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I have 4 15W6 in a ported enclosure in an extended cab Ranger. The enclosure is tuned to 45hz. This enclosure provides a nice hump around 55-60hz. I received the info from JL Audio. I am using (2) 3inch ports, 8.5 inches long per woofer. Enlcosure size is 1.75 cubic feet per woofer after displacement. I was only able to pull a 149.8. I know I should be able to go higher than that. Any help would be appreciated. This is setup in a vertical wall.
P.S. If anyone is in the Illinois-Wisconsin area and want to attend a small SPL event. Absolute Sound in McHenry IL. (815) 363-0700. Saturday, October 23 10:00 am.
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I'd be doing some testing on the truck and see what your resonant is. You also neglected to mention what amplifiers your running, is it possible that you need more power? I think that 149.8 with 4 15's is not too terribly shabby... but you should be able to get more with some experimentation and the right note.
------------------ STILL waiting to hear a GOOD pair of HLCD's!!
If it dont fit, force it... if it breaks, it needed to be replaced anyway...
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I am runnin a pair of Crossfire 1000D's. I am presenting each amp with a 1.5 ohm load. How do I find my resonant frequency and what do I do after I find it to gain more SPL. Thanks for the previous and future. responses guys.
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Well if you find the Res freq of the car you Just burp the system for a second of 2 at that freq. You save power and the heating up of amps and subs. Also by fniding that freq you can increase SPL and save subs and amps.
Get access to a meter...or even buy a cheap radio shack meter...Play at a low level and see what freq your system is loudest at.
This is one way and you can find the res freq. I know it is not the only way..
------------------ _____________________ Member of "Team Underconstruction" Can you say 172dB outlaw 160's+ legal in a yugo? We can:-) 1999 USAC Finals Qualifier Usac Sactioned Judge -----Judged----- 1999 Spring Break Nationals 1999 Midwest Regional 1983 Camaro-152dB old system..new system on the way. -Irc Chat Room- chat.talkcity.com ports 6667,6668,6669,7000 Room Name #auto-audio I am the room coordinator for this room. Stop by sometime and say hi...We are busy after 9:00cdt usually.
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You can take measurements of your car to get the res of the car, then tune your enclosure to that freq. If you dont have a clue what your note is, you can run a sweep in the lane from about 100 down, hitting every cycle, very briefly. I dont like that idea, however, it ****s your amp dry in the process..
------------------ STILL waiting to hear a GOOD pair of HLCD's!!
If it dont fit, force it... if it breaks, it needed to be replaced anyway...
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My method.....if you've got a couple friends or if you build a car every so often is to go buy a cheap RELIABLE woofer of the 10-15" variety and play around with it until you get a nice flat response enclosure.....SEALED most likely. Turn off all Eq's, boosts, processors of any kind....you can leave your x-over, but bump it up to about 100-120 hz. Now, throw that box in your car in roughly the same location as your setup will be in....ie, firing off hatch, behind a seat, doesn't matter. Now go through and play individual tones from 35-85 hz at relatively low levels....less than 120 probably so you're not gobbling up power. Just follow what the meter tells you. If you've got a flat response out of your enclosure and play each individual tone you should be able to get a range which plays just slightly louder. If you've got a fairly large range, you might have to play it marginally louder and keep experimenting til you get those couple notes that play louder. More than likely they will be in a little group. Now you know what your box needs to be tuned to. Not rocket science.
------------------ Tim Dreager Autosound Audio Technologies Omaha, NE
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