Well I do not know what your knowlage of amps is but take an ohm meter and check all your Cap's that sit on the output stage of your Power Ic's. The noice your are getting is ripple from the AC side. When you switch of the amp there is no power and no ripple so all you here is the correct DC power that is going thru to your Power Ic's. that power is supplied by the Cap's that is busy discharging. You will find your problem there.
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Without knowing what make and model of the gear you're looking to connect, I can't give you a definitive answer. However, in general, if you have a powered PA mixer, meaning it has both a mixer section and a power amp section in a single box, the main speaker outputs will be on the rear panel of the box and marked as such. There will also be a jack for monitors, but some mixers have an amp for monitors, some just have an output for the monitor mix, but not an amp for them, and on some you can switch the main outputs to feed either a Left and a Right speaker, or a front mono speaker and a montior speaker. Instruments will go into the individual channel inputs.
it is possible that the PA speaker output is intended for a normal (unpowered, unamplified) speaker. Perhaps in your case the audio you hear from the PA speaker is only signal leakage from the PA Speaker connection.
To know.. connect a regular speaker to the PA speaker connector (any speaker, home audio, old car 6x9....). If the PA works and drives the temporary speaker OK, and you hear no CB receive, then the PA output is for a normal speaker, with leakage of CB audio.
It is just a guess, but easy to try.
it is load resistance. set the amplifier switch to the resistance ( X amount ohms) to match your speakers. Although running 4 ohm speakers at the 8 ohm setting is louder, it will hurt your amp
most home/semi pro speakers are 8 ohm, while car speakers are 4 ohm. If you are doing a multi speaker pa/intercom install use your formula to calculate total load is 2 8 ohm speakers in parallel are four ohms . express them as fractions and add the denominator ie:8/1 +8/1 = 8/2 or 4/1 or 4. now connect that in series (add the top numbers)with another 2 speakers in parallel and you get back to 8 ohm load. repeat the same process over and over and you can hook up to 32 speakers to the amp without needing the 70 volt tap. hope this helped.
You have to check the ohms of the speakers all spekers should be 8 Ohms or above. if not it will overload the amplifier at high level. The minium ohms impedence of the amplifier is 4 ohms. If you connect two 8 ohms speakers together then the effective ohms will be 4 OHMS then the amp will handle the speakers. If you connect two 4 ohms spekers together then the effective ohms will be 2 Ohms, this will overload the amplifier. You will be able to connect two 8 ohms speaker to left channel or right channel of the amplifier. Check the speaker spesifiction to know its ohms. Make sure all the speakers have an impedence of 8 OHMS or above