I probably bought this mixer for a somewhat different purpose compared to most people. I have active speakers connected directly to my computer sound card, and my idea was to route the sound card speaker output through this little mixer so I could have a volume and sound control on my desk.
Physically the mini-mixer exceeded my expectations. It is compact and small, but sturdy and the knobs are quite nicely dampened. Its weight is also a lot above that of consumer USB sound cards.
The obtained sound quality is decent without noticeable noise and you can go to quite high volumes.
I am also very pleased to now have an accessible headphone socket (3.5mm) on my desk rather than behind it, with an independent volume control.
I haven't tried the XLR mic input yet, but for what I want I am actually very happy.
I took a couple of images of the hardware and put them on PicasaWeb: https://picasaweb.google.com/111743287730172647732/BehringerXenyx302USB.
The ICs used are:
- IC 1 AD 8602D Dual Rail-to-rail Input And Output Amplifier With Very Low Offset
- IC 2 TI PCM2902E Stereo Audio CODEC w/USB Interface, Single-Ended Analog Input/Output & S/PDIF
- IC 3,8,9,11,12,13,14 ST 062C eZ038 Low-power JFET dual operational amplifiers
- IC 4 1B3BH?
- IC 5 EH11A 019F42 Low dropout linear regulator
- IC 6 ST 064C EZ9A101 Low power JFET quad operational amplifier
- IC 7 4580R Low Noise Operational Amplifier
- IC 10 ST LM339 Low-power quad voltage comparator
How it shows up on Arch Linux with Kernel 3.14.4
usb 1-1: new full-speed USB device number 10 using uhci_hcd input: Burr-Brown from TI USB Audio CODEC as /devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1:1.3/0003:08BB:2902.0015/input/input48 hid-generic 0003:08BB:2902.0015: input,hidraw4: USB HID v1.00 Device [Burr-Brown from TI USB Audio CODEC ] on usb-0000:00:1d.0-1/input3 usbcore: registered new interface driver snd-usb-audio
USB Mixer: usb_id=0x08bb2902, ctrlif=0, ctlerr=0 Card: Burr-Brown from TI USB Audio CODEC at usb-0000:00:1d.0-1, full speed Unit: 3 Control: name="PCM Playback Volume", index=0 Info: id=3, control=2, cmask=0x3, channels=2, type="S16" Volume: min=-32768, max=0, dBmin=-12800, dBmax=0 Unit: 3 Control: name="PCM Playback Switch", index=0 Info: id=3, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN" Volume: min=0, max=1, dBmin=0, dBmax=0