Loudest SPL frequency

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=49074
Printed Date: May 08, 2025 at 7:23 PM

Topic: Loudest SPL frequency

Posted By: jvillefinest
Subject: Loudest SPL frequency
Date Posted: January 31, 2005 at 8:51 PM

I plan to make a ported competition box. Is there a way to find the Loudest SPL frequency when making a ported box.

Thanks

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2007 Acura TSX
SQ setup in the works

Replies:

Posted By: bullman96
Date Posted: January 31, 2005 at 9:13 PM

find the frequency for your car that has the most cabin gain

Posted By: jvillefinest
Date Posted: February 01, 2005 at 10:17 AM

I thought there was a way to take some of the specs of the speakers and then be able to figure the Frequency needed?

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2007 Acura TSX
SQ setup in the works

Posted By: jvillefinest
Date Posted: February 01, 2005 at 10:18 AM

and if the cabin gain thing is true how do you fingure that out?

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2007 Acura TSX
SQ setup in the works

Posted By: kfr01
Date Posted: February 01, 2005 at 4:02 PM

The cabin gain "thing" IS true. Different cars with different setups will boost / cut different frequencies. It would be impossible for me to tell you, "42.76hz" is teh elite.

Get an SPL meter at ratshack and some cd's with tracks at different frequencies.

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New Project: 2003 Pathfinder

Posted By: MAXST
Date Posted: February 01, 2005 at 5:05 PM

Find the cabin gain number then make a bandpass box. Comp only. since anything outside that hz range will sound like ass. Also its really hard to tell if the sub is distorting..

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I need quality equipment, feel free to donate.

Posted By: audiobass10
Date Posted: February 01, 2005 at 6:38 PM

Try finding a sub with an Fs closest to your ideal tuned frequency. then the sub is most efficient and the enclosure is most efficnet, combined, at the sympathetic frequency of the cabin.
lower the cabin frequency by sound deadening it to help achieve that matched point. Then, you need to find the peak efficiency point for the amplifier based on load as well as the enclosure and sub combination in the cabin of said vehicle.
this will help to get the most power out of the amp where the load drops to it's lowest point in the response curve, which you want to be about where the cabin gain kicks in for transfer point.

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Dave

Pioneer Premier DEH-P660
15" Kicker CVR
Profile AP1000M
It's Loud