Speaker output very high

Definitely need more info - such as type of amplifier or receiver, how many speakers you are running, whether the subwoofer is powered or not.
As a simple test procedure: Disconnect all speakers and plug in a pair of headphones. Get a strong audio signal? Good, move on. No signal or week signal, you have an amplifier issue before the audio even gets to the speakers.
Next: Disconnect all speakers, turn the volume down, and connect one speaker to the left output channel. Slowly increase the volume. If that works, do the same on the right channel. Everything OK? You're putting out enough gain on both channels. Sometimes one channel goes bad. You can still listen to your sound in mono moder, or drive two speakers from the single working output. Not stereo, but dual mono. Move on.
Connect left and right speakers but not the subwoofer. Repeat the test. Whatever is left is probably the problem. If the subwoofer is powered, check the power supply or incoming voltage. If the other speakers are driven off the subwoofer or powered from there, that's likely the problem.

It sounds like you are over driving the speakers. Recommend reducing PC audio output, as it is amplified for the computer speakers. Use the amplifier for volume - not the PC.

could possibly be the volume switch, try changing the switch with one that you hardly use to eliminate the problem. any further probs just let me know. hope this helps

The easiest thing to do would be to put high wattage level controls at your speakers
Parts express sell them and MCM electronics

this may be due to the fault that the output is overheating and exceeding the currrent limit set on the fuse . Hence the fuse is blowing off. If the amp is working normal after it coold off and after replacement of the fuse, then the overloading of the output needs to be checked.check the rating of the speakers. Do not use the amp inside a closed cabinet. If possible use a good ventillation , a fan and try out if the amp works fine. If so check if the soruce is producing any distortions to thermally run the outputs. reduce volume level , and check the heating. once you have located the problem of the heat proceed to isolate the section. helpful? Good day

Your D-SERIES amplifier was designed to operate efficiently at loads down to 2 Ohms.
This means that you can install four 8 Ohm speakers per channel when using parallel wiring.
of an additional 10W to each speaker.
Please note: The gain control of any car audio amplifier should not be mistaken for a volume
control. It is a sophisticated device, designed to match the output level of your audio source unit to
the input level of the amplifier . Do not adjust this input level to maximum unless your input level
requires it. Ignoring these instructions will result in an input overload to the amplifier, and excessive
2 Ohm Operation
front panel will be illuminated, indicating the amplifier has gone into a self-preservation mode.
these conditions before attempting to power up the amplifier again.
When operating at 2 Ohms, the amplifiers will increase their output power by approximately 50%. The
current draw will so increase by about the same amount, also be sure you have enough current to
run the amplifiers into a 2 Ohm load. If you lack adequate current, your music reproduction will be
distorted.
Increasing the number of woofers per channel at low frequencies (up to 100MHz) produces an acoustic
coupling effect. This acoustic coupling increases your power output by 3 dB per speaker, or the equivalent
audio distortion. It can also cause the protection circuit to engage.

HI...
Connect the "line-out" of the sound card to the "Line-in" of the GEM amp

Feed the amp with the left channel preamp to the right channel input on amp and check output. If you get output from amp then pre amp nedds to be checked out if still no output then amp is suspect. Randy

dear sir,pls check the HT voltage fuse, LTsupplay also and out put stage,and volume controle,

Strange problem. If you have moved the equipment carefully, reconnected all cables and inputs properly in the right sockets and terminals, i don't see any reason why the amplifioer should not work. And if Power is Ok, Amp should work. Pls recheck all connections properly once again.