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Low Earth Orbit
DIY Audio
New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Ethan Greaves" data-source="post: 214767" data-attributes="member: 14552"><p>Hey everyone + Peter, this thread is really inspiring and I've learnt a lot. Thanks so much Peter for this incredible project and build. I am intending to build 2x PM90's in the next month and have read through all 39 pages of this thread. Currently intending on the BMS4954HE + B+C 12NDL76's with a 16ohm BMS passive crossover. Here are my questions:</p><p></p><p>- Am I correct in thinking this will be appropriately amped with a single NL4 connector in the back? 1+2 12's parallel and the HF+VHF on pins 3 + 4 ? </p><p></p><p>- Is the B+C DXC464 a better choice now? If so - will the BMS passive crossover still work correctly? We definitely won't have a budget for FIR processing I think</p><p></p><p>- Noticing that the HF - VHF seems to work on a 1.49~1.64ms delay - the 0.2ms difference is negligible ? Or could you achieve this by installing a delay component onto the passive crosser ? (Is that even possible?)</p><p></p><p>- Can the entire build be achieved with 15mm birch ply ? Or is better to use a thicker ply for external/internal?</p><p></p><p>- Can the RCF horn flare be rotated 90 degrees so the PM90's can be positioned horizontally instead of vertically ? </p><p>(I am intending to sit each PM90 on a 4 leg pedestal type thing on top of 2x Martin Audio WLX 18's per side)</p><p></p><p>- Lastly, any recommendations on amplifier/processing for 4x 18" subs (B+C 18TBX100's) and 2x PM90's that won't break the bank after spending 4k on drivers?</p><p></p><p>Thank you all - some info on myself: I am a 26 year old audio engineer (bands/touring) + DJ/events background based in Brisbane, Australia. This will be my first DIY speaker build and it's humbling to know how much more there is to learn but I do learn very quickly and I'm really excited to put this project together.</p><p></p><p>Thank you again all! I really appreciate any insight, advice and expertise anyone can offer</p></blockquote><p></p>
[QUOTE="Ethan Greaves, post: 214767, member: 14552"] Hey everyone + Peter, this thread is really inspiring and I've learnt a lot. Thanks so much Peter for this incredible project and build. I am intending to build 2x PM90's in the next month and have read through all 39 pages of this thread. Currently intending on the BMS4954HE + B+C 12NDL76's with a 16ohm BMS passive crossover. Here are my questions: - Am I correct in thinking this will be appropriately amped with a single NL4 connector in the back? 1+2 12's parallel and the HF+VHF on pins 3 + 4 ? - Is the B+C DXC464 a better choice now? If so - will the BMS passive crossover still work correctly? We definitely won't have a budget for FIR processing I think - Noticing that the HF - VHF seems to work on a 1.49~1.64ms delay - the 0.2ms difference is negligible ? Or could you achieve this by installing a delay component onto the passive crosser ? (Is that even possible?) - Can the entire build be achieved with 15mm birch ply ? Or is better to use a thicker ply for external/internal? - Can the RCF horn flare be rotated 90 degrees so the PM90's can be positioned horizontally instead of vertically ? (I am intending to sit each PM90 on a 4 leg pedestal type thing on top of 2x Martin Audio WLX 18's per side) - Lastly, any recommendations on amplifier/processing for 4x 18" subs (B+C 18TBX100's) and 2x PM90's that won't break the bank after spending 4k on drivers? Thank you all - some info on myself: I am a 26 year old audio engineer (bands/touring) + DJ/events background based in Brisbane, Australia. This will be my first DIY speaker build and it's humbling to know how much more there is to learn but I do learn very quickly and I'm really excited to put this project together. Thank you again all! I really appreciate any insight, advice and expertise anyone can offer [/QUOTE]
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