This 1989 Porsche 911 came to us for sound system upgrade. Old 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

Porsche 911 sound system

Porsche 911 sound system

Porsche 911 sound system

Also, this car has a very strong “Old car” smell. So we have to remove old and wet insulation and put new one. It took us two days to clean the floor, side panels and rear shelf.
Porsche 911 sound proofing

Porsche 911 sound proofing

Porsche 911 sound proofing

Porsche 911 sound proofing

Porsche 911 sound deadening

Porsche 911 sound deadening

Porsche 911 sound deadening

Porsche 911 sound deadening

Someone ran the wires for security system through the speaker hole…
Porsche Oakville

Porsche Oakville

So now we will start sound proofing. STP sound proofing materials for best results. Three different layers.

Floor panels covered with STP Bomb Aero
Porsche 911 sound deadening

Porsche 911 sound deadening

Porsche 911 sound deadening

Porsche 911 sound deadening

Rear deck and rear seat panels covered with STP Black Gold

Porsche 911 sound deadening

Porsche 911 sound deadening

Porsche 911 sound deadening

Porsche 911 sound deadening

Porsche 911 sound deadening

Front doors also covered with STP Black Gold.
Porsche 911 sound proofing

Porsche 911 sound deadening

Second layer is a STP Aeroflex

Porsche 911 sound deadening

Porsche 911 sound deadening

Porsche 911 sound deadening

Porsche 911 sound deadening

Third layer on the rear deck for rear speakers is a STP Bimast Wave 15

Porsche 911 sound deadening

New front speakers Focal ES165K Kevlar series secured to the metal
Porsche 911 speakers

Porsche 911 speakers

Rear speakers Kenwood 5×7 with clean looking Morel grilles

Porsche 911 speakers

New amplifier Focal FPX4400SQ in the front
Focal amplifier

And as usual here is some videos