ammonman

I am starting to think about sound system options for the 928 now that I am getting closer to completing all the mechanical refresh. I have aftermarket Polk components in the doors and rear cargo area and 6" JL Audio woofers in the B pillars. The factory amp and head unit are long gone. There are crossovers in the doors and I assume they are present for the rear speakers. As far as i can tell the 6" woofers are direct wired to the head unit with no crossover.

I am looking at installing a small Alpine 4 channel amp in the original factory amp location. This one LINK I would use the pre-amp outputs on my head unit to drive two channels and connect this to the door speakers. I would connect the subwoofer outputs to the other two channels and connect this to the two woofers in the B pillars. The rear speakers would be disconnected per Hans' recommendation. Is this a viable system? I have not worked with external amp'ed systems so this is all new to me.

Thanks

Mike

Ducman82

Don't see why that would not work. Should be ok

Bill Ball

The JL 6" woofers will not woof much in the pillar location. I installed an earlier generation of these speakers. First you will have to cut/grind the structure behind the speakers holes to fit the magnets on these honkers. Also, the area behind the pillar is an open chamber. These speakers need an enclosure that is sealed or has only a small port. You need speakers designed for free air. There are some, but I gave up and added a small sub (Apline SBR-S83V ) that fit in the spare tire well and repaired the factory rear pillar speakers (refoamed) which provide good mid-bass in that location.

medipedicman

+1

Red Flash

Bill, Mike

First, thanks to Bill for his past commentary on speakers. Not only was it spot on, but did a lot to help speed up my final stereo install. I'll be posting more about that later!

Now, Mike, as to the amp, it looks good actually! Given your starting point with the original amp long gone, I would likely use it as well.

John

ammonman

Thanks for the info Bill. The speakers were already installed when I bought the car. I have had them out and it doesn't look like any hacking was done to give them sufficient room to fit.

As far as the amount of woof goes, I'm not looking for a big increase, just trying to figure out how to drive them with bass frequencies only. All the crossovers I've found are the size of an amp and I don't want to start modding the interior to install one. I am hopeful that the solution Hans is working on can be made to work on the '89-up cars. The speaker rings have already been hacked on my car so I not shy about hacking them some more to fit his units.

Mike

RKD in OKC

a JL 6 in subs in the 6 in door mount spaces, driven off the sub channel of the amp they worked great.

Bill Ball

The new JL 6 woofers must have smaller magnets than the old generation. It took quite a bit of grinding for me in my 89. I used some bad rear mount speakers as mounting rings, cutting the centers out. I was never happy with the sound of the JL's despite their sterling reputation and concluded the free air nature of that location was the problem. I have a bunch of other 6 to 6.5" woofers I tried, now sitting in boxes unused, including those classic JL's, a bunch of MB Quarts, and others I need to get up on eBay.

I run a 5.1 headunit (in 4.1 mode - never came up with a viable center channel speaker - tried many) and like a lot of now "vintage" DTS and DVD-A multi-channel material, so I need a full-range rear channel setup. The JL's with a tweeter would not provide that. I got closest with some old mid-priced MB Quarts and a lot of polyester stuffing the area behind the speaker, but ultimately went back to the stock (repaired) woofers with some other tweeters and a small sub (8" Alpine box noted above) and some Audiobahn 4" + tweeter drop-in replacements up front. Rocks the car very nicely - Tempus Fugit (from the DTS 5.1 release of Chick Corea and Friends, Tribute to Bud Powell) drum solo at high volume - WOW! Advice - even the 2-channel version of that disc is stunning. Good test disc with thumping, sharp drums and bass, rippling piano and bright horns covering a lot of sonic ground.

Andy Kay

Call around as I purchased that same amp, Alpine KTP-445 from a Best Buy on 03/09/12 for $90.99. It was $129.99 marked down as an in store clearance item.

Sean installed it w/o a problem. However, the wiring harness was not long enough to mount it in the same place as the factory amp so its right in front of the passenger seat and under the Lloyds floor mats. No issues with moving the seat either. Nice amp.

I don't think I'll get the bass response I want until I add the Sharkwoofer

Adamant1971

I just made a longer harness and she got right in the stock amp location. Mine is running a 6 speakers with no issues.

Alpine makes an 8" sub that fits in the spare tire well, or get the shar woofer. 6" will be like a fart in the wind.

SQLGuy

The Sony XM-4S will fit in the original location, and it's a pretty good little amp.

Chuck Schreiber

Does the Stock amp cover (carpeted), fit over that Sony Amp ok?