Cutting holes in rear deck - Does it help much??? - Chevy Impala SS Forum
 
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post #1 of 9 (permalink) Old 07-17-2003, 11:45 AM
SSuspect
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Hi all,

Well my system is in with the exception of the head unit (using line convertors from the stock cd deck).

I will add another post and pics a little later detailing the whole system, but lets just say that my trunk looks a lot different than it used to!!! Pretty cool setup...

I have 2 JL 10's (W-0's, had them in my truck and they did really well). I built the boxes with 3/4" MDF. I'm driving them in series with a bridged Infinity Kappa amp (300w - bridged). They hit pretty good, but was wondering is I should cut some holes in the rear deck to allow more bass to flow through. I have to pull the rear deck cover off next week to tint the rear window. I have heard mixed opinions.

Will it make much of a difference or will it just make me feel bad for chopping up my car?

I know that I can upgrade my subs and amp, but would rather put some money into intake and exhaust stuff. I don't need to be heard blocks away, but just wan't good quality in the car.

Thanks guys - I appreciate any input that you can provide...
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post #2 of 9 (permalink) Old 07-18-2003, 08:07 PM
Elemental
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or....take out the rear 6X9's and get a good front stage setup. i personally haven't had any rear fill in my car stereos in about um, 6 years lol and i never missed it.

still workin on the system in my car but with the 6.5" Memphis components up front and each side receiving 200W RMS it's MORE than enough to fill the cabin. No subs yet (broke ) but once i get at least one in should be very nice sounding (even for an SPL competition setup hehe).

i had one of my old 15's in the trunk in a ported box with 400W on it (sub handles over 2000W RMS...wasn't even pushing it) and to be honest i never could tell a difference from when the back seat was in and when i took it out completely. weird...usually doing that helps alot (or i've gone really deaf lately).

I wouldn't cut holes yet...yank out the 6X9's (you know how to remove the rear dash to get to em? let me know) and see if that helps. If it does, then i'd more seriously consider cutting holes...if not, leave the rear deck alone.

and if you DO cut holes...be sure and recarpet the rear deck so it looks nice, just be sure to use grill clothe or something equally air permeable so you're not restricting air flow (the whole point of cuttin the holes in the first place [img]smile.gif[/img] ).
post #3 of 9 (permalink) Old 07-21-2003, 07:10 AM
WILDSS
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Depending how much air your moving the cutting is a must. Im waiting for the new 1500 series carpet to come and im hacking up the rear. Im not sure if your noticing anything of the sort but i have a couple signs that porting is needed.

The rear fenders flex in/out, & if i drop the rear armrest theres a noticeable difference.

Also if you do a search I believe Jayo picked up more a couple DB's by cutting up the deck. A smart person will find a solution to hidding any modifications to the deck. The carpet should hide the hole all you need to do is keep it from saggin. If you want to get crazy get a nice grill made.
 
post #4 of 9 (permalink) Old 07-21-2003, 08:38 AM
catdaddy
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I wouldn't cut up my car to make a pair of W-O's sound better. W-O's are the base level subs offered by jl audio and are made to sound good with low power, so if you need more bass you may want to upgrade your subs and amps. what size box did you build? is it ported?
post #5 of 9 (permalink) Old 07-21-2003, 09:47 AM
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All - Thanks for the input!!!

I'm thinking that the boxes may be my main issue... They are only about .8 cf each and not ported. The previous box I had was substantially bigger and was ported. It pounded really well, but it was int he cab of my truck and there was no "blockage". I can upgrade the subs, but I think that I'll just build some bigger boxes as a test.

I currently have MB Quart 6.5 components in back and Infinity 4x6 "plate" seperates up front (each set powered by seperate amps). I am running everything through a small Kenwood EQ (which tucks VERY neatly in the center console).I did a full trunk "re-model" with hinge panels and side panels that all of the amps, crossovers and distribution blocks are mounted on. It is a pretty clean setup. I was trying to keep my trunk "usable" and still have plenty of room for my spare and a suitcase or 2. Hell, I even have the cargo net still in place!!!

When I have the trunk open and the system is cranked up a bit, the neighbors are a little edgy. Plenty of sound this way, but when I close the trunk, it just doesn't cut it.

