My Buffalo 32S/Volumite/LCDPS/LCBPS/Toslink I built in 2009 has been great, used with HD800's wired balanced.
I recently got Westone W30 IEMs to use in bed (sleep on my side).
The Westones are much more sensitive than HD800's, so any noise is very noticeable.
Wired single-ended, I get a hum in left channel.
Rewired the IEMs balanced, & hum becomes a "crackle" in left channel only, very faint, but there.
Volume of noise constant at any Volumite setting, or even with Volumite disconnected.
Changing from Toslink to coax, or even no input, still there.
Tried probing components & the board itself with insulated probe, resoldering some, no indication of source and no better.
Tried running analog section on +-13V LiFePO4 batteries, noise still there.
Originally thought noise went after warmup, but just goes fainter then comes back.
I have run the IEMs on B-II DAC, no noise, so its not them.
Was going to use B32 as DC-powered travel DAC with IEMs, but noise is too annoying.
Can anyone please help me identify which component(s) on B32S board might cause this noise?

Thanks in advance...

Edited by user Monday, December 1, 2014 12:13:46 PM(UTC)  | Reason: Reworded for clarity

Yes Brian, very very faint when b32 used with standard 4v rms balanced output.
Before your posting I had decided to install 4 x 2k ohm matched resistors as per manual to reduce output to same as b-II (also so Volumite had adjustment range for IEMs). Hd800s still loud enough for my tastes at that output, & makes comparisons with b-II easier.
Noise in left still there with IEMs, but can't hear through hd800s anymore.
Noise is more like a variable-volume white-noise than a crackle. Varies a bit in volume over time, but independant of volumite level or source paused or playing.
Even tried Toslink module from b-II in b32 - no effect on noise.
Hooked b32 to home amp/speakers instead of b-II (which is absolutely noise-free btw), connected single-ended to amp.
With amp cranked up I can here very faint white noise in left tweeter that's not in right channel.
Interesting it's not a hum as was the case with IEMs single-ended.
Rarely listen to speakers at that volume setting, so would never have noticed if I wasn't listening for it.
But b32 with IEMs when music goes quiet it's there.
For the moment b32 is running amp/speakers with no noticeable noise at normal levels, so I can use b-II in bed with IEMs.
IEMs 30 ohm, 107dB @1mW. Hd800s 300 ohm.
Difference in Volumite setting near minimum vs at maximum.

It could be that the output stage in the B32 does not like that load - you could try adding a small series resistor to the output of the B32 and see if that solves the issue with your IEM. If it does not you may have a AVCC op-amp going south - but that is just a guess.

I learned a ton between the B32 and The BIII-SE you won't be disappointed if you go that route. :) I use B3SE/IVY-III (I use this most of the time because I have wired most of my IEMs/cans for balanced use) with several IEMs and my collection of cans from 8Ohm to 600Ohm. If you use strictly SE output the legato with its hefty output buffer on the SE output is a solid choice too. :)