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Low Earth Orbit
DIY Audio
Steering advice for those serious about DIY speakers.
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<blockquote data-quote="Curtis H List (Too Tall)" data-source="post: 25113" data-attributes="member: 160"><p>Re: Steering advice for those serious about DIY speakers.</p><p></p><p></p><p></p><p>Hi Phil and Jack,</p><p>It comes down to how you approach the problem.</p><p>Back in the late 70s I met up with someone who had a talent for building passive xovers. I suppose it helped that there was next to nothing on the market for active analog that had any flexibility.</p><p></p><p>In the early 80s I built him a HUGE crossover substitution box.</p><p>With that an Apple II, RTA and a FFT analyzer he was a force to be reckoned with.</p><p></p><p>He has forgotten more then I have learned in the last 15 years on the technical aspects of xover design.</p><p></p><p>That said if you gave us one week to design a 2-way passive xover the best he could hope for is a tie and I would not bet money on him.</p><p></p><p>The reason being the modern modeling program I have allows me to solve problems without me seeing what is going on “Under the Hood”.</p><p></p><p>I give it a target and it moves the values on my caps, inductors and resistors around till I have the solution.</p><p>So I don’t need to figure out what to do when the impedance goes nuts. That is what the modeling program is for.</p><p></p><p>In the end it is more complicated than that. If I just shove all the data into the program, hit start and go get a cup of coffee it will most likely go down a “Blind Alley” of one kind or another, but I am a LONG WAY from looking at radical impedance change and knowing which part to change to get a better result.</p><p>My friend might be able to do that…</p><p></p><p>I do eventually get to that point. Tweaking the values by hand (an ear) is one of the last things I do. If nothing else I move the values to part values that are for sale. I HATE unwinding inductors!!!</p></blockquote><p></p>
[QUOTE="Curtis H List (Too Tall), post: 25113, member: 160"] Re: Steering advice for those serious about DIY speakers. Hi Phil and Jack, It comes down to how you approach the problem. Back in the late 70s I met up with someone who had a talent for building passive xovers. I suppose it helped that there was next to nothing on the market for active analog that had any flexibility. In the early 80s I built him a HUGE crossover substitution box. With that an Apple II, RTA and a FFT analyzer he was a force to be reckoned with. He has forgotten more then I have learned in the last 15 years on the technical aspects of xover design. That said if you gave us one week to design a 2-way passive xover the best he could hope for is a tie and I would not bet money on him. The reason being the modern modeling program I have allows me to solve problems without me seeing what is going on “Under the Hood”. I give it a target and it moves the values on my caps, inductors and resistors around till I have the solution. So I don’t need to figure out what to do when the impedance goes nuts. That is what the modeling program is for. In the end it is more complicated than that. If I just shove all the data into the program, hit start and go get a cup of coffee it will most likely go down a “Blind Alley” of one kind or another, but I am a LONG WAY from looking at radical impedance change and knowing which part to change to get a better result. My friend might be able to do that… I do eventually get to that point. Tweaking the values by hand (an ear) is one of the last things I do. If nothing else I move the values to part values that are for sale. I HATE unwinding inductors!!! [/QUOTE]
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