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<blockquote data-quote="tsenfw" data-source="post: 4137806" data-attributes="member: 581534"><p>Ok, I have a 8" JL 8w3v2 that I'm bumpin till my 12 comes in the mail (also for testing purposes). I have it mounted in .77cu ft enclosure after sub displacement and it's obviously wayyyyyyy over the recommended .375 sealed enclosure size. The recommended ported size is .75cu ft.</p><p></p><p>If I wanted to add port(s) to this enclosure to tune it to 30hz what diameter and length pvc could I use? I couldn't find the correct answer with winisd, I was getting some really screwy results like 145" length!</p><p></p><p>I know it's ghetto, I just want some bass in the mean time and see what this 8 can do!</p><p></p><p>Sub specs:</p><p></p><p># Size : 8"</p><p></p><p># Free Air Resonance (Fs) : 34.5Hz</p><p></p><p># Electrical "Q" (Qes) : 0.468</p><p></p><p># Mechanical "Q" (Qms) : 7.84</p><p></p><p># Total Speaker "Q" (Qts) : 0.441</p><p></p><p># Equivalent Compliance (Vas) : 0.79 cu. ft. / 22.4 liters</p><p></p><p># One-Way, Linear Excursion (Xmax) : 0.39" / 9.9mm</p><p></p><p># Reference Efficiency (no) : 0.189%</p><p></p><p># Efficiency (1W/1m) : 85.0dB SPL</p><p></p><p># Effective Piston Area (Sd) : 33.2 sq.in. / 0.0214 sq.m.</p><p></p><p># DC Resistance (Re) : 6.70-Ohms</p><p></p><p># Nominal Impedance (Znom) : DUAL 4-Ohms</p><p></p><p># Power Handling (Continious) : 125 Watts</p><p></p><p># Mounting Depth : 4.31" (109mm)</p><p></p><p># Approximate Weight : 8.3 LBS</p></blockquote><p></p>
[QUOTE="tsenfw, post: 4137806, member: 581534"] Ok, I have a 8" JL 8w3v2 that I'm bumpin till my 12 comes in the mail (also for testing purposes). I have it mounted in .77cu ft enclosure after sub displacement and it's obviously wayyyyyyy over the recommended .375 sealed enclosure size. The recommended ported size is .75cu ft. If I wanted to add port(s) to this enclosure to tune it to 30hz what diameter and length pvc could I use? I couldn't find the correct answer with winisd, I was getting some really screwy results like 145" length! I know it's ghetto, I just want some bass in the mean time and see what this 8 can do! Sub specs: # Size : 8" # Free Air Resonance (Fs) : 34.5Hz # Electrical "Q" (Qes) : 0.468 # Mechanical "Q" (Qms) : 7.84 # Total Speaker "Q" (Qts) : 0.441 # Equivalent Compliance (Vas) : 0.79 cu. ft. / 22.4 liters # One-Way, Linear Excursion (Xmax) : 0.39" / 9.9mm # Reference Efficiency (no) : 0.189% # Efficiency (1W/1m) : 85.0dB SPL # Effective Piston Area (Sd) : 33.2 sq.in. / 0.0214 sq.m. # DC Resistance (Re) : 6.70-Ohms # Nominal Impedance (Znom) : DUAL 4-Ohms # Power Handling (Continious) : 125 Watts # Mounting Depth : 4.31" (109mm) # Approximate Weight : 8.3 LBS [/QUOTE]
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