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Subwoofers
The $100 130db project
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<blockquote data-quote="surreal" data-source="post: 7208589" data-attributes="member: 619249"><p>*Posted on CACO as well - copy*</p><p></p><p>So in an ever on-going goal of efficiency in any and every way possible.. Ive taken a liking to a little woofer. The <a href="http://www.mcmelectronics.com/product/MCM-AUDIO-SELECT-55-2421-/55-2421" target="_blank">MCM 8"</a> to be exact. Anyone in HT will probably recognize it.</p><p></p><p>My goal was originally a decent system for 100 bucks. The woofer is ~40 shipped, and MDF is 30, but the amp will be a problem.</p><p></p><p>So can we get a full system for 100 bucks? No.. but expanding the budget to ~150 should get you an amp with a SSF and a sweet little woofer.</p><p></p><p>The enclosure Ive been working on..</p><p></p><p><img src="http://img193.imageshack.us/img193/7684/modeln.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>34wide, 11.5 tall, 10.25 deep.</p><p></p><p>L4 28.5"</p><p></p><p>L3 28"</p><p></p><p>L2 3.75"</p><p></p><p>L1 30.25"</p><p></p><p>Guide widths.</p><p></p><p>S1 .75</p><p></p><p>S2 1.25</p><p></p><p>S3 1.75</p><p></p><p>S4 2.15</p><p></p><p>S5 2.25</p><p></p><p>S6 2.75</p><p></p><p><img src="http://img821.imageshack.us/img821/1818/schemd.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Response..</p><p></p><p><img src="http://img191.imageshack.us/img191/8052/responseg.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Is it a low end monster? No, but most people going for a single 8 and low budget wont be striving for teh l0ws. The idea is, when placed properly in a vehicle, the added loading and cabin gain should get you down to 35 or more with ease (thats the idea, anyway).</p><p></p><p>An off-axis firing enclosure may help as well, but would require a larger mouth. But when placed close to a trunk wall for example, the added extension and loading should give you smoother low end. Though of course, every vehicle is different and this is a generic enclosure design, being not vehicle-specific.</p><p></p><p>So The $150 dollar mark ain't too shabby for a little woofer with a ~90db 1w sensitivity.</p><p></p><p>Note* In this enclosure, the woofer will mount inverted and max out around 200w xmax wise. It will need a subsonic set around 35hz to keep it safe.</p><p></p><p>My paycheck has been held due to weather so Ive yet to build one. If anyone else wants to give it a shot I would love to hear the results. I could also do a low-end extension enclosure for the woofer if anyone would like, though of course at expense of good sensitivity (around 6db lost for 30hz or lower in a normal ported box)</p><p></p><p>Paired with a 200w@4ohm amp. It has a predicted spl of 125db. In car, Im guessing the goal of 130db is entirely possible.</p></blockquote><p></p>
[QUOTE="surreal, post: 7208589, member: 619249"] *Posted on CACO as well - copy* So in an ever on-going goal of efficiency in any and every way possible.. Ive taken a liking to a little woofer. The [URL="http://www.mcmelectronics.com/product/MCM-AUDIO-SELECT-55-2421-/55-2421"]MCM 8"[/URL] to be exact. Anyone in HT will probably recognize it. My goal was originally a decent system for 100 bucks. The woofer is ~40 shipped, and MDF is 30, but the amp will be a problem. So can we get a full system for 100 bucks? No.. but expanding the budget to ~150 should get you an amp with a SSF and a sweet little woofer. The enclosure Ive been working on.. [IMG]http://img193.imageshack.us/img193/7684/modeln.png[/IMG] 34wide, 11.5 tall, 10.25 deep. L4 28.5" L3 28" L2 3.75" L1 30.25" Guide widths. S1 .75 S2 1.25 S3 1.75 S4 2.15 S5 2.25 S6 2.75 [IMG]http://img821.imageshack.us/img821/1818/schemd.png[/IMG] Response.. [IMG]http://img191.imageshack.us/img191/8052/responseg.png[/IMG] Is it a low end monster? No, but most people going for a single 8 and low budget wont be striving for teh l0ws. The idea is, when placed properly in a vehicle, the added loading and cabin gain should get you down to 35 or more with ease (thats the idea, anyway). An off-axis firing enclosure may help as well, but would require a larger mouth. But when placed close to a trunk wall for example, the added extension and loading should give you smoother low end. Though of course, every vehicle is different and this is a generic enclosure design, being not vehicle-specific. So The $150 dollar mark ain't too shabby for a little woofer with a ~90db 1w sensitivity. Note* In this enclosure, the woofer will mount inverted and max out around 200w xmax wise. It will need a subsonic set around 35hz to keep it safe. My paycheck has been held due to weather so Ive yet to build one. If anyone else wants to give it a shot I would love to hear the results. I could also do a low-end extension enclosure for the woofer if anyone would like, though of course at expense of good sensitivity (around 6db lost for 30hz or lower in a normal ported box) Paired with a 200w@4ohm amp. It has a predicted spl of 125db. In car, Im guessing the goal of 130db is entirely possible. [/QUOTE]
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