fastboydave

.... the subwoofer 'vibrates' at certain bass frequencies.

Yes I think that's it's purpose ;)

Seriously though. Sounds like either s fitting is loose or the woofer coil is on it's way out because it's been overdriven.

Thanks Scouser for those words of wisdom! :-)

Have been in contact with Bose actually and they assure me (ofcourse!) that they have not seen any problems with their system such as described. Dont think its the colis as when i hold the box it stops, if it were, wouldnt it continue?? Dont know? As you have suggested (and Bose) it could be surrounding trim (possibly panel underneath?) and at the weekend i will have a good look...... maybe Dynamat time????

Hi all.

I've had a look through the 996 forum and havent found anything about the problem i am experiencing. I have the BOSE system installed on my 996 TT and the subwoofer 'vibrates' at certain bass frequencies. It appears to be the 'casing', as when i put presure on it (push down) or push a screwdriver between it and the carpet underneath the 'vibration' goes away. I experienced similar on my previous Boxster S with the BOSE optional extra and it did my head in!

Has anyone else experienced this? Can anyone recommend anything? At the end of the day, this is supposed to be a decent system and it appears that there is (in my opinion only) a design flaw if it cannot handle the bass it is designed to handle. The bass is set to neutral on the head unit and loudness off, so i am not even 'pushing it'.

Any suggestions will be very much appreciated.

Thanks,

Dave.

While we're on this topic, I checked with the dealer about an alcantara headliner for my 99 C2. Their retail on it was in the neighborhood of 1500 dollars, just for the part. And, it was for a 2000 model, none listed for 1999. Does anyone know if there was a difference in the headliners from year to year for the C2? And, does anyone know where I can find one for something significantly more reasonably priced? :D

I dont know if the headliners are different for the newer models (i suspect not) but have you tried a Porsche dismantler? Is your location in the States? Have a look on www.911pcar.com, they seem to have a comprehensive stock and you may find what your looking for in good condition?

Removing interior light cover

1. Using a small screwdriver, carefully unclip both cover lenses 1 at the openings provided.

2. Undo fastening screws 2. Unclip cover 3 at the rear left and right, push forward towards the windscreen and remove.

3. Disconnect the electrical plug connection of the sliding roof rocker switch 4 and the interior light 5.

Removing sun visors and brackets

Unclipping front plastic lining

1. Undo fastening screws 6 in the plastic lining 7 at the front and unclip the lining out of the cowl panel frame 8 in a downward direction at the left and right.

Detaching roof liner at sides

1. Unclip the metal strut of the roof liner 9 from the plastic clips 10 at the right and left.

Disengaging rear plastic lining

1. Pull the rear plastic lining 7 towards the rear out of the roof frame 11 evenly on the left and right and disengage.

Disengaging metal strut

1. Pull the metal brace 9 contained in the fabric pocket down in the center so that it bends. Pull the metal strut 12 out of the bracket on the left and right.

Disengaging frame

1. Pull the frame of the sliding roof cut-out 13 backwards and downwards in the center at the front so that the frame overlap at the corners is reduced and it is possible to pull it out in a downward direction. Then pullout the roof frame diagonally via the sliding roof cut-out inwards into the passenger compartment.

Install is the reverse.

Loren, you are the man! Very much appreciated, nice one!

Try searching for "headliner"

Did do a search before asking and have done one again in the 'top level'. I dont see any step by step instructions only bits and bobs, some from yourself.

Can anyone help with detailed instructions and/or diagrams of how to remove the headliner?? I have a sunroof if that makes any difference??

The reason for removing it is unwanted 'rattles' when driving over bumps in the road (sunroof plastic rear wind deflector rattling on metal of roof i think) and vibration from Bose speaker on headiner above rear screen.

Would assume headlner out is the only option to fix this?? Doing my head in, please help???? :(