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<blockquote data-quote="Silas Pradetto" data-source="post: 50826" data-attributes="member: 34">Re: Impedance question on double 15 with a hornMy concern was trying to &quot;DIY&quot; an improvement to an off-the-shelf box, which, even if it sounds better after the DIY modification, is no longer the off-the-shelf box, and can&#039;t be represented as such.And Alan has stated (or implied?) in the thread about the tunings for the LA325s that he doesn&#039;t have a way to measure the boxes other than his hearing.I would think that the minimum measurement capabilities for designing and tuning a box with a passive crossover would include impedance sweeping along with some sort of dual-channel FFT measurement system such that phase and magnitude could be assessed. Of course crossover design knowledge would help as well. Plugging random and obviously-incorrect drivers into a crossover isn&#039;t going to yield any sort of good result.Like I said before, in my annoyed voice <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f600.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":D" title="Big grin&nbsp; &nbsp; :D"&nbsp; data-smilie="8"data-shortname=":D" />~:-D~:grin:, trying to do all this without the proper tools and experience is not going to end up well. And even if one does have the tools to do it right, DIY boxes still don&#039;t make any financial sense in the real world.Alan, if you are doing this purely for the learning exercise with the chance that you may end up with a better sounding box, I applaud your determination and quest for knowledge.</blockquote>

[QUOTE="Silas Pradetto, post: 50826, member: 34"] Re: Impedance question on double 15 with a horn My concern was trying to "DIY" an improvement to an off-the-shelf box, which, even if it sounds better after the DIY modification, is no longer the off-the-shelf box, and can't be represented as such. And Alan has stated (or implied?) in the thread about the tunings for the LA325s that he doesn't have a way to measure the boxes other than his hearing. I would think that the minimum measurement capabilities for designing and tuning a box with a passive crossover would include impedance sweeping along with some sort of dual-channel FFT measurement system such that phase and magnitude could be assessed. Of course crossover design knowledge would help as well. Plugging random and obviously-incorrect drivers into a crossover isn't going to yield any sort of good result. Like I said before, in my annoyed voice :D~:-D~:grin:, trying to do all this without the proper tools and experience is not going to end up well. And even if one does have the tools to do it right, DIY boxes [I]still [/I]don't make any financial sense in the real world. Alan, if you are doing this purely for the learning exercise with the chance that you may end up with a better sounding box, I applaud your determination and quest for knowledge. [/QUOTE]

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