Quick newbie question port calculation |
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Ben W
Registered User Joined: 27 December 2010 Status: Offline Points: 43 |
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Posted: 28 August 2011 at 2:52pm |
Hi all,
Just finishing my reflex bins. I've been using WinISD pro but stumble upon one question. Does WinISD subtract the volume displaced by ports from vb as it calculates them (as BBpro does)? I don't imagine it does because it doesn't request the panel thickness. Until I calculate Lv, can't subtract vol from vb - but need vb to calculate lv Can you help me tune my cab? (Lv) Vb is 201 litre (taking volume displaced by driver and all internals except ports (not yet known) Ports are 3x 120mm ports with one flared end Baffle is 36mm desired fb is 40.7hz Thanks in advance for any guidance Ben Edited by Ben W - 28 August 2011 at 3:19pm |
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Meat
Old Croc Joined: 05 June 2009 Location: Manc Status: Offline Points: 1514 |
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You won't get exact porting lengths from winISD or most other programs. Its a pretty crude guess that maybe gets within 5Hz most of the time. If you want accurate tuning you need to measure the minimum impedance of the speaker find out where its tuned, modify the cab then measure, repeat until you're happy.
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Don't test the champignon sound
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Ben W
Registered User Joined: 27 December 2010 Status: Offline Points: 43 |
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Ok. Thanks. I did assume it was an estimate.
Could you provide any information re: how to tune by impedence? For now I'll go with WinISD tuning. Thanks B. |
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