals. I'm not in a closet,  but I move back 15 ' away from the DAW just to remove the little bit of fan noise. But I find it hard to position the mouse from that distance so I like the idea of having a monitor close at hand. 
Either that or I'm going with the 38" TV. 


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#34
jm24
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/10/31 13:50:36 (permalink)
At least put the hub in the middle of the chain, with the usb cables on each side, rather than connected together.
#35
jm24
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/10/31 13:54:05 (permalink)

I use a 5 foot USB extension for the mouse adapter to position it on the table. Works way better than on the back of the computer.
#36
vaultwit
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/10/31 13:55:30 (permalink)
jm24


At least put the hub in the middle of the chain, with the usb cables on each side, rather than connected together.

Yeah what I meant was: audio interface > USB cable > powered hub > USB extension > computer.


Is that what you mean?

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#37
soens
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/10/31 20:51:25 (permalink)
That's exactly how mine is set up. That way the hub gives the USB a JOLT of extra power before reaching the interface.
 
The hub allows me to use everytning USB with 2 different computers.
 
Some say hubs aren't good to use but mine works pretty well. Still, the shorter the distance for any cord the better.
 
 
Steve
#38
bitman
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/10/31 21:41:47 (permalink)
I bought a 40' powered usb ext, cable some years back.

They do exist,
#39
jm24
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/10/31 23:34:50 (permalink)
some devices require a direct connection

some do not
#40
Cactus Music
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/01 11:14:56 (permalink)
What I'd want to do is run a latency test once this was set up. Just for piece of mind. 
The test:
Take a kick drum track. or anything with clear transient spikes. solo it.  
Run it out the output of the interface and back to an input using a short patch cable. 
Arm a new track , turn off input echo, and re- record a section of the track. 
Zoom in on the transients and use the grid lines to see if it had fallen behind. 


Johnny V  
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#41
Jim Roseberry
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/01 12:28:06 (permalink)
The USB cable length limitation is not some arbitrary value, but is based on real-world physics that you can't get around.



Absolutely...
I've got a couple keyboards that connect via USB.
Go beyond 15' with the cable... and they sometimes don't work. (aka unreliable)
I've also seen this with the RME Babyface.  It's a great unit... but unreliable when connected with a long USB cable.


Best Regards,

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#42
vaultwit
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/07 20:30:44 (permalink)

UPDATE:

So I received my extra long VGA and USB cables today from Amazon, and set everything up. WORKS BEAUTIFULLY!

My setup: interface -> powered USB hub -> 32 ft USB extension -> desktop. Absolutely zero latency, delay, dropouts, crackles, pops, nothing. Just a perfect recording booth.

For those who want to gives this a try, this is my USB extension cable, and this is my VGA cable. Please note that my Audio Interface is a light and portable Focusrite Scarlett 2i2, so this may not work for a more power-heavy interface. Good luck!

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#43
gswitz
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/07 20:36:15 (permalink)
My parents have an expensive audio interface for listening purposes only. They had me snake one of those 32 foot cords (gosh it was long) around their bedroom to the stereo where the interface lives so they could lay in bed and listen to their 24 bit flacs while surfing the WWW. It has worked fine for them. I can tell you it works, but latency wouldn't matter much to them.
#44
SuperG
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/07 20:40:07 (permalink)
According to wikipedia, the maximum length for USB 2.0 is 5 meters, and that sounds about right. The reason for this is that the max timeout for a command reply is 1.5us, and the cable should be no more than 26ns total. You're looking at a max of 15 feet.
#45
vaultwit
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/07 20:54:12 (permalink)
SuperG


According to wikipedia, the maximum length for USB 2.0 is 5 meters, and that sounds about right. The reason for this is that the max timeout for a command reply is 1.5us, and the cable should be no more than 26ns total. You're looking at a max of 15 feet.

All I know is it works. Quality is great, with my latency set to 2ms. I even did a test recording where I recorded to the beat of SONAR's metronome, and everything was perfectly on beat. Good in my book.

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#46
gbarrett
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/07 22:13:33 (permalink)
For remote setups like this I use Splashtop Streamer on my studio computer and the Splashtop app on my iPad. I can control everything that I need to in the quiet room. Simple, cheap, and totally cool!

A real musician knows the difference between the music and the notes.
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SuperG
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/08 03:41:50 (permalink)
vaultwit


SuperG


According to wikipedia, the maximum length for USB 2.0 is 5 meters, and that sounds about right. The reason for this is that the max timeout for a command reply is 1.5us, and the cable should be no more than 26ns total. You're looking at a max of 15 feet.

All I know is it works. Quality is great, with my latency set to 2ms. I even did a test recording where I recorded to the beat of SONAR's metronome, and everything was perfectly on beat. Good in my book.

It usually does - engineers always design beyond specification. The latency specified for USB has little to do with what is commonly tossed about here. There, latency refers to the processing delay caused by sample processing itself With USB (as in ethernet) it refers to the maximum time a client must wait before response - and the times are so short that the very length of the cable becomes a significant factor. Still, if you look at the numbers, cable delay is specified in nanoseconds. The delay you're using is all due to processing - the cable is simply insignificant.


#48
eikelbijter
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/08 17:18:54 (permalink)
  As per the description of the item: "- Devices with precise timing requirements (such as USB cameras) not recommended"...this USB cable is an active repeater, which is like a hub. It'll work, but might introduce timing errors in the recorded audio, jitter.....

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#49
Beepster
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/08 18:09:51 (permalink)
Yeah, really. If it works it works. No need to speculate beyond that (although it is kind of fun and interesting). That's why I kept saying just try it. I've done TONS of things in my life music related and otherwise that you probably SHOULDN'T do but they ended up providing the end result I wanted. That really is all that matters. 

That said I'd be vigilant in keeping a close eye and ear on the waves for minute dropouts and the like just in case. It sucks thinking you've gotten something tracked perfectly then when trying to mix you hear an imperfection and have to shift gears and do it over again.

Cheers.
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gswitz
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/08 19:05:03 (permalink)
Can I speculate? Perhaps the 32 foot cord is doubling the spec with the repeater end. That end is special and lights up. I think it uses power from the nearest USB device to strengthen the signal. It is interesting that it is almost precisely double spec, isn't it? Everyone says 15-16 feet is the limit, but this cord is exactly twice. And you get more than the 32 feet b/c you plug yet another USB cord into the end of the first.
#51
vaultwit
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Re:USB extension cord (extra long) to connect audio interface to computer? 2012/11/09 08:36:45 (permalink)
Beepster


Yeah, really. If it works it works. No need to speculate beyond that (although it is kind of fun and interesting). That's why I kept saying just try it. I've done TONS of things in my life music related and otherwise that you probably SHOULDN'T do but they ended up providing the end result I wanted. That really is all that matters. 

That said I'd be vigilant in keeping a close eye and ear on the waves for minute dropouts and the like just in case. It sucks thinking you've gotten something tracked perfectly then when trying to mix you hear an imperfection and have to shift gears and do it over again.

Cheers.

Yeah I'm just glad it works and I'm excited about being able to use this setup. I actually did a full vocal recording session last night, and assembled all the takes afterwards and didn't notice a single artifact or imperfection while examining the takes. Whew! Although I agree and will be paying closing attention in the future though.

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