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Enclosure Design & Construction
Help with a ported box for 4 REX 8's
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<blockquote data-quote="db138" data-source="post: 7390339" data-attributes="member: 634506"><p>I've built many sealed boxes over the years, but this is my first attempt at building a ported enclosure. I have four RE Audio REX 8's, each currently running in .35ft^3 sealed after displacement. I want to put them in a ported box to see how much more output I can get. I have tried to play around with the numbers in WinISD, but I keep getting errors with the program. I would not be against using round ports instead of a slot port, as long as someone helped me with the plans. I'm aiming for 2 cubes and tuning to 32Hz - RE recommends 35, but I've read that most people tune the 8's to 32. Here are the numbers I have using the box designer on reaudio.com using 3/4" MDF:</p><p></p><p>38W x 13H x 12D</p><p></p><p>Port height: 11.5</p><p></p><p>Port width: 2.5</p><p></p><p>Port length 1: 8.75</p><p></p><p>Port length 2: 20</p><p></p><p>Total port length: 33.25</p><p></p><p>Square port diameter: 6.05</p><p></p><p>Square port area: 28.75</p><p></p><p>Port volume internal: 955.9375</p><p></p><p>Box volume: 1.985</p><p></p><p>Tuned frequency: 32</p><p></p><p>T/S of subs:</p><p></p><p>Electrical Q Value -Qes: 0.38</p><p></p><p>Mechanical Q Value -Qms: 4.21</p><p></p><p>Total Speaker Q Value -Qts: 0.34</p><p></p><p>Free Air Resonance -Fs: 22.8 Hz</p><p></p><p>Equivalent Compliance -Vas: 27.1 liters</p><p></p><p>One-Way, Linear Excursion -Xmax: 12 mm</p><p></p><p>Efficiency -SPL 1W/1m: 81.2 dB SPL</p><p></p><p>Effective Piston Area -Sd: 195 cm^2</p><p></p><p>DC Resistance -Re: 3.2 ohm</p><p></p><p>Nominal Impedance -Znom: Dual 4 ohm</p><p></p><p>Thermal Power Handling -Pe: 175 W</p><p></p><p>Force Factor -Bl: 15.4</p><p></p><p>I can fit them on the face of the box, but it is tight - round ports might be better because that would give me more room to mount the subs. They are being powered by an Alpine PDX-1.600, birth sheet says 666 watts. Thanks for any help.</p></blockquote><p></p>
[QUOTE="db138, post: 7390339, member: 634506"] I've built many sealed boxes over the years, but this is my first attempt at building a ported enclosure. I have four RE Audio REX 8's, each currently running in .35ft^3 sealed after displacement. I want to put them in a ported box to see how much more output I can get. I have tried to play around with the numbers in WinISD, but I keep getting errors with the program. I would not be against using round ports instead of a slot port, as long as someone helped me with the plans. I'm aiming for 2 cubes and tuning to 32Hz - RE recommends 35, but I've read that most people tune the 8's to 32. Here are the numbers I have using the box designer on reaudio.com using 3/4" MDF: 38W x 13H x 12D Port height: 11.5 Port width: 2.5 Port length 1: 8.75 Port length 2: 20 Total port length: 33.25 Square port diameter: 6.05 Square port area: 28.75 Port volume internal: 955.9375 Box volume: 1.985 Tuned frequency: 32 T/S of subs: Electrical Q Value -Qes: 0.38 Mechanical Q Value -Qms: 4.21 Total Speaker Q Value -Qts: 0.34 Free Air Resonance -Fs: 22.8 Hz Equivalent Compliance -Vas: 27.1 liters One-Way, Linear Excursion -Xmax: 12 mm Efficiency -SPL 1W/1m: 81.2 dB SPL Effective Piston Area -Sd: 195 cm^2 DC Resistance -Re: 3.2 ohm Nominal Impedance -Znom: Dual 4 ohm Thermal Power Handling -Pe: 175 W Force Factor -Bl: 15.4 I can fit them on the face of the box, but it is tight - round ports might be better because that would give me more room to mount the subs. They are being powered by an Alpine PDX-1.600, birth sheet says 666 watts. Thanks for any help. [/QUOTE]
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