1978 911 SC rear speakers

[opticalfuel]

Does anyone have experience replacing the stock speakers?

Which way do you access the speakers themselves, from inside the cabin, or engine compartment?

I also need to know what speakers are in there so I know what to replace them with. They are not sounding real good anymore.

I expect that they are 4x6's. Are they smaller than that?

[steve911]

Definitely from inside the cabin - you should have a sold firewall between you and the engine.

The grills should pop off and then there are 4 screws holding the speakers into the rear deck. Because of their location and the lack of depth, you'll not likely get great sound from the rear speakers (in fact they are wired for mono, not stereo sound, IIRC). I believe they were 4x6 from the factory.

I replaced mine with Kenwood 4x6 - do a search; there are a host of threads on speakers.

[ASD]

My 78 has a Plate type speakers in there, and there is not a lot of depth to put in much else. The are some good plate type spkrs out there for sale though noneI have seen will have much bottom end response.

[jshape]

I replaced mine with a pair of Blaupunkt PCX 462 that work just fine for my needs. I did have to cut out the factory grilles that were mounted below the leather perforations on the rear seat/shelf panel in order for the speakers to fit - and had to fiddle around with a couple of washers on the two (of the four) mounting studs that I used to mount the speakers.

[opticalfuel]

I have looked carefully at the interior. I don't want to damage the vinyl or leather.

My question is not so much what speakers are there or what to replace it with, as about how to access them so that I can replace them without fouling up the interior.

Is it possible to remove the rear panel/board deck without disassembling the upholstery?

I don't need the low end, but I probably do need to replace the speakers as they make a very irriating vibration noise, possibly as a result of being there for quite a while / direct sunlight ... etc...

[sraiken]

Maybe you have figured it out already but....you need to remove the rear interior deck that covers the speakers and then folds down to form the backrest for the jump seats back. There are two screws on the folded down part near the bottom. Then you lift that part up a little which lifts it off a hook that is monuted on the back of it and the inside body/firewall. Gentle pull it out working it away from the quarter panel interior pieces, disconnect the speakers and then it comes out of the car.
There is only about an inch and one half depth available for the speakers.

[Vipergrün]

I have a pair of decent 4X6 Polks you can have if you want them....just pay shipping. Lemme know if you want pics.

[randywebb]

Msg from a friend who is into high end audio re speakers that might fit:

If you are looking for a shallow mount speaker, check out the Eclipse entry level speakers. About $80-100 a pair, very efficient, and better sounding than many of the so called hi end car speakers out now. They aren't ADS speakers but they are much smoother sounding than the MB quarts, Infinities and other popular speakers.

[HardDrive]

The entire rear panel is held in with 4 screws. The back deck and the panel behind the rear seats comes out as one piece. You do not need to damage anything to get access.

Unforunately, there is only about 1.5 inches of space between the rear deck and the engine compartment. A very shallow, and thus not very power full, speaker must be used.

Or you could do what the previous owner of my 82 did, and hack them out with a hole saw....dear lord....

[opticalfuel]

Ok. Thanks for all the response.

This is why this forum works. I asked and recieved just the answers I needed.

I now understand the following:

1. The speakers are removable and replaceable without damaging the interior - by removing the four screws that hold in the deck cover.

2. Small, shallow, yet quality speakers must be the type I replace the original speakers with -- with the understanding that the low end must be supplied elsewhere.

3. There is a wrong way to replace the speakers - a 'saws-all' and a lack of patience.

THANKS AGAIN - ALL!

[fastpat]

I've been looking at a upgrade in audio equipment as well. My Carera is completely factory, Blaupunkt Charleston and stock speakers.

I'm thinking of upgrading to the new Alpine 9855, removing and replacing the speakers with a higher quality speaker of the same size in each location, and finding a good location for a smallish subsoofer.

[randywebb]

search on subwoofer and its spelling variants to find a lot of ideas on this. My favorite idea is the smuggler's box area. It entails the least compromise in wt. distribution.

[jcc911]

I am in the middle of doing the same and there are few things you must remember. The rear speakers are wired mono, so if you desire stero sound, you are going to have to run another wire to the rear of the car. The speakers are 4X6 metric and are so shallow that the magnet is mounted on top. I like you do not want to do any cutting so what Iam going to do is replace them with a high quality 4x6 but the trick is to only mount them diagonally, with two of the bolts. Both Blaupunkt and Kenwood make a 4X6 replacement and can be found at Crutchfield.
If any other questions give Rod Birch a shout at www.caraudioinnovations.com he is an expert in installing stereos into Posches.

