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Enclosure Design & Construction
Enclosure Design ?s for 4 Blau 8" GBW801, ported @ 35hz
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<blockquote data-quote="mestapho" data-source="post: 8651397" data-attributes="member: 675317"><p>Thanks in advance for any/all advice.</p><p></p><p>Getting back into this after yrs. and I saw the thread on here about these cheap 8" drivers that are decent considering the price point and thought it'd be a fun project in the coming month or two.</p><p></p><p>Model GBW801</p><p></p><p>Fo (Hz) 46</p><p></p><p>Re (Ohms) 3.2</p><p></p><p>Qts 0.406</p><p></p><p>Qes 0.457</p><p></p><p>Qms 3.638</p><p></p><p>Cms (u M/N) 149.822</p><p></p><p>Vas (Ltr) 13.762</p><p></p><p>Mms (g) 44.7</p><p></p><p>Mmd (g) 42.4</p><p></p><p>No (%) 0.51</p><p></p><p>SPL (dB-1W/1M) 88</p><p></p><p>BL (TxM) 9.5</p><p></p><p>Krm (uOhms) 729.1</p><p></p><p>Erm 1.024</p><p></p><p>Kxm (mH) 26.7</p><p></p><p>Frequency Response (Hz) 45Hz~2KHz</p><p></p><p>Voice Coil (Diameter) 1.5"</p><p></p><p>Magnet Weight 32.2oz</p><p></p><p>Power Rating (RMS) 200Watts</p><p></p><p>Power Rating (Peak) 400Watts</p><p></p><p>They'll be going in a 2006 Avalon trunk. My HU is a Pioneer MVH-S600BS. I'm going to run them off of a Pioneer 9601 at 1ohm.</p><p></p><p>Here's what I've come up with from my research so far, please point out where I'm screwing up and let me know what changes I need to make.</p><p></p><p>From the thread about these subs on here I saw one of the guys say they modeled well in a .75 ported enclosure. So I'm designing around a 3ft^3 slot ported enclosure.</p><p></p><p><a href="http://www.caraudio.com/forums/subwoofers/636437-so-i-just-ordered-4-these.html" target="_blank">http://www.caraudio.com/forums/subwoofers/636437-so-i-just-ordered-4-these.html</a></p><p></p><p>I have 39" of width, 16" of height and maybe up to 15" of depth. I need to mock up a cardboard replica and test fit. I need to be able to remove the enclosure for family vacations a few times a year.</p><p></p><p>Using <a href="https://www.stevemeadedesigns.com/board/topic/209127-triticums-improved-port-area-calculator/" target="_blank"><span style="color: red">THIS</span></a> port area calculator I've come up with needing about 51 in^2.</p><p></p><p>Based off a height of 14.5" (internal height of enclosure) my port width will be 3.5"(51/14.5+3.5).</p><p></p><p>Then using WinISD with 3 ft^3 @36 Hz I get a port length of 29".</p><p></p><p>Using 14.5"x3.5"x29" (.85 ft^3) + port material volume (.10 ft^3) + speaker vol (approx. .02x4) I get 1.03 ft^3 of volume.</p><p></p><p>So I need a gross volume of 4 ft^3. More algebra. Using my two known max size restraints of int. size 37.5x14.5 and needing 6912ft^3 I get a depth of 12.7"</p><p></p><p>Then I used <a href="http://dbdynamixaudio.com/l-slot-vent-bass-reflex-enclosure-calculator/" target="_blank"><span style="color: red">THIS</span></a> site to get a cut sheet.</p><p></p><p><img src="http://i65.tinypic.com/4qikk5.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>At 36 Hz I calculate the SS filter/HPF should be set at 26-27 Hz.</p><p></p><p>How does that look? Is 36 Hz in the trunk of an Avalon w/these subs OK? I'm looking for good sounding bass not SPL, as much as I can expect from cheap subs. I listen to everything from Acoustic folky stuff to punk to metal to old school rap and bass music. I plan to run them rear facing. I have a ski pass through, should I center the port facing front to fire through the pass through?</p><p></p><p>This is mostly just to get me started in the hobby again w/the idea of putting in a couple of nice 10's or 12's if they'll fit, in the future.</p><p></p><p>Again thanks for taking the time to look.</p></blockquote><p></p>
[QUOTE="mestapho, post: 8651397, member: 675317"] Thanks in advance for any/all advice. Getting back into this after yrs. and I saw the thread on here about these cheap 8" drivers that are decent considering the price point and thought it'd be a fun project in the coming month or two. Model GBW801 Fo (Hz) 46 Re (Ohms) 3.2 Qts 0.406 Qes 0.457 Qms 3.638 Cms (u M/N) 149.822 Vas (Ltr) 13.762 Mms (g) 44.7 Mmd (g) 42.4 No (%) 0.51 SPL (dB-1W/1M) 88 BL (TxM) 9.5 Krm (uOhms) 729.1 Erm 1.024 Kxm (mH) 26.7 Frequency Response (Hz) 45Hz~2KHz Voice Coil (Diameter) 1.5" Magnet Weight 32.2oz Power Rating (RMS) 200Watts Power Rating (Peak) 400Watts They'll be going in a 2006 Avalon trunk. My HU is a Pioneer MVH-S600BS. I'm going to run them off of a Pioneer 9601 at 1ohm. Here's what I've come up with from my research so far, please point out where I'm screwing up and let me know what changes I need to make. From the thread about these subs on here I saw one of the guys say they modeled well in a .75 ported enclosure. So I'm designing around a 3ft^3 slot ported enclosure. [URL="http://www.caraudio.com/forums/subwoofers/636437-so-i-just-ordered-4-these.html"]http://www.caraudio.com/forums/subwoofers/636437-so-i-just-ordered-4-these.html[/URL] I have 39" of width, 16" of height and maybe up to 15" of depth. I need to mock up a cardboard replica and test fit. I need to be able to remove the enclosure for family vacations a few times a year. Using [URL="https://www.stevemeadedesigns.com/board/topic/209127-triticums-improved-port-area-calculator/"][COLOR=red]THIS[/COLOR][/URL] port area calculator I've come up with needing about 51 in^2. Based off a height of 14.5" (internal height of enclosure) my port width will be 3.5"(51/14.5+3.5). Then using WinISD with 3 ft^3 @36 Hz I get a port length of 29". Using 14.5"x3.5"x29" (.85 ft^3) + port material volume (.10 ft^3) + speaker vol (approx. .02x4) I get 1.03 ft^3 of volume. So I need a gross volume of 4 ft^3. More algebra. Using my two known max size restraints of int. size 37.5x14.5 and needing 6912ft^3 I get a depth of 12.7" Then I used [URL="http://dbdynamixaudio.com/l-slot-vent-bass-reflex-enclosure-calculator/"][COLOR=red]THIS[/COLOR][/URL] site to get a cut sheet. [IMG]http://i65.tinypic.com/4qikk5.png[/IMG] At 36 Hz I calculate the SS filter/HPF should be set at 26-27 Hz. How does that look? Is 36 Hz in the trunk of an Avalon w/these subs OK? I'm looking for good sounding bass not SPL, as much as I can expect from cheap subs. I listen to everything from Acoustic folky stuff to punk to metal to old school rap and bass music. I plan to run them rear facing. I have a ski pass through, should I center the port facing front to fire through the pass through? This is mostly just to get me started in the hobby again w/the idea of putting in a couple of nice 10's or 12's if they'll fit, in the future. Again thanks for taking the time to look. [/QUOTE]
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Enclosure Design ?s for 4 Blau 8" GBW801, ported @ 35hz
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