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Using the Wrong DSP (split from "Peavey Versarray")
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<blockquote data-quote="Phil Graham" data-source="post: 3427" data-attributes="member: 430"><p>Donnie,</p><p></p><p>I'm glad that rig is out and people are experiencing good things from it. <em>I should be clear, though, that my "pretty good DSP settings" for KF650 were/are nothing more than (<strong>properly</strong>) using SMAART to measure the output of the DSP and match the transfer function supplied by EAW</em>. On the DR260 that first requires shuffling some of the HF parametrics to the input side filters, and then measuring what the processor is actually doing, modifying it to match EAW's curves as closely as possible. I recall getting within 1/2 dB everywhere.</p><p></p><p><em>I think we've FINALLY clearly established as common knowledge that all DSPs do things differently, and the transfer functions (especially at HF) can have multiple dB differences between processors with nominally the "same" settings.</em> </p><p></p><p>I think Bennett deserves a large amount of the credit of getting that into the public consciousness of pro audio practicioners by soliciting measurements and getting an article published on it in FOH Magazine. I remember he and I having a phone conversation quite a while back discussing what sort of filter settings he could use for that article that would behave like realistic processing while serving to highlight the differences between processors as much as possible. It is gratifying to see how far he ran with that. </p><p></p><p>The folks at Fulcrum Acoustic (<a href="http://www.fulcrum-acoustic.com" target="_blank">www.fulcrum-acoustic.com</a>) deserve mention for providing unique, specific settings for most major DSP processors that insure their speakers are as similar as possible independent of DSP platform. This, or locking customers into a specific DSP, are the only ways to insure consistency.</p><p></p><p>Also, EAW and EV both provide transfer functions of their processing that one can match with a measurement platform (EAW -> SMAART, EV -> Systune). To be completely honest, the TFs I've seen out of EAW have been measured more properly and consistently than out of EV, but at least both manufacturers are giving it a shot. I've reached out to EV with suggestions on how to unify their Systune TF libraries, and those discussions made it to the top of their engineering team. There may be other manufacturers that do the same in terms of TF, but EAW and EV are the only two I can personally vouch for.</p><p></p><p>Finally, anyone who hasn't read Bennett's <a href="http://www.bennettprescott.com/downloads/TwoProcessors.pdf" target="_blank">FOH article</a> on DSP differences, or <a href="http://www.bennettprescott.com/downloads/DSP_Differences.pdf" target="_blank">more in-depth presentation</a> for the Parson's expo should. You'll find it eye-opening, and hopefully help you justify the expense of having a measurement-savvy person insure your processors match the desire response(s) that your loudspeaker manufacturers intended.</p></blockquote><p></p>
[QUOTE="Phil Graham, post: 3427, member: 430"] Donnie, I'm glad that rig is out and people are experiencing good things from it. [I]I should be clear, though, that my "pretty good DSP settings" for KF650 were/are nothing more than ([B]properly[/B]) using SMAART to measure the output of the DSP and match the transfer function supplied by EAW[/I]. On the DR260 that first requires shuffling some of the HF parametrics to the input side filters, and then measuring what the processor is actually doing, modifying it to match EAW's curves as closely as possible. I recall getting within 1/2 dB everywhere. [I]I think we've FINALLY clearly established as common knowledge that all DSPs do things differently, and the transfer functions (especially at HF) can have multiple dB differences between processors with nominally the "same" settings.[/I] I think Bennett deserves a large amount of the credit of getting that into the public consciousness of pro audio practicioners by soliciting measurements and getting an article published on it in FOH Magazine. I remember he and I having a phone conversation quite a while back discussing what sort of filter settings he could use for that article that would behave like realistic processing while serving to highlight the differences between processors as much as possible. It is gratifying to see how far he ran with that. The folks at Fulcrum Acoustic ([URL="http://www.fulcrum-acoustic.com"]www.fulcrum-acoustic.com[/URL]) deserve mention for providing unique, specific settings for most major DSP processors that insure their speakers are as similar as possible independent of DSP platform. This, or locking customers into a specific DSP, are the only ways to insure consistency. Also, EAW and EV both provide transfer functions of their processing that one can match with a measurement platform (EAW -> SMAART, EV -> Systune). To be completely honest, the TFs I've seen out of EAW have been measured more properly and consistently than out of EV, but at least both manufacturers are giving it a shot. I've reached out to EV with suggestions on how to unify their Systune TF libraries, and those discussions made it to the top of their engineering team. There may be other manufacturers that do the same in terms of TF, but EAW and EV are the only two I can personally vouch for. Finally, anyone who hasn't read Bennett's [URL="http://www.bennettprescott.com/downloads/TwoProcessors.pdf"]FOH article[/URL] on DSP differences, or [URL="http://www.bennettprescott.com/downloads/DSP_Differences.pdf"]more in-depth presentation[/URL] for the Parson's expo should. You'll find it eye-opening, and hopefully help you justify the expense of having a measurement-savvy person insure your processors match the desire response(s) that your loudspeaker manufacturers intended. [/QUOTE]
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