开云体育

I own a SAE system that includes the following items - 8000, 2800,
2100L, 2200 and P500. I am also using a DBX 223 electronic
crossover. Before adding the crossover I was using the P500 as my
only amp. At that time the right channel was cutting in and out.
After adding the crossover the amp does not cut out however I have a
low hum from the speakers. Does anyone know what could be causing
the hum? I have checked all of the connections and they seem to be
fine. Does anyone have suggestions? Should I have the units
serviced? Any help would be appreciated...

Manuel

Dear Manuel,
The following things may be the cause of your troubles. Firstly, the cutting
out probably is due to an offset that may have developed and the relay
circuit is sensing this offset (DC). Also, there may be something definitely
wrong with the circuit which may be causing an asymmetry during
amplification which would surely produce the "effect" of dc at the output
which again would trigger the relay. As far as the hum is concerned, I
suspect that since you now have TWO amps in the system, you may have both of
them grounded through the 3rd wire ac plug. This is definitely a no-no with
multiple amps. Check this and if so, use 3 to 2 wire plugs (available in
almost every hardware store) to break the ground connections. Also, make
sure that NOTHING else is common grounded through the ac lines which can
cause ground loops.
Finally, as I've said many times, amps are like cars and refridgerators:they
get old and tired and need to be refurbished to bring them back to like new
condition. If you are interested, please contact me directly at my e-mail
which is <jamesbongiorno@.... I will then supply you with my
schedule.
James Bongiorno

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