Best sub for free-airs? 2 or 4 subs? - Chevy Impala SS Forum
 
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post #1 of 4 (permalink) Old 06-06-2002, 06:57 AM
Knightshade
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Ok, I'm finally getting ready to upgrade my subs... (currently using 2 6.5" bazooka tubes running off an Alpine 2x35W amp... worked great in a supra, bit weak for an SS).

So I'm going with the baffle board/free air setup... I'm thinking the 10" JL Audio IB4s are the best free-airs around? If so, do I want 2 or 4? Any problems with getting the board cut for 4 and only using 2 holes at first? (dunno if the empty holes alter acoustics any).

And what amp do I want? the subs are rated 100W RMS...

Rest of the system is thus:
1 4x25 Alpine V12 amp (which I'm sure is putting out more than it's rated)
2 4x6 Alpine plate speakers in front doors (rated 40W RMS)
2 6x9 Alpine speakers in rear deck (rated 50W RMS)


Eventually I may upgrade the plate speakers to seperates and put in a bigger 4-channel amp to run the inside, but what I've got now already produces VERY clear sound up to the volumes I normally listen, it just lacks reasonable bass to match.

Sound quality is most important to me, but when listening to something like, say, George Thurgood, or Closer by NIN, the proper bass should be there.

Thanks for any advice!

ps- Any idea what a used Alpine 2x35 amp is worth? [img]smile.gif[/img]
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post #2 of 4 (permalink) Old 06-06-2002, 08:46 AM
Way2SSlow
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<BLOCKQUOTE>quote:</font><HR>Originally posted by Knightshade:

So I'm going with the baffle board/free air setup... I'm thinking the 10" JL Audio IB4s are the best free-airs around? If so, do I want 2 or 4? Any problems with getting the board cut for 4 and only using 2 holes at first? (dunno if the empty holes alter acoustics any).
<HR></BLOCKQUOTE>

I have 2 JL IB4's mounted in the baffle board. I have been very happy with them. As far as the 2 or 4 question, I cant really give you a good answer to that. It depends on what you like. If you are looking for thunderous bass that will blow your trunk lid off, then I dont think the IB4's are for you in the first place. I have two, and they add plenty bass for me, as I listen to mostly like hard rock, metal and punk rock.

<BLOCKQUOTE>quote:</font><HR>And what amp do I want? the subs are rated 100W RMS...<HR></BLOCKQUOTE>

I have a Sony that I picked up for cheap. It runs 280W RMS. It's the EM 1002HX. I just went with that because I was short on cash at the time, and it has gotten the job done for quite a few years now without a problem.
post #3 of 4 (permalink) Old 06-06-2002, 09:19 AM
gbelli
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Is it a typo, or do the IB4 subs have an 8ohm voice coil http://www.jlaudio.com/subwoofers/10ib4.html

I have an extra channel of a 4 channel amp and have been thinking about a single 10" freeair. It'll do 100w bridged @ 4ohms. I dont think that 50w RMS @ 8ohms is going to be enough 'juice'
 
post #4 of 4 (permalink) Old 06-06-2002, 04:24 PM
Steve Cornell
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IB or 'free air" setups in our cars can sound very good however they must be properly installed, if you don't totaly isolate the front wave of the woofer from the rear wave you will get cancellation.
so YES having 4 holes and only using 2 will not work, many people also seem to believe that just sticking a board in the trunk with speakers mounted is all that's necessary..... you need to seal the edges of the baffle board for optimum results....

Think of the trunk as a large sealed box, the front of the woofers need to fire into the cabin of the car, through the rear seat is fine but that area needs to be sealed from the trunk.
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