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  1. #1

    is this hooked up right

    we are running a QSC 3102 Amp to 4 Peavey SP2's Amps settings are--Input config-Bridge--CH1 Full, CH2 Full andthe clip limmiter is on,Speaker input, wattage ect. 1200 W peak, 600 W Program, 300 W RMS (49v RMS) inputs= Normal Full Range and BI Amp Hi-Low and we are running MONO running out of amp and into the Full Range of the top 2 speakers and then jumpong fom the tops to the bottoms. reason im asking is we have been running it this way for Quite a while, but the last gig we blew 2 of the horns ther was an incodent the gig be for that, 1 of the 15's were broke and we got another one but it was the wrong one so we found an old 200 Watt radio shack 15 and put it in, but it didn.t last but 2 songs then we had to unplug that speaker, is this what caused those horns to blow???

  2. #2
    Your input is Bridged to get your signal to both sides of the amp, good. You are running two cabs per side, good.... Just don't run 4 cabs off the bridged output. ....

    How is the rest of your signal chain doing? any peaks in the signal early on? Your limiter should act as a good buffer, but if you are constantly running a hot (too hot) signal into the amp, it could be pushing too hard.

    May have just been their time to go. How loud and how long are these boxes normally i use like this?

    Nothing wrong with your setup, as far as I can tell.

  3. #3
    Quote
    Quote: Project-R
    View Post
    we are running a QSC 3102 Amp to 4 Peavey SP2's Amps settings are--Input config-Bridge--CH1 Full, CH2 Full andthe clip limmiter is on,Speaker input, wattage ect. 1200 W peak, 600 W Program, 300 W RMS (49v RMS) inputs= Normal Full Range and BI Amp Hi-Low and we are running MONO running out of amp and into the Full Range of the top 2 speakers and then jumpong fom the tops to the bottoms. reason im asking is we have been running it this way for Quite a while, but the last gig we blew 2 of the horns ther was an incodent the gig be for that, 1 of the 15's were broke and we got another one but it was the wrong one so we found an old 200 Watt radio shack 15 and put it in, but it didn.t last but 2 songs then we had to unplug that speaker, is this what caused those horns to blow???
    aside from the problems you are having with the speakers the first thing you want to do is to forget about bridging the amplifer altogether. will it work this way yes but it is not a good idea. what you should do is run a pair off of one side and the other pair off the other side. if you have only one input to feed the amp there is a paralell input option in the dip switches that will send signal to both channels 1 and 2. that will solve the problem of the amplifier being pushed to its limits all the time from an impedance standpoint. if you are finding that your amplifer is constantly clipping than what you need to do is get another amp or find another way to minimize this. even with the clip limiter on it is not a good idea to live in the red. The most common cause of speaker malfuncion is a clipping amplifier no matter how good it is. The second would be sustained feedback which is possible what may have taken out your horns. It is possible that they also may have just been pushed too hard which may have seperated the coil from the diaphragm or just shattered it all together, or burned the voicecoil but usualy they wouldnt fail in pairs naturally, it would have had to be caused by an incidence of either the things I have spoke about. you may also check the crossover, some of those peavey boxes have a high frequency protection bulb that may have blown and possibly saved the driver.. as to what may have caused them to be damaged as a possibity from the incidence with a low driver it would more likely be because they were probably pushed too hard to compensate for the lack of that driver being audibly present and less likely to because of the driver being a dead short and causing the amp to sustain a clipping level and causing dc to daqmage the hf drivers.
    You should look into replacement baskets for the 15" drivers if they are black widdow or scorpion, you can actually keep spare baskets with you as they are field replaceable...... hope that helps

  4. #4
    Quote
    Quote: peter miller
    View Post
    aside from the problems you are having with the speakers the first thing you want to do is to forget about bridging the amplifer altogether. will it work this way yes but it is not a good idea. what you should do is run a pair off of one side and the other pair off the other side. if you have only one input to feed the amp there is a paralell input option in the dip switches that will send signal to both channels 1 and 2. that will solve the problem of the amplifier being pushed to its limits all the time from an impedance standpoint. if you are finding that your amplifer is constantly clipping than what you need to do is get another amp or find another way to minimize this. even with the clip limiter on it is not a good idea to live in the red. The most common cause of speaker malfuncion is a clipping amplifier no matter how good it is. The second would be sustained feedback which is possible what may have taken out your horns. It is possible that they also may have just been pushed too hard which may have seperated the coil from the diaphragm or just shattered it all together, or burned the voicecoil but usualy they wouldnt fail in pairs naturally, it would have had to be caused by an incidence of either the things I have spoke about. you may also check the crossover, some of those peavey boxes have a high frequency protection bulb that may have blown and possibly saved the driver.. as to what may have caused them to be damaged as a possibity from the incidence with a low driver it would more likely be because they were probably pushed too hard to compensate for the lack of that driver being audibly present and less likely to because of the driver being a dead short and causing the amp to sustain a clipping level and causing dc to daqmage the hf drivers.
    You should look into replacement baskets for the 15" drivers if they are black widdow or scorpion, you can actually keep spare baskets with you as they are field replaceable...... hope that helps
    From looking at the pictures of his amp before responding, I saw that the input was bridged. this does not bridge the output, just gives you the same input signal to both sides.

    He is running two cabs off each side, which is fine.

    Most common cause of destruction of speakers is lack of understanding how to run your signal chain and lack of understanding of how much power you need for a certain speaker.

    Highly debated. make sure your signal has no clipping/distortion and give the speaker the same, or less, power that it is rated at, and you should be happy and safe. If you need more volume, get another amp and more speakers...

  5. #5
    Ok, just re-read the original post.

    You are running to the tops and then to the bottoms? If your subs have a built-in crossover, you would want to run into the subs first, then take the mids and highs to your tops.

    If you have subs without internal crossovers, you should be running your mixer output to a crossover and run the lows to one side of your amp and the mids/highs to the other.

    Daisy-chain the speakers. (Run the sub amp output to one speaker and from that subs other speaker jack, run the other sub and do the same with the tops.) Make sure your speakers are not 4 Ohm boxes, or you may run into issues.

    The reason a horn will blow is, if the input signal has more power than the internal crossover can handle, the horn will get a burst of power beyond it's capability and it will die. High Frequency horns are very finnicky, this is why it is best to make sure your speakers are rated the same, or slightly more than your amp.

    This is the best case if you are running consumer gear without a complete understanding of how to protect your investment (gear).

    if you could post your signal chain a little more clearly that would help:
    Example:

    Mixer - EQ - Amp - Speaker (top) - Speaker (Sub).... etc...

    that way it will be easier to get an idea of what you are actually doing....

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