I am taking the rear carpet out Wednesday night to get the windows tinted on Thursday. If I do cut the holes, I was going to cover them with metal screens(thick stuff - not door screen) to ensure that the carpet does not sag. Besides a few sheet metal screws, I was going to use some sort of RTV to ensure that they stay in place and do not rattle.

I am going to replace the head unit within a couple of weeks. This should have a dramatic effect on the overall sound quality/clarity.

Keep sending me some input. Maybe I can combine all of it and get some new ideas. Thanks for the help!!!

TR
post #6 of 9 (permalink) Old 07-21-2003, 11:18 AM
Elemental
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definitely port them if you want more output. But make sure it's correctly built, a badly built ported box can be worse than a properly built sealed box

as for cutting the rear deck, it doesn't matter what kind of subs you have...the point is to improve the sound you already have be it W0's or W7's. Either way you might be restricting bass flow into the cabin...why should it matter if it's a $100 sub or an overpriced $700 sub? Sound is sound...do what you can to get the most from it [img]smile.gif[/img]

Or....do like i do and get rid of the back seat, build a wall and put lots of power then again...that can severely hamper the quickness and agility of your ride lol. Only recommended if you compete on a more serious level or are a true basshead lol

also, the metal grill to keep the cloth from sagging is a good idea, just remember to use as thin a carpet as you can. If the carpet is thick enough it will restrict the airflow just as bad as having the entire rear deck in place, effectively negating the point of cutting holes. I had this problem once years ago when i had 3 12's ported thru my rear deck in a corolla. Carpeted over the holes and lost a TON of output...cut the carpet out over the holes and it was a night and day difference

sounds like you got a nice install going [img]smile.gif[/img] you might want to consider breaking out an air saw or something though so you can fit 6.5's in the front doors. It's really easy and there's not that much cutting required. Pull the plastic trims out for the 4X6's and mark off the metal that needs to be cut. I think i only cut two pieces off of each door, less than a 3/4" wide at the widest point. Did it in about 10 minutes with the air saw at the shop...tin snips would prob work since it's not alot of cutting. You'll get more midbass response out of 6.5's and can prob run more power to em if you want [img]smile.gif[/img]
post #7 of 9 (permalink) Old 07-21-2003, 11:23 AM
Elemental
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just added some pics of my components to my yahoo photo albums...there's one pic of the mid mounted in the door
http://photos.yahoo.com/edesignSPL

click on the one that says "6.5 inch Memphis components" ($400 retail...ouch, thankfully employee discount was available lol)
post #8 of 9 (permalink) Old 07-21-2003, 11:41 AM
WILDSS
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Yeah one way or another the sound has to get into the cab. The seats are thicker then chit, and the rear deck wont get you far. Regardless it will NEVER sound as good as your truck did unless you push more power and switch subs along w/ porting. Im runing 3 12 W3's in a sealed enclosure and like i said I have a huge problem w/ the sound not being where it should be. The theory still stand no matter what you running. If your going to port the box you should think about having the ports come out of the rear deck. I didnt think id have a huge problem w/ the sealed enclosure but i was only fooling myself.

As for the MB Quartz put them up front, do whatever it takes. I have had two sets of 6.5 components up front and i NEVER had to cut anything the woofer fell right in place as you can see from the pics on sounddomain, and i mounted the tweeter on the door skin, and had room for the crossover in the door. You will get a much better sound image w/ the components then w/ the 4x6's.

Check out my install if you get a chance.

Jim
post #9 of 9 (permalink) Old 07-21-2003, 12:41 PM
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Cool!!! Thanks for the additional info guys. I think that this will be another one of those "ever changing" projects. I will upgrade the front speakers after I get the head unit, intake kit and exhaust done. The issue here is trying to convince my wife that these things are more importent than school clothes for the kids ...

Regarding the comment about porting the boxes up into the rear deck, this is something that I was thinking about already. A buddy on mine has a single 12" with the port into the car and it hits AMAZINGLY hard... Just another thing for the drawing board...

I think I'll start with the boxes. $30 bucks for another sheet of MDF, some material, port tubes and some time... No big deal...

Thanks again for the input....

TR
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