Greetings! Ok, your amp has an XLR (3-prong) Low-Impedance input on Channel 1 for a Mic. All the other inputs are 1/4" High Impedance inputs, which are for instruments and/or other High Impedance items including low quality High Impedance Microphones. The SM48S is a high quality Low Impedance microphone, so if you use it with a 1/4" plug, it will be in a High Impedance channel, and will be very LOW in volume in comparison with everything else. So, you must use an XLR (3 prong) cable from the Mic to the Channel 1 input on your amp. That will do the trick. Good Luck with your new amp and Mic!
SOURCE: Does anybody have a schematic for the Behringer
Look at this one:
http://elektrotanya.com/behringer_k1800fx_sch.pdf/download.html
This is for the 1800 however...
Often they will just double up with two amps, one inverted, and use in bridged mode.at the higher power in what we call an "H" arrangement.
Since the drains are tied together, the heatsinks MIGHT be hot output level.
SOURCE: I have a Behringer 1202fx
Personally I would run the RCA outputs to the RCA in on the APS.
If you insist on using XLR from the APS to the board (like through a snake etc) I would higly recommend using XLR to 1/4" adapters. These things have wonderful little transformers in them (yes, wire wound transformers) that do the 1/4" to XLR conversion really nicely so that you can run your signal through the snake or just so that you don't get the hum and distortion that can be associated with unbalanced signal transfer.
You want a HI-Z unbalanced to LO-Z balanced adapter.
Not always easy to find, but if you absolutely cannot locate any, I have a couple in stock.
I suggest you look around though, because mine aren't cheap!
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SOURCE: I own a Behringer Ultratone
This is most LIKELY an electronic problem... possibly in the final power amp. Repair may be a simple failed component or a mass number that fail like a stack of dominos. Take it to a shop for repair.
SOURCE: I have two Behringer Eurolive
This is alimentation fault of the amplifier inside the box. Dismount the amplifier block and take a look first if there are some burned pieces. If it seems all ok, better bring it to a electronics/ tv service center.
SOURCE: My Behringer mixer Eurorack UB802
Here's the manual. page 8 Good Luck!
http://ec1.images-amazon.com/media/i3d/01/A/man-migrate/MANUAL000064843.pdf
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