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Coaxial Wedge Collaboration
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<blockquote data-quote="Bennett Prescott" data-source="post: 25223" data-attributes="member: 4"><p>Re: Coaxial Wedge Collaboration</p><p></p><p></p><p>The problem isn't the horsepower (that is widely available today, and it has nothing to do with the class of amp used) but that a very precise model of the box is needed and wavelet analysis in a known acoustic environment be performed. This is out of my expertise, I have a rough understanding of how FIR filtering works and what Dave is doing, but I have no ability to get there. There has been an explosion recently of boxes using clever impulse response convolution to solve time domain problems, which is great, but there are a handful of people who can actually build these presets and I probably know half of them.</p><p></p><p>Problem two is, you think getting basic parametric EQ and bandpass filters to correlate between DSPs is tough, now imagine trying to do that and FIR correction. I do not envy Rich Frembes his job, and Fulcrum Acoustics has really gone a step above by making presets for their boxes available for essentially every DSP platform.</p><p></p><p>On a side note, the reason many coaxes sound bad is because the horn throat is often arbitrary. Many, many manufacturers do not pay proper attention to the transition from the phase plug, to the driver throat, to the horn throat, to the expansion. In fact, just try getting good specs on the driver throat itself from most driver manufacturers. Good luck.</p><p></p><p>If this project is to succeed we must pick a good sounding coax that requires simple processing and build a passive XO that gets it 90% there. The driver is everything. Then we can suggest settings for users who also want to slap a DSP on it, bi-amp or not. If we can make a wedge that does in the mid 120dB range and sounds good out of the box for under $600 I think we're there. If not, it makes more sense to buy a commercial product, especially as the former Microwedge (especially the 12") gets damn loud and sounds good even passive for such a tiny box. You can do 6dB or so better than that in a 12" coax, but not in that box size and not for $1K.</p><p></p><p>P.S. I agree the BMS 4552 kicks ass. If you spend as much time inside boxes as I do, you find it crops up in some unexpected places. I think I've probably got a better than 50% chance of picking boxes that use that driver by ear.</p></blockquote><p></p>
[QUOTE="Bennett Prescott, post: 25223, member: 4"] Re: Coaxial Wedge Collaboration The problem isn't the horsepower (that is widely available today, and it has nothing to do with the class of amp used) but that a very precise model of the box is needed and wavelet analysis in a known acoustic environment be performed. This is out of my expertise, I have a rough understanding of how FIR filtering works and what Dave is doing, but I have no ability to get there. There has been an explosion recently of boxes using clever impulse response convolution to solve time domain problems, which is great, but there are a handful of people who can actually build these presets and I probably know half of them. Problem two is, you think getting basic parametric EQ and bandpass filters to correlate between DSPs is tough, now imagine trying to do that and FIR correction. I do not envy Rich Frembes his job, and Fulcrum Acoustics has really gone a step above by making presets for their boxes available for essentially every DSP platform. On a side note, the reason many coaxes sound bad is because the horn throat is often arbitrary. Many, many manufacturers do not pay proper attention to the transition from the phase plug, to the driver throat, to the horn throat, to the expansion. In fact, just try getting good specs on the driver throat itself from most driver manufacturers. Good luck. If this project is to succeed we must pick a good sounding coax that requires simple processing and build a passive XO that gets it 90% there. The driver is everything. Then we can suggest settings for users who also want to slap a DSP on it, bi-amp or not. If we can make a wedge that does in the mid 120dB range and sounds good out of the box for under $600 I think we're there. If not, it makes more sense to buy a commercial product, especially as the former Microwedge (especially the 12") gets damn loud and sounds good even passive for such a tiny box. You can do 6dB or so better than that in a 12" coax, but not in that box size and not for $1K. P.S. I agree the BMS 4552 kicks ass. If you spend as much time inside boxes as I do, you find it crops up in some unexpected places. I think I've probably got a better than 50% chance of picking boxes that use that driver by ear. [/QUOTE]
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