mr babin this ones for you or anyone who is able to answer - diyAudio
 mr babin this ones for you or anyone who is able to answer
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 4th March 2012, 11:59 PM #1 russdeanlee diyAudio Member   Join Date: Dec 2011 mr babin this ones for you or anyone who is able to answer i was using your subwoofer enclosure calculator and had a question: i input: Height? = 16 Inches Width? = 28.5 Inches Depth1? = 14 Inches Depth2? = 14 Inches Wood Thickness? = .75 Inches Speaker Displacement? = 0.12 Ft³ Port Frequency? = 25 Hertz Port Diameter? = 4 Inches Number of Ports? = 1 Sq. Port Ratio H:W? = 1: calculate results: Box Front Angle = 90 Degrees Gross box volume = 2.712 Ft3 Net box volume = 2.581 Ft3 Port Length = 17.992 Inches Port Area = 12.566 Inches2 Port Volume = 0.131 Ft3 ok if i was to change: Port Diameter? = 2 Inches Number of Ports? = 2 resulting in: Box Front Angle = 90 Degrees Gross box volume = 2.712 Ft3 Net box volume = 2.681 Ft3 Port Length = 8.606 Inches Port Area = 6.283 Inches2 Port Volume = 0.031 Ft3 1st question is, port diameter is for a circle port correct? 2nd question is, would these two enclosure sound exact same? or would one of them have improved sound quality? If so which one? thanks.
 5th March 2012, 12:07 AM #2 Perry Babin   diyAudio Member   Join Date: Nov 2003 Location: Louisiana 25Hz is probably too low for a car unless you have a specific reason to go that low. The sound would likely depend on how much displacement you were getting from the speakers. More displacement causes more airflow in the port and at high power, it's possible that you could have a problem with port noise with the smaller port area of the two 2" ports. The round ports are supposed to be PVC or something similar. The calculator takes the port volume from the enclosure but does not compensate for the thickness of the port material. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links
 5th March 2012, 12:25 AM #3 russdeanlee diyAudio Member   Join Date: Dec 2011 its for a single 12" idmax dual 2ohm subwoofer and the recommended ported volume gross is 2.72 cu. ft. ported frequency 25hz port dimension is 4" i.d. x 17.5" long. i'm trying to get the optimal sound quality from these subs. so i would be better off with a 4" port instead of 2 - 2" ports? I placed the woofers in the center of the enclosure and was going to port 2 ports on the top side of the enclosure but if my sound quality will be affected will just go get a 4" port.
 5th March 2012, 12:33 AM #4 Perry Babin   diyAudio Member   Join Date: Nov 2003 Location: Louisiana If you're going to drive it with anything near rated power, I'd suggest using a 4" port. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links
 5th March 2012, 02:01 AM #5 russdeanlee diyAudio Member   Join Date: Dec 2011 would 2 - 4" port instead of having just one affect sound quality because the box i build doesn't have room to place a port that long. if it does what differences would i get?
 5th March 2012, 02:03 AM #6 russdeanlee diyAudio Member   Join Date: Dec 2011 nevermind i asked that question i realized it was stupid and i got mmy answer just now by using your calculator
 5th March 2012, 03:07 AM #7 DREW028   diyAudio Member   Join Date: Jun 2004 Location: chicago When I had mines in a ported enclosure that was 4.5cuft 2 3" ports tuned to 34hz. Bass was nice and deep powered by a 1001bd at 1ohm. Then I switched to a sealed 4cuft. They still sounded deep, less low end but played a wider rang of music. Now I have them in a infinite baffle through the back deck lid. I am very pleased and very surprised how much output they have. A lot less output on the low end but gaining my trunk space back was worth it. Chose the enclosure type suited for the type of music you listen to. Either way you can't go wrong, these subs will play nice in anything.

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