[halbatross]

how to connect the rear speakers
extends backward only one cable

As for the original
930/79

Thanks

[75 911s]

If you scroll up someone says that the rear speaker came mono. So you either run new wires or you set the rear speaker up as a mono setup.

[halbatross]

Originally Posted by 75 911s

If you scroll up someone says that the rear speaker came mono. So you either run new wires or you set the rear speaker up as a mono setup.

Thanks, OK
It is to be mono, oryginall

but how to connect to amplifier


It has outputs only 2 speakers
front and rear mono?

[theiceman]

okay its been a while but i think i remember .. the factory stereo left and right go to the front speakers . I seem to think one of my front speakers had a "pigtail that allowed a wire to run to the back where those were hooked in parallel.

this was over ten years ago and i throw nothing out. If i can find the pigtail i will send a pic.
easiest thing is to run new wires and new radio really.

[422flat6]

Usually the only safe way to hook up multiple speakers to a mono output is to wire in series as per your post above. Wiring in parallel will most likely drop the impedance too low and burn up the amplifier in your stock radio. Check the specs on your particular equipment to know for sure.

The alternative is to install an aftermarket amplifier with enough channels to drive your additional speakers.

[halbatross]

Originally Posted by theiceman

If i can find the pigtail i will send a pic.
.

Thank you, that would be very helpful,
nobody knows

Originally Posted by theiceman

easiest thing is to run new wires and new radio really

new wires and new radio - not

must be original

My set:

[Dave Schnell]

If i could shed a little light on this the rear dck issue is already covered on r&r and the original factory speakers were Blaupunkt or later Nokia 4x6 with a 3/4" depth. 5" metric not 5-1/4 wre in the front doors. Radios were am/fm 4 or 5 pushbuton.
I was intrigued with halbatross"s wiring diagrams because in having rewired over 70/80 Porsche's in the last 25 years I don't remember ever seeing that configuration. i also don't mean to criticize someone going to such detail to be helpful but if we are going to put info out there that others are going to rely on we should collaborate with each other and bring to the table what we know from
experience in the trenches.
The oldest radios had 1 speaker in the dash under the upholstery . How stupid to this day that was. The amp was the smaller box you see in the pictures behind the radio. It had 8 watts.
Later radios had 2 x8 watts. Still later 4x 15 watts and then powered amps.
As far as the 1st diagram goes under the stereo he shows 2 speaker pins that were used exclusively by Blaupunkt & Becker. Each square connector has a flat pin (+) and a round pin (-)
for 1 channel. I have never seen only 1 speaker wire in the rear with + & - . What I have seen in some cars including Ford and the Ford Italia was a (Positive)2 lead wire going to the rear which was then split in two with ea wire going to an individual speaker . The speakers then had individual single wires running from spkr - to the chassis. This is called A COMMON GROUND. The front speakers on the other hand had a FLOATING GROUND or - & + together running to each speaker. There has never been a mono speaker in a car that had stereo. In the 30's and 40's were those available before FM stereo. Also if it was mono & in series there would only be 1 speaker pin.

When I look at the second diagram I see 2 pins 4ohms coming from the radio and going to 4
8 ohm speakers . Wrongamundo! Halbatross had it right in the diagram showing the speakers wired in series parallel. this drops the impedence to half the value or 4 ohms and the radio sees 4ohms. He is right on that score . Where the misstep is is that the radio was not 4 ohms. A 8 ohm radio has to see a 8ohm load . A 4ohm radio has to see a 4ohm speaker load . The other point I might make is that in the configuration it shows the radio as STEREO . Stereo has 2 distinctly different signals for right and left. With this diagram that would mean that the 2 front speakers
were L. channel & the 2 rear speakers would be R. channel and the balance control knob would be used as a fader instead. Hardly stereo! I've seen some pretty dumb things don By Porsche and blaupunkt but i don't think they would have done that. Let's see if we can fix this.

Take the right channel - &+ and connect to the R. ch front speaker also -& +
Now run a NEG & POS wire from the front speaker back to the rear speaker and reverse the leads
to POS / NEG. You now have two speakers on the right side F & R wired in series for 8 ohms
Do the same on the left. You now have 2 sets of 8 ohm speakers wired to a 8ohm stereo radio Ever seen a radio that had balance control and no fader. This is how it is done and so it shall be written.