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Car Forum / Driving, Maintenance, Tuning / Car Audio / February 2006Port tube volumes
I am building a vented sub box. I purchased some port tubes from madisound.com. These are engineered tube with large flares at the entrance and exit of the tube to allow for smooth air flow. What I need to know is do I need to take into account the added volume these flared ends are adding when figuring up the port tube length. The spec sheet for the subs I'm using say to use 2in diam and 6.75in long tubes. Should I do the math and shorten the overall tube length because of the flared ends. > I am building a vented sub box. I purchased some port tubes from > madisound.com. These are engineered tube with large flares at the [quoted text clipped - 4 lines] > Should I do the math and shorten the overall tube length because of > the flared ends. I wouldn't worry about it; the difference is likely too small to be significant. --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 0608-0, 02/20/2006 Tested on: 2/20/2006 10:39:09 PM avast! - copyright (c) 1988-2005 ALWIL Software. http://www.avast.com There is actually quite a significant addition in volume, these tubes have decent sized flares. here is a link with a pic so you can see what i'm talking about http://www.madisound.com/cgi-bin/index.cgi?cart_id=3885018.2920&pid=1585 understand that the tube is only 2in in diameter and then look at how large the ends are in comparison. It's this difference that worries me. Since this is the first sub box i have ever built, i don't want to half-a.s it and have it sound like crap. > There is actually quite a significant addition in volume, these tubes > have decent sized flares. here is a link with a pic so you can see [quoted text clipped - 4 lines] > understand that the tube is only 2in in diameter and then look at how > large the ends are in comparison. Yes, but the plastic itself is not taking up that much volume. Really, it's not worth losing sleep over... if it were, I'd think the specs for the tube would list how much extra volume it takes. --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 0608-0, 02/20/2006 Tested on: 2/21/2006 11:47:43 AM avast! - copyright (c) 1988-2005 ALWIL Software. http://www.avast.com The flared part of the tube is really not part of the volume of air that makes up the port. It is there ONLY to reduce port-noise caused by turbulence. Think about it, at the point the tube starts to flair you no longer have restricted air-space. That part of the tube is doing virtually nothing sound-wise. I agree with Matt, don't worry about it. MOSFET >I am building a vented sub box. I purchased some port tubes from > madisound.com. These are engineered tube with large flares at the [quoted text clipped - 4 lines] > Should I do the math and shorten the overall tube length because of > the flared ends. What you say does make sense MOSFET. I appreciate both your guys help. |
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