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Old 01-13-2011   #1
 
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Default Building first sq system. Advice.

I am in the process of sound deadening my Jeep cherokee. I have double layered the roof with b quiet and put a single layer everywhere else including the floor. So far I have a jl W6 10 in a sealed box and am planning on buying a set of Hertz 165 XLs for the front and running them off a Jl 300/2 amp. I will be running my sub of a Jl 500/1. and getting the Dex P99rs for my deck. I have been trying to do my homework and have been doing a lot of reading and just looking for a little advice or suggestions before I purchase everything.
Thanks for your help, Justin

Last edited by 99xjproject; 01-13-2011 at 09:31 AM.. Reason: spelling.
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Old 01-13-2011   #2
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Default Re: Building first sq system. Advice.

Sounds like a good setup. May want to to look at CCF for the trim panels, and some MLV for the floor, but your equipment choice seems to be a great platform!

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Old 01-13-2011   #3
 
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Default Re: Building first sq system. Advice.

Thanks for the advice! I actually put a few heavy coats of Herculiner on the floor over the B-quiet on my Jeep and took out the carpet. From what I have read It should help deaden the sound quite a bit to.
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Old 01-13-2011   #4
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Default Re: Building first sq system. Advice.

If you are going to use the P99rs, use enough amp channels to match the number of speakers. For instance you have 5 speakers, so you would get 5 channels of amplification; one for the sub, 2 for the tweets, 2 for the mids.

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Old 01-13-2011   #5
 
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Default Re: Building first sq system. Advice.

So is that like running them active then? I would gain a lot of tunability out of this correct?
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Old 01-14-2011   #6
 
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Default Re: Building first sq system. Advice.

Also how much power would they handle if i did so? I was looking at the JL HD900/5 or the Zed Leviathan to power it and bridging channels 5 and 6 for my sub. Any opinions on these? from what I'v read they are both pretty good amps but would 150 watts per channel blow my speakers?
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Old 01-14-2011   #7
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Default Re: Building first sq system. Advice.

Yes that would considered active. Yes, much more tune-abliity.
http://www.diymobileaudio.com/forum/...e-posting.html

Power is relative to frequency and speaker mechanical limits.
http://www.diymobileaudio.com/forum/...w-passive.html
Excerpt:
Quote:
Originally Posted by nineball View Post
i am sure crossing them would help with power handling but i really can't see it helping it handle 2.5 times the rated power. who knows, maybe it will be fine. maybe it will blow. to each his own.
Quote:
Originally Posted by MiniVanMan View Post
Test subject is a Dayton RS180-8. First graph is 75 watts. Notice Xmax limits excursion at 75 hz in this case. You'd want to cross at 75-80 hz.

Next is the woofer ran at 200 watts. Xmax limited excursion is at 100 hz. More than 2.5 times the power.

In either case, the power is dynamic and not continuous. So, the woofer would rarely see the full power in either case. What the 200 watts would allow is much more dynamic headroom for the full bandwidth of the driver. 80 hz bursts will be fine as you're still not even close to Xmech. Now, clip the amp, and throw an 80 hz sine wave on the thing, and the driver will cook really quick. But, being smart with the gains, and crossover point and you'll be fine.

Also those graphs are essentially, IB, with a Qtc of .5. Driver excursion is barely limited by air pressure. Create a well sealed off enclosure, and you'll have even better excursion potential.
I think both amps would be fine. The Leviathan is more versatile. Just compare the specs for the 2 and read reviews.

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Old 01-14-2011   #8
 
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Default Re: Building first sq system. Advice.



Thank you for all your help! I think I have much more reading to do. I think I will run them passive for now and maybe get a different HU.

Last edited by 99xjproject; 01-14-2011 at 04:08 PM..
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