2nd Gen Non-Engine/Transmission Replacing Infinity Speakers/Amps

[BMelhuish]

In 2012 I replaced the OEM Infinity radio and replaced it with an Alpine head unit. I did not replace anything else. I now want to upgrade the speakers. There is nothing really wrong with the system. I'm just looking to upgrade the sound quality.

The front speakers each have an amp attached to them that I think I can reuse. I plan on replacing the speakers and remounting the amps in an out of the way position on the door.

I know how the system works in gross, but I'm not very knowledgable of how the system components work together. I've read a few posts and threads about matching components that frankly is over my head. Has anyone done this? Advice?

 

[Road Dog]

If I was replacing mine I would take the amps out. The Alpine head unit is probably 40W/channel which is more than the stock Infinity Amps (20W). Taking them out is all about wiring. Each door has a 2-channel amp that drives the front door, rear door and I'm not sure how the A-pillar tweeter fits into it. It's probably in parallel with the front door speaker. Or there might be a crossover (filter) to limit the tweeters to high frequencies.

As long as the front speakers are the same and the rear speakers are the same then it should be good. I would put good quality 2 way speakers in the front doors and see how that sounds. Adding a powered sub-woofer would have the biggest impact on the sound. "Regular" speakers roll off around 100Hz which means you don't hear the bottom two octaves of music which means you don't hear instruments like a bass guitar.

 

[BMelhuish]

I was going to replace the OEM speakers with some fairly nice Alpines. The fronts are 3 way and rear are 2 way. The amps in the doors run both the 6 x9s in the front doors and the A pillar tweeters. I understand that there is a cross over for the tweeters. The amp in the head unit runs the rear speakers. I don't quite understand what you mean by rolling off. I'm not sure my ear is discriminating enough to tell minor differences in Hz. The head unit allows me to adjust bass etc over a fairly wide range.

Thanks.

 

[Road Dog]

"Rolling off" I mean the drop frequency response. On this chart the speaker starts to roll off around 70Hz. The bottom key on a piano is 27Hz and the bottom string on an electric bass is 41Hz.
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[BMelhuish]

Thank you. It works. I mounted the amps in the front of the doors next to the speakers. The sound quality is very much improved.