After the
kicker speaker upgrade, it was obvious that a separate amplifier was needed. A regular recommendation on the forum is the Soundstream Picasso Nano 640D that I believe has recently been discontinued. I found a used unit with all the attachment cables on Ebay and ordered. 5 channels, small footprint and plenty of power.
The next obstacle was my 10+ year old head unit. It had only 2 pairs of pre-amp RCA outs; one for the front speakers and another set that could be set to rear or the sub. There may be other solutions, but I opted to replace the unit with another forum recommendation: the Kenwood KMM-X705 with 3 pairs of pre-outs at 5v.
The Kenwood install was easier expected. Crutchfield supplied all of the required parts. I had it done in about an hour. No real change in sound quality running from the built in amp vs the old Pioneer.
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The amp install was much more exciting. There are plenty of good examples on the forum (
here and
here are just two) for mounting the amp in the unused space under the steering column. The forum research and pre-planning made this install about as simple as it could be. I spread it out over a few evenings and had it ready to go for the weekend.
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I've only done some basic tuning and I am blown away. The sound is clean, the tweeters up front are fantastic, the $25 Goldwood sub sounds great and I can hear everything cruising with the top down. Special thanks to
@NashvilleTJ for
his write up on the Soundstream amp gain knobs - saved me a ton of time. A big thanks to
@skrelnik for his Jeep audio expertise that he so regularly shares on this forum.