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New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Max Warasila" data-source="post: 214326" data-attributes="member: 3845"><p>So I wanted to go back and take a look at the components and my notes before I said anything further.</p><p></p><p>Some assumptions that I'm making here:</p><ol> <li data-xf-list-type="ol">The expected design crest factor is 12 dB. This is mostly informed by Bennett Prescott's propaganda from over the years.</li> <li data-xf-list-type="ol">The real power that a driver can dissipate effectively is much less than AES.</li> <li data-xf-list-type="ol">Drivers are all the 8 ohm versions.</li> <li data-xf-list-type="ol">The limits to concern ourselves with are:<ol> <li data-xf-list-type="ol">Peak voltage required to cause excursion limit.</li> <li data-xf-list-type="ol">Peak voltage to handle for crest factor (12 dB above the higher AES). This is likely to exhaust the mechanical limits of the driver.</li> <li data-xf-list-type="ol">RMS voltage for complex power short term thermal limit (AES rated power)</li> <li data-xf-list-type="ol">Complex power short term delivery requirement (AES rated power)</li> <li data-xf-list-type="ol">Real power long term thermal limit (adapted from <a href="https://www.powersoft-audio.com/help/armonia/index.html?Limiters.html" target="_blank"><em>Powersoft's True Power limiter table</em></a>)</li> </ol></li> </ol> <table style='width: 100%'><tr><th>Driver</th><th>Vpk @ Frequency</th><th>Vpk AES+12db</th><th>Vrms for AES Power<br /> (nominal, minimum)</th><th>AES Power</th><th>Real Power</th></tr><tr><td>B&C 12NDL76</td><td>90 V @ 100 Hz</td><td>320 V</td><td>57 V @ 8 Ω, 49 @ 6 Ω</td><td>400 W</td><td>150 W</td></tr><tr><td>BMS 4594HE HF</td><td>N/A</td><td>196 V</td><td>35 V @ 8 Ω, ? @ ? Ω</td><td>150 W</td><td>55 W</td></tr><tr><td>BMS 4594HE VHF</td><td>N/A</td><td>143 V</td><td>25 V @ 8 Ω, ? @ ? Ω</td><td>80 W</td><td>30 W</td></tr><tr><td>B&C DCX464 MF</td><td>N/A</td><td>238 V</td><td>42 V @ 8 Ω, 36 @ 6 Ω</td><td>220 W</td><td>60 W</td></tr><tr><td>B&C DCX464 HF</td><td>N/A</td><td>215 V</td><td>36 V @ 8 Ω, 38 @ 9 Ω</td><td>160 W</td><td>45 W</td></tr></table><p></p><p>As you can see, for this loudspeaker system, you don't need that much real power delivery, and should pretty much just get as much peak voltage as you can. Realistically, I think 200 V is more than adequate, really. 320 V at the 12" drivers is enough for the cones to slam into the baffle, and the CD's will start showing serious distortion at that point.</p><p></p><p>I still think my favorite option on the East coast of the US would have to be getting a used PLM20k from Clair. Otherwise your options are pretty much Powersoft, or Linea Research. I really like the tight integration of DSP into the amplification platform. I'm not sure I'd buy into the Crown offerings at the moment.</p></blockquote><p></p>
[QUOTE="Max Warasila, post: 214326, member: 3845"] So I wanted to go back and take a look at the components and my notes before I said anything further. Some assumptions that I'm making here: [LIST=1] [*]The expected design crest factor is 12 dB. This is mostly informed by Bennett Prescott's propaganda from over the years. [*]The real power that a driver can dissipate effectively is much less than AES. [*]Drivers are all the 8 ohm versions. [*]The limits to concern ourselves with are: [LIST=1] [*]Peak voltage required to cause excursion limit. [*]Peak voltage to handle for crest factor (12 dB above the higher AES). This is likely to exhaust the mechanical limits of the driver. [*]RMS voltage for complex power short term thermal limit (AES rated power) [*]Complex power short term delivery requirement (AES rated power) [*]Real power long term thermal limit (adapted from [URL='https://www.powersoft-audio.com/help/armonia/index.html?Limiters.html'][I]Powersoft's True Power limiter table[/I][/URL]) [/LIST] [/LIST] [TABLE] [TR] [TH]Driver[/TH] [TH]Vpk @ Frequency[/TH] [TH]Vpk AES+12db[/TH] [TH]Vrms for AES Power (nominal, minimum)[/TH] [TH]AES Power[/TH] [TH]Real Power[/TH] [/TR] [TR] [TD]B&C 12NDL76[/TD] [TD]90 V @ 100 Hz[/TD] [TD]320 V[/TD] [TD]57 V @ 8 Ω, 49 @ 6 Ω[/TD] [TD]400 W[/TD] [TD]150 W[/TD] [/TR] [TR] [TD]BMS 4594HE HF[/TD] [TD]N/A[/TD] [TD]196 V[/TD] [TD]35 V @ 8 Ω, ? @ ? Ω[/TD] [TD]150 W[/TD] [TD]55 W[/TD] [/TR] [TR] [TD]BMS 4594HE VHF[/TD] [TD]N/A[/TD] [TD]143 V[/TD] [TD]25 V @ 8 Ω, ? @ ? Ω[/TD] [TD]80 W[/TD] [TD]30 W[/TD] [/TR] [TR] [TD]B&C DCX464 MF[/TD] [TD]N/A[/TD] [TD]238 V[/TD] [TD]42 V @ 8 Ω, 36 @ 6 Ω[/TD] [TD]220 W[/TD] [TD]60 W[/TD] [/TR] [TR] [TD]B&C DCX464 HF[/TD] [TD]N/A[/TD] [TD]215 V[/TD] [TD]36 V @ 8 Ω, 38 @ 9 Ω[/TD] [TD]160 W[/TD] [TD]45 W[/TD] [/TR] [/TABLE] As you can see, for this loudspeaker system, you don't need that much real power delivery, and should pretty much just get as much peak voltage as you can. Realistically, I think 200 V is more than adequate, really. 320 V at the 12" drivers is enough for the cones to slam into the baffle, and the CD's will start showing serious distortion at that point. I still think my favorite option on the East coast of the US would have to be getting a used PLM20k from Clair. Otherwise your options are pretty much Powersoft, or Linea Research. I really like the tight integration of DSP into the amplification platform. I'm not sure I'd buy into the Crown offerings at the moment. [/QUOTE]
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