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Junior Varsity
Peavey SP4 speakers nackered, new baskets or magnets?
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<blockquote data-quote="Richard Stringer" data-source="post: 67708" data-attributes="member: 166"><p>Re: Peavey SP4 speakers nackered, new baskets or magnets?</p><p></p><p>Thanks for the reply Don. How I set gain structure is by running a 400hz sinewave through my system and connect the piezo to the output of each piece of equipment, then I turn up the channel gain controls on the dj mixer and then the master output gain control until I hear the harmonics out of the piezo. Then I turn the channel gain down just a tad so I can't hear the harmonics so the gain controls are just below the threshold of clipping and go to the next piece of equipment (my dbx 223XL crossover) and connect the piezo to the outputs and adjust the input gain knobs and both frequency output gain knobs until I can hear the harmonics sound again, and then back off on the inputs of the crossover. Then lastly I adjust the input attenuators on the amps until the clip lights only just start to flicker and then turn them down just a bit until the clip lights don't even flicker. Then I used red take cut in thin strips to mark about 2mm before where all the gain controls are set so that I know never to exceed those levels. Would it of been more accurate to use an oscilloscope? </p><p></p><p>I had the 30hz high pass filters switched on, on the amps, but my SRX728 subs were handling the frequencies from 30hz to the crossover point of 90hz, then the Peavey cabs handled frequencies from 90hz upwards. My SP4 cabs are rated at 1,000 watts continuous power handling, 2,000 watts program. I was going through the internal crossover in the SP4 cabs, I was running them in passive mode, and like I say, crossed of at 90hz on the dbx 223XL.</p><p></p><p>And yeah, the Peavey tech guys I spoke to earlier today suggest after explaining everything to him, that the most likely reason for the failure is probably that the person who owned the SP4 cabs before me most likely drove them extremely hard and for quite a few years and the tech guys think it was just unlucky for me that they couldn't take anymore so when I tried to run them sensibly, it pushed them over the edge into failure. He said he especially thought this was the cause because two of the drivers in the cabs had wires which lead from the cones to the terminals on the basket which had snapped and the wires on one driver had been soldered very poorly and the other wires on the other driver had been simply taped with electrical tape to hold them back together. It's looking like the previous owner raped the speakers for ages and then decided to sell them to me and scam me by telling me they were in perfect working order and had original drivers, when in fact one of the drivers was even an old 1505-8DT driver which Peavey stopped making years ago.</p></blockquote><p></p>
[QUOTE="Richard Stringer, post: 67708, member: 166"] Re: Peavey SP4 speakers nackered, new baskets or magnets? Thanks for the reply Don. How I set gain structure is by running a 400hz sinewave through my system and connect the piezo to the output of each piece of equipment, then I turn up the channel gain controls on the dj mixer and then the master output gain control until I hear the harmonics out of the piezo. Then I turn the channel gain down just a tad so I can't hear the harmonics so the gain controls are just below the threshold of clipping and go to the next piece of equipment (my dbx 223XL crossover) and connect the piezo to the outputs and adjust the input gain knobs and both frequency output gain knobs until I can hear the harmonics sound again, and then back off on the inputs of the crossover. Then lastly I adjust the input attenuators on the amps until the clip lights only just start to flicker and then turn them down just a bit until the clip lights don't even flicker. Then I used red take cut in thin strips to mark about 2mm before where all the gain controls are set so that I know never to exceed those levels. Would it of been more accurate to use an oscilloscope? I had the 30hz high pass filters switched on, on the amps, but my SRX728 subs were handling the frequencies from 30hz to the crossover point of 90hz, then the Peavey cabs handled frequencies from 90hz upwards. My SP4 cabs are rated at 1,000 watts continuous power handling, 2,000 watts program. I was going through the internal crossover in the SP4 cabs, I was running them in passive mode, and like I say, crossed of at 90hz on the dbx 223XL. And yeah, the Peavey tech guys I spoke to earlier today suggest after explaining everything to him, that the most likely reason for the failure is probably that the person who owned the SP4 cabs before me most likely drove them extremely hard and for quite a few years and the tech guys think it was just unlucky for me that they couldn't take anymore so when I tried to run them sensibly, it pushed them over the edge into failure. He said he especially thought this was the cause because two of the drivers in the cabs had wires which lead from the cones to the terminals on the basket which had snapped and the wires on one driver had been soldered very poorly and the other wires on the other driver had been simply taped with electrical tape to hold them back together. It's looking like the previous owner raped the speakers for ages and then decided to sell them to me and scam me by telling me they were in perfect working order and had original drivers, when in fact one of the drivers was even an old 1505-8DT driver which Peavey stopped making years ago. [/QUOTE]
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