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<blockquote data-quote="Kimo Lewis" data-source="post: 25247" data-attributes="member: 497"><p>Re: Coaxial Wedge Collaboration</p><p></p><p></p><p></p><p>I don't understand your thoughts here... I am educated as an electrical engineer. I only bring that up to explain I do have an understanding of Fourier analysis including DFT and FFT (though I have forgotten more than I remember). But I too have little practical experience translating those theories to a DSP Microcontroller and implementing in microcode. My day gig is a software developer and I have looked at the same algorithms in Java, C++, and Python. I have read up on the subject and do believe it is possible for a DIYer. It would require some trial and error and a good mentor. Where I am confused is you admittedly acknowledge you don't know enough theory to tackle a DSP solution which corrects for deficiencies in impulse response. Then how do you know how much "horsepower" is needed? In addition, I opened myself up by acknowledging I don't know exactly the required DSP engine to pull this off, because I said, "probably lots of DSP horsepower", the operative word being “probably”. At present, my only frame of reference for a DIY DSP solution is either Mini DSP or Behringer's ULTRACURVE PRO DEQ2496. The Mini DSP has been dismissed as not having enough "horsepower" to correct for impulse response by other more knowledgeable people then me elsewhere in threads discussing the exact same topic. The Behringer is usually dismissed because it doesn't have enough I/O to handle crossover functions. All other manufacturers of commercial DSP don't open up their products to the DIY market, to my knowledge. If they do, then please pass on what products allow customization. My hope was to build our own DSP engine that could truly make a difference and create a "Cadillac" instead of another "Chevy". Too many Chevys all ready IMO. I admit, this is a long shot, but still worth considering.</p><p></p><p>I do understand that class D power amps have nothing to do with DSP. But to me, the gain structure of the amp and DSP need to be considered collectively, therefore, I think of them together.</p><p></p><p></p><p></p><p>I would assume you are also considering the design of the passive crossover in this statement? After all, the crossover is responsible for possibly removing peaks (with serial or parallel notch filters), possible zobel network to curb rising impedance for woofer, and of course integrating the two drivers “seamlessly” which may and usually does require asymmetrical slopes. The type of components need to be considered too as not to create distortion (very small voltage caps will cause distortion) or burn up resistors (small wattage resisters will burn up).</p><p></p><p></p><p></p><p>It appears the bar has been set with economics as the driving force, which is usually the case with many DIY projects, and musical instrument grade commercial products as well. Not a bad thing, just stating the obvious. </p><p></p><p>$600.... hmmmm.... Will you want to include labor and parts and materials?</p><p></p><p>Option one:</p><p>BMS 12CN680 (which includes the 4552 compression driver) = $411 (a quote Jack gave earlier and he said it would be 15% cheeper in a group buy)</p><p>Too Tall's passive crossover = $150 (this was the price I paid years ago, I have no idea what he charges now)</p><p>wood, glue, paint, hardware = $100</p><p>labor = ?</p><p>total = $661 + labor</p><p></p><p>Option Two:</p><p>I don't know how to make a coax wedge cheeper and still hit the SPL and sonic quality you are expecting. I am hoping someone else has a better option than one. In my mind, it will require trial and error to figure out a good crossover and A/B listening with option one.</p><p></p><p></p><p></p><p></p><p>Realy... Wow.... I tip my hat to you.... You must have awesome ears and auditory memory. I couldn't do that, which I is why I will have to continue to rely on measurements and data. Even then, I couldn't blindly tell you what driver was used.</p><p></p><p></p><p>Kimo</p></blockquote><p></p>
[QUOTE="Kimo Lewis, post: 25247, member: 497"] Re: Coaxial Wedge Collaboration I don't understand your thoughts here... I am educated as an electrical engineer. I only bring that up to explain I do have an understanding of Fourier analysis including DFT and FFT (though I have forgotten more than I remember). But I too have little practical experience translating those theories to a DSP Microcontroller and implementing in microcode. My day gig is a software developer and I have looked at the same algorithms in Java, C++, and Python. I have read up on the subject and do believe it is possible for a DIYer. It would require some trial and error and a good mentor. Where I am confused is you admittedly acknowledge you don't know enough theory to tackle a DSP solution which corrects for deficiencies in impulse response. Then how do you know how much "horsepower" is needed? In addition, I opened myself up by acknowledging I don't know exactly the required DSP engine to pull this off, because I said, "probably lots of DSP horsepower", the operative word being “probably”. At present, my only frame of reference for a DIY DSP solution is either Mini DSP or Behringer's ULTRACURVE PRO DEQ2496. The Mini DSP has been dismissed as not having enough "horsepower" to correct for impulse response by other more knowledgeable people then me elsewhere in threads discussing the exact same topic. The Behringer is usually dismissed because it doesn't have enough I/O to handle crossover functions. All other manufacturers of commercial DSP don't open up their products to the DIY market, to my knowledge. If they do, then please pass on what products allow customization. My hope was to build our own DSP engine that could truly make a difference and create a "Cadillac" instead of another "Chevy". Too many Chevys all ready IMO. I admit, this is a long shot, but still worth considering. I do understand that class D power amps have nothing to do with DSP. But to me, the gain structure of the amp and DSP need to be considered collectively, therefore, I think of them together. I would assume you are also considering the design of the passive crossover in this statement? After all, the crossover is responsible for possibly removing peaks (with serial or parallel notch filters), possible zobel network to curb rising impedance for woofer, and of course integrating the two drivers “seamlessly” which may and usually does require asymmetrical slopes. The type of components need to be considered too as not to create distortion (very small voltage caps will cause distortion) or burn up resistors (small wattage resisters will burn up). It appears the bar has been set with economics as the driving force, which is usually the case with many DIY projects, and musical instrument grade commercial products as well. Not a bad thing, just stating the obvious. $600.... hmmmm.... Will you want to include labor and parts and materials? Option one: BMS 12CN680 (which includes the 4552 compression driver) = $411 (a quote Jack gave earlier and he said it would be 15% cheeper in a group buy) Too Tall's passive crossover = $150 (this was the price I paid years ago, I have no idea what he charges now) wood, glue, paint, hardware = $100 labor = ? total = $661 + labor Option Two: I don't know how to make a coax wedge cheeper and still hit the SPL and sonic quality you are expecting. I am hoping someone else has a better option than one. In my mind, it will require trial and error to figure out a good crossover and A/B listening with option one. Realy... Wow.... I tip my hat to you.... You must have awesome ears and auditory memory. I couldn't do that, which I is why I will have to continue to rely on measurements and data. Even then, I couldn't blindly tell you what driver was used. Kimo [/QUOTE]
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