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Given the heat/cold cycles of the storage area along with humidity, I would first suspect poor solder connections. This is not unusual for units of this age. A general overhaul should restore this to operation. This should be a labor only repair unless the output STK is bad. These units are known for having poor connections at the voltage regulators which cause a DC voltage offset triggering the protection circuit. The overhaul should address this as well.
to wire up your sub in mono bridged mode it's either L+ and R- or L- and R+ it should say this on the body of the amp in front of the speaker terminals. If it does'nt i would check to see if your amp is bridgeable if it is not i would advise against it as this could damage the amp.Hope this is helpful
If you only have 3 (8 Ohm) Speakers and want to hook them all up, you will need to balance the impedance of the sides or you will be too loud on one side and not loud enough on the other. This will cause your amp to work harder on one side. (Not Good) I did not see the speaker A and B in the instruction manual. Because of that, I will state the following. I would not recommend that you hook up anything that is unbalanced. I would use just a pair in two channel mode (This would give you an 8 Ohm load on each output). The manufacture recommends a 4 Ohm load for the best output of this amp. But the most important thing to remember is that your speakers must be able to handle this much power or the speakers will be permanently damaged. This amp has Protection to cover: Full short circuits, Open Circuits, Thermal and HF protection, and stable into reactive or mismatched loads. You could hook up all three speakers and the amp will work, but, I would not recommend that type of hook-up. I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread. If I have managed to answer your questions and have helped you, please help me, and rate this suggestion the highest FixYa rating. If you cannot give this post a “FIXYA” (Two Thumbs Up) rating then please comment to this post and I will try to help you further. I try to provide the best FixYa experience.
You'll need to use one of the four stereo inputs on the mixer and make sure you wire the speakers separately to channels one and two of the amplifiers. Assuming both of your amps are xti series amps, that's all you have to do.
A home stereo system is not complete without an amplifier which drives the speakers. A preamp cannot drive a speaker. Try to read the labels at the back of the system...if it reads speaker then that is the amplifier output. Would you mind giving us what model is your system?
The user manual for this amp has good instruction on how to connect it. You can download a copy from here.
Page 9 has info about using the amp for "bi-amping" The amp is only a stereo unit, so to do a 3-way system, you will need at least 1 amp mono in bridge mode for lows, and other stereo amp for mods, and another stereo amp for highs. You could use the internal low pass filter for the bottom end, and a 2 way crossover for the mids and highs. Much simpler doing a 2 way system with composite bins for mids and highs, and subs for lows. You only need the 2 amps and use the low and high pass filters inside the EP2500. If you need anymore help on this, I am happy to talk to you more.