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<blockquote data-quote="Farside" data-source="post: 431616" data-attributes="member: 554476">ok thanks for all the help and bearing with me since I&#039;m a nubie at this,Using WinISDVolume=1.68 ft^3 (Is this Vb in WinISD?)Tuning Freq=27.44&quot; dia port @ 24.5&quot; long for two free ends (even with an 90deg elbow I think it&#039;ll be a tight squeeze) or 24&quot; for one flanged end.The port air velocity peaks at 110 ft/s ( 33.5 m/s) @ 22.95 Hz with a Max input signal of 400W. My amp puts out 400 Watts RMS so at max power out the air velocity is getting close to 35 m/s.The SWR-1221 is rated at 300 Watts RMS so air velocity at 300W peaks at 95.3 f/s or 29 m/s @ 22.5 Hz.You say as long as I stay below 35m/s I shouldnt get alot of air noise, will I notice any at 33m/s? I guess as long as I dont crank the shit out of my system then I wont be near 35m/s and air noise shouldnt be a problem right?If I&#039;m using a Vb=1.68 ft^3, Vsub=0.128 ft^3 and Vport=0.196 ft^3 then my total (Gross) box volume must be 2.004 ft^3So this means (H-1.5)*(W-1.5)*(L-1.5)=2.004 ft^3 right? (using 3/4&quot; MDF)</blockquote>

[QUOTE="Farside, post: 431616, member: 554476"] ok thanks for all the help and bearing with me since I'm a nubie at this, Using WinISD Volume=1.68 ft^3 (Is this Vb in WinISD?) Tuning Freq=27.4 4" dia port @ 24.5" long for two free ends (even with an 90deg elbow I think it'll be a tight squeeze) [I]or 24" for one flanged end.[/I] The port air velocity peaks at 110 ft/s ( [B]33.5 m/s[/B]) @ 22.95 Hz with a Max input signal of 400W. My amp puts out 400 Watts RMS so at max power out the air velocity is getting close to 35 m/s. The SWR-1221 is rated at 300 Watts RMS so air velocity at 300W peaks at 95.3 f/s or [B]29 m/s[/B] @ 22.5 Hz. [B]You say as long as I stay below 35m/s I shouldnt get alot of air noise, will I notice any at 33m/s? I guess as long as I dont crank the shit out of my system then I wont be near 35m/s and air noise shouldnt be a problem right?[/B] If I'm using a Vb=1.68 ft^3, Vsub=0.128 ft^3 and Vport=0.196 ft^3 then my total (Gross) box volume must be 2.004 ft^3 [B]So this means (H-1.5)*(W-1.5)*(L-1.5)=2.004 ft^3 right?[/B] (using 3/4" MDF) [/QUOTE]

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