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project Idea

Former Member

Hey Ben,

my name is Matt and I work in my churches soundbooth and we have a problem that you might beable to help with we have a sound board and 2difrent amp racks one below the sound board and the other behind the praise band, all need to be turned off in a certain order to keep from poping the speakers. what we need is one switch to cause the system to shutdown in the proper sequence.

 

Thanks,

Matt

  • I am going to assume you have to turn the power amp ON last, and OFF first, to avoid the pop sound? This is a standard practice with amps and speakers. Do you have a warm up phase too? (about 5 minutes)

     

    What is happening, if you do not turn it off/on in that sequence, is the amp is dumping all transient power into the speaker. I know a few people who have similar setup in their cars. They place a special diode inline with the turn-on lead, and pit a large capacitor in parallel with their speaker.

     

    The capacitor has to charge up first before letting power through, and avoids the pop. In other words, you are adding a filter to the design.

     

     

    Another option is adding a snubber capacitor across all the switches. Similar to the above option, you are adding more filtering caps. This helps smooth out the signals.

     

    As for the values or parts I am suggesting, I will have to look into it. I would start at any automobile sound system place. You could even go to the audio section of any Best Buy. They have the filtering capacitors for cars and home stereo systems.

     

    Good luck.

     

    Cabe

  • Cabe,

     

    I also work for a church and theater group and ran into the same issue you are listing. The problem can be solved with an off the shelf power sequencer. Take a look at the Furman RS-1 and the Furman MP-15. These can be setup pretty quick. These allow for delay'd on and delay'd off, with a 3 sec (usually enough) delay between stations. In your case, you could do this with two of the MP-15s and one RS-1 all for under $250.