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Junior Varsity
Inadequate Sub Power For a Venue... Tips/Tricks/Help
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<blockquote data-quote="John Roberts" data-source="post: 122119" data-attributes="member: 126"><p>Re: Inadequate Sub Power For a Venue... Tips/Tricks/Help</p><p></p><p></p><p>Yes, but the concept of two bridged power amp outputs combining power is valid. </p><p></p><p>understood (or should i say misunderstood).</p><p></p><p>Yup... but sometimes adding an amp to say a powered mixer, this could actually be a useful mode of operation. </p><p></p><p>That capability went away with the modern electronic balanced inputs, that don't have a passive attenuator across the input. (I did one amp with a balanced passive attenuator across it's input, but the attenuator kill of that topology approach was inferior, so i didn't expand it into other models.) </p><p></p><p>You don't need to tell me about that,,, I lived it for 15 years. </p><p></p><p>In fact that is standard practice in the factory when building the amps to short them while in the burn-in rack to confirm the protection features all work. </p><p></p><p>That was not really an intended use. Peavey was not first in the market to push 2 ohm operation and Peavey sold the auto-match auto-formers so customers could match speaker loads to the optimal design load for the amps. </p><p></p><p>I recall one discussion with Jack Sondermeyer (the father of the CS800) about an obscure low impedance approach for small installed sound systems. Instead of stepping up to 70/100V and adding step down transformer at each speaker. One auto-match steps down the amp output to be happy driving 1 ohm loads, and then you hang a bunch of 8 ohm speakers in parallel. Of course the wire losses are higher, so not appropriate for very long speaker runs, but cheap and not so dirty for small background music or installed systems. </p><p></p><p>The hard to blow up amps, saved many a gig, when a system lost one amp and finished with the speakers doubled up on the working amp. It would usually work if you didn't press your luck thermally, and weren't already overloading the amps. </p><p></p><p></p><p>I was working at Peavey when we abandoned the IC sockets and that was perhaps the beginning of the end for cheap easy repairs, but FWIW opamps had become so reliable that with the exception of inputs and outputs opamp failures in the middle of the boards didn't require much attention. The shift to SMD technology was the last nail in the coffin. </p><p></p><p>It is too expensive to build product not using SMD today, but not as easy to repair as old school through hole. </p><p></p><p>JR</p></blockquote><p></p>
[QUOTE="John Roberts, post: 122119, member: 126"] Re: Inadequate Sub Power For a Venue... Tips/Tricks/Help Yes, but the concept of two bridged power amp outputs combining power is valid. understood (or should i say misunderstood). Yup... but sometimes adding an amp to say a powered mixer, this could actually be a useful mode of operation. That capability went away with the modern electronic balanced inputs, that don't have a passive attenuator across the input. (I did one amp with a balanced passive attenuator across it's input, but the attenuator kill of that topology approach was inferior, so i didn't expand it into other models.) You don't need to tell me about that,,, I lived it for 15 years. In fact that is standard practice in the factory when building the amps to short them while in the burn-in rack to confirm the protection features all work. That was not really an intended use. Peavey was not first in the market to push 2 ohm operation and Peavey sold the auto-match auto-formers so customers could match speaker loads to the optimal design load for the amps. I recall one discussion with Jack Sondermeyer (the father of the CS800) about an obscure low impedance approach for small installed sound systems. Instead of stepping up to 70/100V and adding step down transformer at each speaker. One auto-match steps down the amp output to be happy driving 1 ohm loads, and then you hang a bunch of 8 ohm speakers in parallel. Of course the wire losses are higher, so not appropriate for very long speaker runs, but cheap and not so dirty for small background music or installed systems. The hard to blow up amps, saved many a gig, when a system lost one amp and finished with the speakers doubled up on the working amp. It would usually work if you didn't press your luck thermally, and weren't already overloading the amps. I was working at Peavey when we abandoned the IC sockets and that was perhaps the beginning of the end for cheap easy repairs, but FWIW opamps had become so reliable that with the exception of inputs and outputs opamp failures in the middle of the boards didn't require much attention. The shift to SMD technology was the last nail in the coffin. It is too expensive to build product not using SMD today, but not as easy to repair as old school through hole. JR [/QUOTE]
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