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Low Earth Orbit
DIY Audio
New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Peter Morris" data-source="post: 214778" data-attributes="member: 652"><p>Hi Ethan,</p><p></p><p>- Yes and NL4 will be all you need with the passive crossover.</p><p>- B&C DCX464 its better than a BMS4594 but the 4594HE is about the same all things considered. The DCX464 needs a different crossover - FB-464 - USSpeakers have them.</p><p>[ATTACH=full]209390[/ATTACH]</p><p>- The BMS passive crossover is designed so that there is no need for different delays in the HF / VHF - its has 18/12 dB/oct slopes and the different phase response corrects for the time difference.</p><p>- 15mm is fine with bracing but you will need a spacer under the 12" drivers.</p><p>- its best to mount the box vertically - the horizontal pattern of the 2 x 12" drivers starts to collapse as the frequency increases because of the dipole action caused by the spacing of the drivers. At 400- 500 Hz its around 50 degrees vertical - below is a manufactures plot of a speaker using the HF950 horn - the dotted red line is my best guess (rough measurements) of the PM90's vertical directivity. </p><p>[ATTACH=full]209391[/ATTACH]</p><p>BTW I'm in South Australia - send me a PM if you want.</p></blockquote><p></p>
[QUOTE="Peter Morris, post: 214778, member: 652"] Hi Ethan, - Yes and NL4 will be all you need with the passive crossover. - B&C DCX464 its better than a BMS4594 but the 4594HE is about the same all things considered. The DCX464 needs a different crossover - FB-464 - USSpeakers have them. [ATTACH type="full" alt="1610160174324.png"]209390[/ATTACH] - The BMS passive crossover is designed so that there is no need for different delays in the HF / VHF - its has 18/12 dB/oct slopes and the different phase response corrects for the time difference. - 15mm is fine with bracing but you will need a spacer under the 12" drivers. - its best to mount the box vertically - the horizontal pattern of the 2 x 12" drivers starts to collapse as the frequency increases because of the dipole action caused by the spacing of the drivers. At 400- 500 Hz its around 50 degrees vertical - below is a manufactures plot of a speaker using the HF950 horn - the dotted red line is my best guess (rough measurements) of the PM90's vertical directivity. [ATTACH type="full"]209391[/ATTACH] BTW I'm in South Australia - send me a PM if you want. [/QUOTE]
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New DIY Mid High (90deg) - AKA PM90
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