Boring out speakers holes on rear bulkhead ? Bad idea ?

[poormansporsche]

on a W202. I was thinking of chopping the centre bit of metal out between the 2 rear speaker holes in the rear bulkhead to allow fitting of some 6 x 9's or the like.

is this likely to bugger up the structual integrity or anything - would a metal support need to be bolted on or anything ?? thoughts ???

this bit !

cheers

Brett

 

[Dieselman]

Add stiff board such as MDF as the stiffening plate. The stiffer and better damped you can make that shelf, the better the sound will be.

 

[Sp!ke]

I'm not sure that any 6x9 speakers are recommended by car audio folk.

 

[91dm]

As above, you can fit most 6.5" speakers in the original holes which will sound better.

 

[bolide]

Use woofers that fit the cutouts or build a plenum behind and mount them to that, "blowing" through the existing speaker holes

Strengthening the whole panel with MDF and deadening it with Dynamat, flashing tape, structural foam, etc, is a good idea. The woofers must have an airtight seal to the panel and, for best bass, you should block any other holes in the bulkhead

Nick Froome

 

[poormansporsche]

Cheers for the replies. I did try with 6.5's (in fact 2 sets one in each hole !) Run as woofers and Dynamat etc but was not happy with the base. I'm not a base head by any stretch but like a bit. Due to having a LPG and a boot full of spare wheel a sub is a no no. In my old clk I was running a pair of 8" free air woofers in the shelf and the base was more than enough. I have trial fitted the 8" woofers but the chopping of the bulkhead would be too much. I know 6 x 9s are not great but they are good for max base from minimum space.I've ordered 2 sets of 6 x 9 MDF spacers and I thought I might mount one set on the top of the bulkhead and one set below the bulkhead sandwiching 2 layers of Dynamat top and bottom. I'm not really that bothered about sound quality as will run as woofers and concentrate on getting the quality from the front components.

 

[Dieselman]

Are you using all four doors as well as that adds a surprising amount of bass from small speakers.

 

[poormansporsche]

The rear door speakers will be for the parrot use only. Haven't sorted the fronts yet.

Next question though is Dynamat actually more worthwhile than just using lead flashing at a third of the price ! Its not a high end install just want to stop some of the scuttle shake ??

 

[Dieselman]

If you put all the bass in the rear shelf you will have an uneven soundstage. Smaller speakers in all larger cavities will work a lot better.

 

[bolide]

If you put all the bass in the rear shelf you will have an uneven soundstage. Smaller speakers in all larger cavities will work a lot better.

Crossover the fronts at 100 Hz and the woofers at 80 Hz and I don't think you'll have a problem

Nick Froome