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Low Earth Orbit
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New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Ethan Greaves" data-source="post: 216556" data-attributes="member: 14552"><p>Hey guys, haven't posted in a while but have some progress pics to share when I get them off my phone. Proud to say we've finished building our own pair of PM90's - but I have an important question to ask regarding amplification and worrying that I have royally messed up here.</p><p></p><p>Basically, I have ordered and built the PM90's as:</p><p>2x 12NDL76 12" 8 ohms wired in series @ 16 ohms</p><p>1x DCX464 with passive crossover - 16 ohm</p><p></p><p>Don't ask me why, but at the time I didn't realise I could order the 12" as 4 ohms and wire in parallel to make an 8 ohm system</p><p></p><p>Currently are wired to run on one NL4 1+/1- = 12" series , 2+/2- = DCX via passive crossover</p><p></p><p>I measured the ohms with meter and they are coming up as ~7.4 ohms. I believe this is considered normal because they are measuring DC resistance</p><p></p><p>Now back to the issue at hand - I realised I may have messed up in building this as a 16 ohm system with regards to finding suitable amp/power. From specs and information in this thread, I realise I need 400W for the 12" and 160/220w for the DCX (we'll leave processing aspect to a bit later) so,</p><p></p><p>1) What power amplifier do I actually need? Does it need to be a 16 ohm 400 watt 2 channel amp for mids and 2 channel ~220 watt amp for DCX? Or can I run the whole tops system on a 4 channel 16 ohm amp @ 400 watts per channel</p><p>i.e. <a href="https://www.labgruppen.com/product.html?modelCode=P0CPE" target="_blank">https://www.labgruppen.com/product.html?modelCode=P0CPE</a></p><p>2) I know I can still safely but not efficiently amp it with an 8 ohm amp still, but if I do - does the wattage need to be above the continuous watt recommendation to make it work ?</p><p></p><p>i.e. <a href="https://proaudio.com/content/Documents/Specsheet_Linea%20Research_48M.pdf" target="_blank">https://proaudio.com/content/Documents/Specsheet_Linea Research_48M.pdf</a> </p><p>< - 48m03 or 48m06 being 400w/750w per channel ?</p><p></p><p>3) If I run it on an 8 ohm amp - will it sound fucked ? / have large loss in max volume achievable - I read somewhere you will only lose out on 3-6dB of max volume achievable by high mismatching amp and speaker impedence</p><p>4) As a learning question - Is it possible to run the whole top system + 1250w rated 18TBX100 subs on say.. the linea research 48m10 @ 1250w per channel</p><p>[URL unfurl="true"]https://proaudio.com/content/Documents/Specsheet_Linea%20Research_48M.pdf[/URL]</p><p></p><p>Sorry that my understanding of matching amps is complete newb level. Biting nails here, and feel stupid.</p></blockquote><p></p>
[QUOTE="Ethan Greaves, post: 216556, member: 14552"] Hey guys, haven't posted in a while but have some progress pics to share when I get them off my phone. Proud to say we've finished building our own pair of PM90's - but I have an important question to ask regarding amplification and worrying that I have royally messed up here. Basically, I have ordered and built the PM90's as: 2x 12NDL76 12" 8 ohms wired in series @ 16 ohms 1x DCX464 with passive crossover - 16 ohm Don't ask me why, but at the time I didn't realise I could order the 12" as 4 ohms and wire in parallel to make an 8 ohm system Currently are wired to run on one NL4 1+/1- = 12" series , 2+/2- = DCX via passive crossover I measured the ohms with meter and they are coming up as ~7.4 ohms. I believe this is considered normal because they are measuring DC resistance Now back to the issue at hand - I realised I may have messed up in building this as a 16 ohm system with regards to finding suitable amp/power. From specs and information in this thread, I realise I need 400W for the 12" and 160/220w for the DCX (we'll leave processing aspect to a bit later) so, 1) What power amplifier do I actually need? Does it need to be a 16 ohm 400 watt 2 channel amp for mids and 2 channel ~220 watt amp for DCX? Or can I run the whole tops system on a 4 channel 16 ohm amp @ 400 watts per channel i.e. [URL]https://www.labgruppen.com/product.html?modelCode=P0CPE[/URL] 2) I know I can still safely but not efficiently amp it with an 8 ohm amp still, but if I do - does the wattage need to be above the continuous watt recommendation to make it work ? i.e. [URL]https://proaudio.com/content/Documents/Specsheet_Linea%20Research_48M.pdf[/URL] < - 48m03 or 48m06 being 400w/750w per channel ? 3) If I run it on an 8 ohm amp - will it sound fucked ? / have large loss in max volume achievable - I read somewhere you will only lose out on 3-6dB of max volume achievable by high mismatching amp and speaker impedence 4) As a learning question - Is it possible to run the whole top system + 1250w rated 18TBX100 subs on say.. the linea research 48m10 @ 1250w per channel [URL unfurl="true"]https://proaudio.com/content/Documents/Specsheet_Linea%20Research_48M.pdf[/URL] Sorry that my understanding of matching amps is complete newb level. Biting nails here, and feel stupid. [/QUOTE]
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