C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette
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1974 Speaker replacement

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Old Feb 3, 2012 | 06:36 PM
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Will's'74VetteL-82's Avatar
Will's'74VetteL-82
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From: Pennington NJ
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Originally Posted by LSH77VETTE
Hi Will,

Yes, the Infinity Kappa's are some fine speakers. The 4X6's won't handle a ton of bass (but you will find that no 4x6's will regardless of brand), but with some adjustments to the head unit and amp, it is surprising how much volume these speakers will put out. We switched the JL amp that is powering them to the high pass filter, then tweaked the gain **** until we were able to play the stereo with wide open volume with no distortion. These 4x6's will deliver a good crisp quality sound. To compliment them, we have a set of Pioneer 6x9's behind the seats and a 10" Rockford P3 sub which are both being driven by seperate amps. It sounds unbelievably awesome. Back to the Infinity Kappa's, I would recommend them. They make some quality stuff. You can find them on Ebay or places like Techtronics for pretty cheap ($40 to $60 a pair).

Regarding the dash removal, I think you will find as we did that it is not as bad as you think it will be. Just take your time and enjoy the project :-)
Ok cool, I'll look into those speakers. When I build my full system when I rebuild the interior, I am going to do a similar setup with the multiple speakers/amp.

Originally Posted by 7T1vette
You don't need to re-drill the dash pad at all for new speakers. The speakers mount in the [removable] support frame. So, you mount the new speakers to that frame, then just install the assembly to the bottom of the dash pad via the 4 studs/nuts.

If the hole pattern in the new speakers will not match up with the speaker support, just use a pencil type soldering iron to burn new holes in the [plastic] speaker frame so that they will mount up OK.
Ok yeah I understand how the speakers mount, hopefully I wont need to mod anything but I dont care about cutting the speakers, but I'd prefer not to cut the dash. Looks like I shouldnt need to.

I am currently having some trouble getting the passenger side A pillar top screw out and the rearview mirror screw out (not that I need to remove that, but I'm going to POR 15 the rear of the Birdcage while I'm there) Any advice on getting PB blaster in there? I shot in around and on the screws themselves and behind any crevice I could find, along with shooting it into the removed screw holes. Hopefully tomorrow morning they will be easier to remove.....I put like 100 ft lbs of torque onto them and they didnt budge!

Thanks for the info....I'll keep you guys posted
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