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Voicing/tuning a 3-way home brew speaker cab
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<blockquote data-quote="john lutz" data-source="post: 5100" data-attributes="member: 244"><p>So what is a good strategy for creating the preset for a pa cab? Is there a best practice for this sort of thing or is it just what works for you.</p><p></p><p>I've got a couple of trap cabs I'd like to use for a general rock-n-roll beater pa. 2 JBL 2226H 15"s and 1 RCF N850 2" driver on some mystery 90x40 horn. The 15s are separated - the top one sealed and the bottom one ported. Cabs would sit on top of some dual 18's - so 100hz on up should work. Boxes will be powered by 2 Xti 2ks and 1 Xti 4k. </p><p></p><p>I have some measuring tools - REW and HolmImpulse. So far I came up with some presets that take into account the frequency response, roll offs, and sensitivities of the drivers. Played around with driver delays and lining up the impulse response peaks - but results are disappointing and inconsistent. I suspect I do not have the drivers playing well together yet. </p><p></p><p>I think where I'm lost is what order to make settings and take measurements, measurement mic placement, and what to shoot for in a voice? Flat on the display? Sounds neutral with mic/voice? Indoors or out? Near field or far? Low volume or high? Ignore ground bounce or use ground plane measurements? Average of all? </p><p></p><p>I suppose I could grab a 58 (or even a flatter mic) and talk and tweak til it sounds decent/neutral across the listening area and call it a day but with perhaps some pointers and a fresh start............</p></blockquote><p></p>
[QUOTE="john lutz, post: 5100, member: 244"] So what is a good strategy for creating the preset for a pa cab? Is there a best practice for this sort of thing or is it just what works for you. I've got a couple of trap cabs I'd like to use for a general rock-n-roll beater pa. 2 JBL 2226H 15"s and 1 RCF N850 2" driver on some mystery 90x40 horn. The 15s are separated - the top one sealed and the bottom one ported. Cabs would sit on top of some dual 18's - so 100hz on up should work. Boxes will be powered by 2 Xti 2ks and 1 Xti 4k. I have some measuring tools - REW and HolmImpulse. So far I came up with some presets that take into account the frequency response, roll offs, and sensitivities of the drivers. Played around with driver delays and lining up the impulse response peaks - but results are disappointing and inconsistent. I suspect I do not have the drivers playing well together yet. I think where I'm lost is what order to make settings and take measurements, measurement mic placement, and what to shoot for in a voice? Flat on the display? Sounds neutral with mic/voice? Indoors or out? Near field or far? Low volume or high? Ignore ground bounce or use ground plane measurements? Average of all? I suppose I could grab a 58 (or even a flatter mic) and talk and tweak til it sounds decent/neutral across the listening area and call it a day but with perhaps some pointers and a fresh start............ [/QUOTE]
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