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New DIY Mid High (90deg) - AKA PM90
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<blockquote data-quote="Max Warasila" data-source="post: 215770" data-attributes="member: 3845"><p>Subwoofer design isn't that hard, and doesn't require that many iterations if you design it well. I suppose recreating the KS28 and all of it's compromises, then all of the solutions and marketing to overcome those compromises could require "extensive testing" and "multiple test cabinets"... My dislike of the KS28 aside, the principles of subwoofer design are pretty much just Hoffman's Iron Law and deciding on the drivers you can afford to buy.</p><p></p><p>I'm typically known as a d&b fanboy, but in this case I'm actually not - their subs aren't really the benchmark for anything except maybe B22, which is pretty good. My big issues with the KS28 are:</p><ol> <li data-xf-list-type="ol">Needlessly poor truck pack dimensions (SL-Sub is similarly irritating to truck pack). What's up with everyone forgetting about standard truck pack sizes when designing subwoofers these days? I don't want to have to purchase an extra cart which further increases the footprint just for the privilege of having it fit side by side in a truck! Anything wider than 48" is unlikely to fit in most trucks, and not every show demands a semi. For SL-sub, I understand the limitations of the front area with dual 21" drivers, but for a dual 18" the heck is up with that 52" width?</li> <li data-xf-list-type="ol">L-Vents are a marketing scheme and I don't entirely buy it. I've read the JBL study which suggests that the L-vent port shape is the way to go, but there's enough subwoofers that <em>aren't </em>chuffy (which the KS28 definitely from what I've heard in person and from others) and use more or less regular ports that it's hard to buy.</li> <li data-xf-list-type="ol">KS28 is a single chamber approach. As a result, the area in the cabinet is starting to become greater than 350L - that's typically where you start to be able to really tell that the cabinet is too large. I think this contributes to the sound that people who don't particularly like the KS28 describe. To be fair, d&b subs besides the B22 have the same sort of attribute, but that's more to do with the forced cardiod design IMO.</li> <li data-xf-list-type="ol">Their cabinet tuning is particularly low, which I don't really like.</li> </ol><p>I think this all stems from the fact that the KS28 was designed with extremely large shows and budgets in mind without regard for much else - something that seems to also have been the case with the competing SL-sub.</p><p></p><p>Actually for a front loaded dual 18 design, the second tier manufacturers really have this down - CODA, Martin, etc. all make far more truck-packable designs that perform nearly as well. The only area they don't typically perform as well is below maybe 30-35 Hz, but with things like the SCP-F available now, that is becoming less of a weakness.</p></blockquote><p></p>
[QUOTE="Max Warasila, post: 215770, member: 3845"] Subwoofer design isn't that hard, and doesn't require that many iterations if you design it well. I suppose recreating the KS28 and all of it's compromises, then all of the solutions and marketing to overcome those compromises could require "extensive testing" and "multiple test cabinets"... My dislike of the KS28 aside, the principles of subwoofer design are pretty much just Hoffman's Iron Law and deciding on the drivers you can afford to buy. I'm typically known as a d&b fanboy, but in this case I'm actually not - their subs aren't really the benchmark for anything except maybe B22, which is pretty good. My big issues with the KS28 are: [LIST=1] [*]Needlessly poor truck pack dimensions (SL-Sub is similarly irritating to truck pack). What's up with everyone forgetting about standard truck pack sizes when designing subwoofers these days? I don't want to have to purchase an extra cart which further increases the footprint just for the privilege of having it fit side by side in a truck! Anything wider than 48" is unlikely to fit in most trucks, and not every show demands a semi. For SL-sub, I understand the limitations of the front area with dual 21" drivers, but for a dual 18" the heck is up with that 52" width? [*]L-Vents are a marketing scheme and I don't entirely buy it. I've read the JBL study which suggests that the L-vent port shape is the way to go, but there's enough subwoofers that [I]aren't [/I]chuffy (which the KS28 definitely from what I've heard in person and from others) and use more or less regular ports that it's hard to buy. [*]KS28 is a single chamber approach. As a result, the area in the cabinet is starting to become greater than 350L - that's typically where you start to be able to really tell that the cabinet is too large. I think this contributes to the sound that people who don't particularly like the KS28 describe. To be fair, d&b subs besides the B22 have the same sort of attribute, but that's more to do with the forced cardiod design IMO. [*]Their cabinet tuning is particularly low, which I don't really like. [/LIST] I think this all stems from the fact that the KS28 was designed with extremely large shows and budgets in mind without regard for much else - something that seems to also have been the case with the competing SL-sub. Actually for a front loaded dual 18 design, the second tier manufacturers really have this down - CODA, Martin, etc. all make far more truck-packable designs that perform nearly as well. The only area they don't typically perform as well is below maybe 30-35 Hz, but with things like the SCP-F available now, that is becoming less of a weakness. [/QUOTE]
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