I am trying find out if mine is broken or if ALL Quad-Captures have this fault.
Please try this when you have a moment:
 
Turn HI-Z (INPUT 1) on the rear of the device ON. (VERY IMPORTANT)
Turn SENS 1L up to about 3 o'clock. At least one segment lights.
Turn MIX to INPUT
Turn OUTPUT to 12 o'clock.
 
Plug in headphones and on mine I hear a kind of mains buzzing.
This happens on both my laptops, regardless of whether I am running off mains or batteries.
It even happens when I put a short-circuited jack in INPUT 1L !!!
 
This does NOT happen on my Edirol UA-25EX nor on my UA-101. As I turn sensitivity up on those, I get more hiss but no buzzing.
 
I am trying to decide whether I should ask for an exchange or just get my money back and look for a different model.

JazzSinger


I am trying find out if mine is broken or if ALL Quad-Captures have this fault.
Please try this when you have a moment:
 
Turn HI-Z (INPUT 1) on the rear of the device ON. (VERY IMPORTANT)
Turn SENS 1L up to about 3 o'clock. At least one segment lights.
Turn MIX to INPUT
Turn OUTPUT to 12 o'clock.
 
Plug in headphones and on mine I hear a kind of mains buzzing.
This happens on both my laptops, regardless of whether I am running off mains or batteries.
It even happens when I put a short-circuited jack in INPUT 1L !!!
 
This does NOT happen on my Edirol UA-25EX nor on my UA-101. As I turn sensitivity up on those, I get more hiss but no buzzing.
 
I am trying to decide whether I should ask for an exchange or just get my money back and look for a different model.

Verified. I get the same buzzing. A slight pop just before 3 o'clock and then solid buzz. Strange. 

Edit: I get the same behavior with knob set to playback, it's not as loud but there's that small click and solid buzz just before 3 o'clock... Lame.

Ah. I thought the pops were from a scratchy pot on mine.
Apparently not. Thanks for the additional info.
 
Methinks,  back it goes.

JazzSinger


Ah. I thought the pops were from a scratchy pot on mine.
Apparently not. Thanks for the additional info.
 
Methinks,  back it goes. 

Glad I could help.. and thanks because now I am aware of this.
I hope this is something that can be rectified with a firmware update because I can't send mine back.

Just to test, I decided to turn off Hi-Z mode. Input one sounds fine. It's smooth all the way up to max input level. Input 2 however has two points where it clicks.. One at about 11 o'clock and another at about 2 o'clock... I guess it's not really a pop/click sound like with the Hi-Z setting.. It's more like a static burst.. 

Bummer.

BUMP

Can anyone else who has a Quad Capture take a few minutes and test out the steps the OP wrote. It'd be nice to have a little more verification as to whether or not this is a widespread issue.

Thanks

deleted

Ok, The OCD in me has more details to share:

#1. Turn Hi-Z On
#2. Go to the Quad Capture Software Panel
#3. Turn up the Sens Knob for preamp one (in software)
#4. When the knob hits 42, listen and/or watch for a pop/click. The meter will jump. After listening closer, I can hear the buzz sound before reaching 42 on the dial so I think that's just the normal noise of the preamp when it's in Hi-Z mode. It's just strange that it seems to abruptly boost up at 42 along with a pop/click.

Also, after messing around I noticed that there are pops/clicks on both preamps at the exact same spots in both Hi-Z and Mic/Line mode (Although you'll need to crank it up pretty loud to hear it in Mic/Line mode) Anyway, the spots on both dials are: 16, 29, 42...

Well.. That was fun. In conclusion, I believe this is probably just a hardware quirk that all quad captures have. 

Anyway, I hope this has been educational. I'm going to get back to making music now.  :)

Yes I'm getting a great deal of noise when I'm cranked full up (two segments) worth on the LED meter.

But then again if there was something you plugged that needed anywhere near that much gain you wouldn't be using a Hi-Z input.  I can even hear my mousewheel polling the motherboard at that level...lol.

The signal to noise ratio of something that needs a Hi-Z input is good within the range of control you'd actually be using it at, I wouldn't worry about it, to me it's working as expected.

It likely that is merely that the range of control is less on your previous interface being the difference between hearing it here and not before.

I cannot record my MIM Fender Jazz nor my single-coil Epiphone Casino without some background buzzing on the track. Slow blues numbers are proving to be a particular problem.

My old Edirol UA-101 and Cakewalk UA-25EX work fine with both instruments, so it's not due to the different gain ranges.

Those segments do NOT indicate gain. They indicate input signal level. Those two segments you are seeing is the buzzing, so yours does it too. We are clearly seeing a general problem.