i installed the stuff on sunday, couldnt find the camera otherwise i would have gotten loads of pics.. but tbh, sound deadening pics are all the same.. single layer of damplifier on the outer skin with enough to get a second layer just behind the midbass driver.. then a layer of overkill glued to the back of the doorcard..

the review is a little skewed as i flipped the phase on the drivers side midbass, so there would have been an instant increase in midbass there..

well basically, its great stuff to install, very easy although i still have loads of cuts and slices in my fingers from the sharp foil :eek:

the overkill needs you to add your own adhesive, i bought some heavy duty plastikote spray glue from hellfrauds and it worked a treat, overkill is very flexible and stretchy.. very easy to contour against anything..

now, my aim was two fold, to reduce the noise emanating outside the doors from the mids and, ofcourse, to increase midbass, particularly in the 50-200hz region..

there has definately been a gain in midbass in the 150-250hz region, although this could just be a result of the phase flip.. all in all, im a little unconvinced there was a substantial performance difference (arguably not an £80 difference anyway), however it does reduce some noise from the outside of the car..

i was a little confused with the overkill, i thought it killed all frequencies ie cancelling out the rear wave of a driver, but it is aimed at killing road noise, so in the region of 200hz iirc.. although as an ofshoot of its foamy nature, it has cured a few rattles, and im going to use it to help stop the infamous rear windows from rattling :lol:

so to sum it up, im not dissapointed, but a little unconvinced.. i've come to the conclusion that i will need a few more layers for the damplifier to make a massive difference, and i will definately need to do the inner skin coupled with the fact that the doors are already very thick and not as tinny as most other cars which is why i didnt see such a dramatic impact

i still have loads of cuts and slices in my fingers from the sharp foil :eek:


That made me feel :chunks: You know the foil they put over certain cartons with powder in? well i punctured one once and then ran my finger around the edge to flatten it down to the sides only to look away and then feel a burning pain as i realized the foil was now running through my finger and cut down to the bone :chunks:

anyway bit of usuless info but apart from that what made you chose those two to use?

anyway bit of usuless info but apart from that what made you chose those two to use?

i was going to use the sludge instead of damplifier, but i thought i would have enough damplifier to do the inner skin (which i wouldnt be able to do with sludge) but i didnt actually calculate how much i'd need and thus i ran out!! my aim was to add a little weight to the door skin to stop any flex and to stop any sound escaping through the door to the outside..

when you tap the door and compare it to the tap on a rear door there is an impressively strong thud from the front doors compared to the tinnyer thud from the rear doors.. unfortunately i dont feel this translated a difference in the drivers response from inside the car

the overkill was used as i felt it would help cancel out the rear wave of the mid from coming through the door card and thus increase overall response.. they do definately sound a little less muddy which i think is down to the overkill - i guess i should have added this part in the first post :)

biggest gain in midbass from deadening is from sealing the inner skin

biggest gain in midbass from deadening is from sealing the inner skin

does it have to be completely sealed to see a difference (ie no holes for wiring)?

biggest gain in midbass from deadening is from sealing the inner skin
That depends on where the midbass is mounted.

If it's mounted on a baffle which is attached to the inner skin then yes, it'll make a HUGE difference, but if the speaker/baffle is attached to the door card, all that sealing the holes in the inner skin will do is reduce the volume of the enclosure they're playing in, which will most likely reduce the bottom end. Sure you know that Andy, but just spelling it out for anyone who doesn't :)

Tej - I don't think the overkill will do particularly much to reduce the back waves from the speaker escaping - it's not thick enough to make much difference at low frequences like a midbass will play - it's more to reduce road noise I thought?

That made me feel :chunks: You know the foil they put over certain cartons with powder in? well i punctured one once and then ran my finger around the edge to flatten it down to the sides only to look away and then feel a burning pain as i realized the foil was now running through my finger and cut down to the bone :chunks:

anyway bit of usuless info but apart from that what made you chose those two to use?:chunks:

I couldn't concentrate on anything in this thread after reading that. :(

Great review Tej... Sound deadening cuts can be avoided by using a roller... I never used to until I did Mark's roof the other weekend... A proper adantage, gives better adhesion and no "battle-scars"... :)

does it have to be completely sealed to see a difference (ie no holes for wiring)?

The better sealed, the better the sound... You can't get it perfect on some cars, like you say due to wiring etc, but if makes all the difference!

Tej - I don't think the overkill will do particularly much to reduce the back waves from the speaker escaping - it's not thick enough to make much difference at low frequences like a midbass will play - it's more to reduce road noise I thought?

yes, it is a little thin, but having never handled it before i had no idea, but even then i though it was some sort of super duper sound soaking material..

maybe i just didnt read the blurb properly on the CAD site or just got the wrong end of the stick, either way i cant blame the product, and for the price it was well worth the reduction in rattles/vibrations of the door card.. it was the damplifier that left me with a bit of a "meh" feeling rather than the overkill..

ps. the mids are mounted directly onto the door card.. theres no contact/seal with the inner skin