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Wiring, Electrical & Installation
Series-parallel wiring and sub heat/smell
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<blockquote data-quote="hispls" data-source="post: 8767697" data-attributes="member: 614752"><p>Most orgs have at least one "music" class where it's an average SPL over time that's counted, either max or trying to get just to some number without going over. About a year ago the org we have here in the northeast started a 3 minute average, highest score with a wall and no wall class only. I've also seen rookie classes using combined score of burp and music or only allowing music but using only the peak SPL.</p><p></p><p>In days past when an org had "music" class it was limited to commercially available music that one could conceivably go out to Best Buy or some record store and buy a commercially produced copy of. Some even had their own "official" CD with various tracks that everybody had to use for metering which was good for the orgs making a few bucks off of CD sales and also so that everyone was on an equal footing. These days there's a hundred guys online who are "DJ ______" who do all manner of bass boosting ranging from some half decent remixed bass lines to just laying a test tone over pretty much any type of song you can think of, so that seems to be out the window. I still use a handful of songs that you could actually go buy on i-tunes or find on a CD, but they are inferior to DJ Test Tone or whatever dumb other ****. The point being even if you only define "music" as something I could go buy at a record store.... if they still had record stores.... there's still some stuff that's just a 3 minute sine wave. There's even a Metallica track I use for 54-55hz for 30 seconds that works really nicely but would be hurtful for someone trying to run 3X rated power to their subs if 54hz was Z-min of their system.</p><p></p><p>Yes, most of the SPL oriented subs use a tight gap (that's the SPL option with Fi and similar). It definitely requires tight tolerances in manufacturing and assembly and overall may make for less durable woofer as far as getting coil failure from outgassing bubbling a former or the coil rocking from slight misalignment in assembly or just a bad pressure spot inside the box. Taken to the extreme you can probably shave it even tighter if you figure for only 3 seconds of tone and don't even worry about allowing a few thousandths for expansion due to heat in the coil. </p><p></p><p>DD 95XX is now using some oddball 3" and a bit coil and a much larger gap than older models while the prototype we saw of the new Kicker Solo X has a very tight gap. More motor force doesn't necessarily = a better sounding sub nor a sub that really excels below 40hz so there's a lot of other design goals in play when few if any subs on the market are exclusively only being used for 3 second burp applications. How many subs do you recon are being prototyped with the ONLY question being asked being "does it gain?"</p><p></p><p>I have no data on cooling for this, could go either way or be all the same, it might be that the gap/pole being closer can pull radiated heat away from the coil better or it may be that having more air around it somehow allows better air exchange, or it could be that if the volume in the gap is very small and the space between top and pole piece is really tight that the velocity of the air flowing through with each stroke will be greater and cool greater, or at some point is it too tight that the air inside is just rarified and compressed and not even exchanged? Might just be a wash or might be something but not enough that it really makes any practical difference. Again, I haven't seen anything on the market that's really beating expectations when comparing similar dimension coils against the rest of the field. I can definitely say that the tighter gap stuff is really easy to **** up when assembling softparts so just knowing the limitations of your 10 year old Chinese slave workforce may well come into play there.</p></blockquote><p></p>
[QUOTE="hispls, post: 8767697, member: 614752"] Most orgs have at least one "music" class where it's an average SPL over time that's counted, either max or trying to get just to some number without going over. About a year ago the org we have here in the northeast started a 3 minute average, highest score with a wall and no wall class only. I've also seen rookie classes using combined score of burp and music or only allowing music but using only the peak SPL. In days past when an org had "music" class it was limited to commercially available music that one could conceivably go out to Best Buy or some record store and buy a commercially produced copy of. Some even had their own "official" CD with various tracks that everybody had to use for metering which was good for the orgs making a few bucks off of CD sales and also so that everyone was on an equal footing. These days there's a hundred guys online who are "DJ ______" who do all manner of bass boosting ranging from some half decent remixed bass lines to just laying a test tone over pretty much any type of song you can think of, so that seems to be out the window. I still use a handful of songs that you could actually go buy on i-tunes or find on a CD, but they are inferior to DJ Test Tone or whatever dumb other ****. The point being even if you only define "music" as something I could go buy at a record store.... if they still had record stores.... there's still some stuff that's just a 3 minute sine wave. There's even a Metallica track I use for 54-55hz for 30 seconds that works really nicely but would be hurtful for someone trying to run 3X rated power to their subs if 54hz was Z-min of their system. Yes, most of the SPL oriented subs use a tight gap (that's the SPL option with Fi and similar). It definitely requires tight tolerances in manufacturing and assembly and overall may make for less durable woofer as far as getting coil failure from outgassing bubbling a former or the coil rocking from slight misalignment in assembly or just a bad pressure spot inside the box. Taken to the extreme you can probably shave it even tighter if you figure for only 3 seconds of tone and don't even worry about allowing a few thousandths for expansion due to heat in the coil. DD 95XX is now using some oddball 3" and a bit coil and a much larger gap than older models while the prototype we saw of the new Kicker Solo X has a very tight gap. More motor force doesn't necessarily = a better sounding sub nor a sub that really excels below 40hz so there's a lot of other design goals in play when few if any subs on the market are exclusively only being used for 3 second burp applications. How many subs do you recon are being prototyped with the ONLY question being asked being "does it gain?" I have no data on cooling for this, could go either way or be all the same, it might be that the gap/pole being closer can pull radiated heat away from the coil better or it may be that having more air around it somehow allows better air exchange, or it could be that if the volume in the gap is very small and the space between top and pole piece is really tight that the velocity of the air flowing through with each stroke will be greater and cool greater, or at some point is it too tight that the air inside is just rarified and compressed and not even exchanged? Might just be a wash or might be something but not enough that it really makes any practical difference. Again, I haven't seen anything on the market that's really beating expectations when comparing similar dimension coils against the rest of the field. I can definitely say that the tighter gap stuff is really easy to **** up when assembling softparts so just knowing the limitations of your 10 year old Chinese slave workforce may well come into play there. [/QUOTE]
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