1989 Porsche 911 Carrerra Targa | Soundproofing and Car Audio Installation

1989 Porsche 911 Carrerra Targa | Soundproofing and Car Audio Installation

1989 Porsche 911 Carrera Targa system upgrade and sound deadening

This 1989 Porsche 911 Carrera Targa came to our partners from Altered Sound for sound system and insulation upgrade. Sound system was really old with CD changer and 25 years old Alpine V12 amplifier.

Old speakers. Two way coaxials and extra tweeter with OEM crossover. Front speakers secured to the door panel, not to the metal. That’s why it doesn’t sound good.


Also, this car had a very strong “Old car” smell. So they had to remove old and wet insulation and put new one. It took two days to clean the floor, side panels and rear shelf. Our materials were used to achieve best results - full three layered solution.


First Layer:

Floor panels covered with STP Bomb Aero our most lightest material to reduce the weight of a door and pressure on a hinges. 

Rear deck and rear seat panels covered with STP Black Gold or most popular material that that has a best-in-class performance and affordable price.

Front doors also covered with STP Diamond Aero 4.2 mm thick material to remove as much vibration as possible and reinforce the floor.


Second layer:

STP Aeroflex 6 mm was used around the car to keep most of a road noise away.

Porsche 911 sound deadening

Third layer on the rear deck for rear speakers: 

Installers at Altered Sound used STP Biplast Wave 15mm to ensure the best audio quality and remove all the unnecessary noises from the rear deck. 


New sound system:

New front speakers Focal ES165K Kevlar series secured to the metal.
Rear speakers Kenwood 5×7 with clean looking Morel grilles.
New amplifier Focal FPX4400SQ in the front.

 Contact Us for a quote now!