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connecting a analogue mic pre through a/d converters
Old 21st November 2009
Here for the gear
🎧 10 years
connecting a analogue mic pre through a/d converters


I have got a jlm baby animal analogue 2 channel mic pre and I have to run it through my behringer ada8000 converters to my Rme soundcard. I am guessing the best way to hook this up is balanced xlr out of the outputs of the jlm pre into the line in on the front of the ada8000 (so it may bypass the behringer mic pre's).

Would I be best to go balanced xlr out into balanced trs line in or to unbalanced ts line in on the ada8000 for best conversion and sound quality?
I will mainly be using this pre for guitars.

Old 21st November 2009
Gear Guru
Karloff70's Avatar
🎧 10 years
Whatever you do, you'll go through the pre.....so just turn it down on the front (=no added behringer gain) and go balanced to balanced
Old 21st November 2009 | Show parent
Lives for gear
🎧 10 years
to bypass mic pre in each channel:

remove 47uf caps out of circuit , replace them with wire,
remove 6.8k Resistors, remove 1.3k resistors, remove 825 ohm resistors,
remove 2.49k resistors, remove surface mount diodes, remove surface mount transistors, remove 1316 transistors and install a wire (connect them together) where the base and collector juntion was solder.

walla, bypass mic pre with signal/clip lights

if you don't care about the lights:

(be sure to double check signal lines with an ohm meter, they should point back to a 510 ohm resistor solder on the board (pin-in-hole type))

remove front board and discard,

install xlr jack in front panel,
remove black wire from channel plug, solder it to pin 1

solder in a 510 ohm resistor on pin 2 and connect the other side of the resistor to the first red wire that was right next to the black wire

solder a 510 ohm resistor on pin 3 and connect the other side of the resistor to the red wire right next to the other wire that you detach for pin 2

basically the channel connector is pin out as 1-gnd (black); 2-Signal + (Red); 3-signal - (Red); 4-channel status (red)

the 510 ohms are a must and recommended by Alesis/Wavefront Semiconductor that made the A/D converter chip.

I posted a schematic in this thread:
see: https://gearspace.com/board/low-end-...converter.html
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