First off I just want to say how glad I am to find a forum dedicated to Jeep audio. You guys really seem to know your stuff. I didn't know about all this 4-5 years ago when I upgraded my stock system.
Here's the deal: I live in Miami, so going stealth was a priority back when I decided to upgrade. I didn't think I could get away with sub boxes since I have a soft top, and sometimes no top at all. What I ended up doing was replacing the head-unit with a Pioneer DEH-3700MP (22 watts RMS/50 peak x 4):
Pioneer DEH-P3700MP CD receiver with MP3 / WMA playback at Crutchfield.com
I swapped out the dash speakers with 5.25 Infinity Kappa 52.71 Coaxials (2 ohm, 55 watt RMS):
Infinity Kappa 52.7i 5-1/4" 2-way car speakers at Crutchfield.com
In the factory soundbar, I threw in a pair of 6.5 Infinity Kappa 62.7i coaxials (2 ohm, 75 watt RMS):
Infinity Kappa 62.7i 6-1/2" 2-way car speakers For 6-1/2" and 6-3/4" openings at Crutchfield.com
(I also took the soundbar off, flipped it around and placed it on the INSIDE of the rollbar since I have a Bestop Halftop and needed the speakers inside the cab)
I realized that the sound bar is the worst place to put good speakers because it's right by your head and it ruins the stereo image, but the great thing about the Pioneer HU is the "Front Image Enhancer" a.k.a. internal crossover! I was able to send ONLY 160hz and below to the soundbar acting as my "subwoofer".
My rig did the job well enough I suppose, even though the imaging sounded a little unusual, but it was WAY better than the stock setup I had before. The problem is that what little bass I had completely disappeared once I got over 50mph. Because my spiffy Kappa speakers were underpowered by the 22 watt HU, I ended up slightly blowing the right speaker in the dash
when blasting the radio on long distance trips. Also, over time, with people hitting their heads on the tweeters in the soundbar, the tweeters got knocked loose and I was too lazy to resolder the resistors so I just yanked the tweeters clean off since I was using those 6.5's for bass only. Now I just have some ratty wires sticking out of a grill-less woofer which is great actually because any possible thief passing by would take one look and think I have a POS ghetto system!
But after finding this forum, I'm all inspired to kick it up a notch! I'm still undecided about getting a sub, so I settled on an intermediate step: I ordered a 4-channel amp, the Eclipse EA4200 (60 watts x 4, 140 watts bridged):
Eclipse EA4200 EA Series 4-channel car amplifier 60 watts RMS x 4 at 4 ohms at Crutchfield Signature
I picked this one because it is small enough to fit under the driver's side seat. It also has adjustable crossovers for both front AND rear channels.
Anyway, if you've read this far, here are my questions for all you gurus:
1) I found out my head unit only has 1 set of RCA pre-outs.
But I can't find anything online or in the manual that tells me if this is a pre-out for a subwoofer or if it is a full-frequency pre-out. I'm going to guess that it's an all-purpose pre-out, but if it is, can I use Y-adapters to feed both front and rear channels at the amp?
2) I realize that the amp is only going to give me a modest bass boost at best, and that the amplifier is more about volume. Apparently, the big achilles heel with Jeep audio is that the dash speakers are basically hanging in mid-air with no enclosure. Yes, I tried stuffing poly-fill back there, but that barely helped. (And by the way, DO NOT use the foam baffles Crutchfield sells for your dash speakers, they make 'em sound worse). My Kappas, even at their best, had little to no mid-bass. Does anyone know of somebody who built in-dash enclosures? Yeah, I know about those Pod things, but those would get stolen in a heartbeat where I live. I'm all about stealth.
3) The Kappas in my dash are nice and have crystal clear highs, but they are a little bright for my tastes. Since I plan on replacing them soon, do you have any recommendations for 5.25 coaxials that have at least a little warmer, bassier sound? I'm leaning towards these JL Audio C2-525X's:
JL Audio C2-525X Evolution Series 5-1/4" 2-way car speakers at Crutchfield Signature
At 60 watts RMS, they perfectly match the Eclipse amp.
4) I don't plan on replacing the Kappas in my soundbar anytime soon since I'm just using them as woofers (and unlike my in-dash Kappas, they aren't blown
). They are 2-ohm 75 watt speakers, and according to Eclipse, the EA4200 runs 70 watts at 2 ohms so they match perfectly. But is it a bad idea to run 4 ohm speakers in the dash and 2 ohm speakers in the soundbar? Would it hurt the amp?
Well, this is getting long enough so I'll stop here. I'm sure I'll have more questions as they come to me.
TIA and Merry Xmas!