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  #1  
Old 08-04-2016, 06:01 PM
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System finished: Review

So the system is finally finished.

Gear:
JL Stealthbox
Alpine PDR-v75
infinity Reference REF-6520cx 6 3/4 90 watts RMS (270 watts peak power) 3ohm
infinity Reference REF-9620cs 6x9 125 watts RMS (375 watts peak power) 3ohm

Review: What a nightmare trying to dial all this in and get it sounding good. Probably spent close to $3k.

After the install of the PDR-V75 I found out there was a recall on the amp. So I took it out, bought the Alpine PDX-V9 (supposedly a better amp, 100RMS x 4 + 500RMS sub. Bottom line, I could not dial the Alpine PDX-v9 amp in, everything sounded muddy, could not get the front 6x9's to blend well the the JL sub. Spent hours, adjusting the LPF and HPF.

Finally I called Alpine to check on the PDR and turns out mine is in the clear. The PDR sounds so much better than the more expensive PDX. the PDR has a LPF slope of -12db where the PDX has a slope of -24db. So a steeper slope in theory should sound better because you can tune the 6x9's and sub closer together, but never got it to work for me. Also the PDR has a bass boost, which I have just under 3db, the PDX does not have a bass boost. Long story short, the blend with the PDR is much better, don't know why, but it is. Mid bass on the 6x9's is also much better with the PDR - doesn't sound muddy - balanced and tight.

Settings are:
LPF 80hz subsonic 25hz -12db slope
HPF front 6x9's: 100hz
HPF rear 6 3/4": 120hz

The infinity tweeters, center channel, and d pillar speakers are being run off the factory amp.

I originally had the tweeters running off the 6x9 using the infinity cross over but it sounded too flat, there were no highs, I suspect that the 6x9's from the factory is not full range. I had the crossover on the infinity set to +3db. Once I put the tweeters on the factory amp they really came alive, however they are almost too bright, i have the treble on -9. Mids on -6 and bass on +2.

After all this work, I wish I just left the stock system. Not sure if it was worth it. However, I forgot what the stock system sounds like, so probably just keep it and leave it.

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Old 08-04-2016, 07:29 PM
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Re: System finished: Review

Too bad after all that work and money your not happy. That's a bummer!
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Old 08-06-2016, 08:54 AM
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Re: System finished: Review

Quote:
Originally Posted by Seandmac View Post
So the system is finally finished.

The infinity tweeters, center channel, and d pillar speakers are being run off the factory amp.

I originally had the tweeters running off the 6x9 using the infinity cross over but it sounded too flat, there were no highs, I suspect that the 6x9's from the factory is not full range. I had the crossover on the infinity set to +3db. Once I put the tweeters on the factory amp they really came alive, however they are almost too bright, i have the treble on -9. Mids on -6 and bass on +2.

Greetings,

This is a classic problem with running in conjunction with the factory DSP/Amp. Hope is not lost yet. It will require to spend some more money and working it in phases if want to go the full route. One of the questions you must ask your self is want do want the surround sound to be configured as? The other question is, how important is the rear door in the surround sound placement? I would seriously look into get an aftermarket DSP that will be using in addition to the factory DSP.

In this phase you are going to concentrate on integrating the gear you purchased for your upgrade and cleanup the front door and sub. This step requires that you sum the front door speakers both midbass & tweeters and the sub woofer channels to get a complete full range signal. It is here that I would use the washing machine to cleanup everything. The JL Audio FIX-82 or FIX86 depending how you want to configure the system:
FiX-82 - Car Audio - Processors - OEM Integration

FiX-86 - Car Audio - Processors - OEM Integration

With the FIX-86 you can run the outputs directly into the Alpine PDX-V9 with out having the amp split the signals internally. With the FIX-82 the internal split will have to happen.
That being said about the washing machine, in either case, you are going to use the Infinity crossover supplied with your kit. At this stage you are only get a flat signal with no equalization since the washing machine is taking out the eq, time delay and xover settings. The only control you will have to use xover from the amp. My recommendation now would be to try it and determine if you like t he sound or not. This would be consider the first phase.

The second and other phases are if the first phase is not good enough. Here again, a 2nd aftermarket DSP is needed for the fine tuning. The 2nd DSP is connected right out of the 1st DSP outputs. For this stage, the concentration is going to be with the front door and subwoofer. Here, you can work in better crossover parameters and some eq if needed. Moreover, the time delay can be played with between the sub and the front door where you can the sub feeling that it is in the front of the JGC.

With regards to the rear door, going back to my earlier question on where you want the surround placement, it is at this point you can have running off the 2nd DSP since it would be connected right out of the 1st DSP or run it off the factory DSP directly into the 2nd DSP using the a hi-lo connected of the factory speaker line.. In either route you take, with the signal going into the 2nd DSP, again you can have control of fine tuning.

As for the next phases, depending on the 2nd DSP you purchase and number of output channels still open, you can tackle the center and D pillar speakers. A small 4-channel amp would be needed. And of course if want complete the distance, just change out the speakers as well.


Hope is not lost yet. As I said, you have to spend some more money. If you are going to keep your JGC for long time, then you might want to serious think if it is worth going the extra few yards.

Best for now.
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http://www.jeepgarage.org/f155/2011-...ver-79121.html
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  #4  
Old 08-06-2016, 01:52 PM
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Re: System finished: Review

Thx for the info. I was looking at the jl dsp line, at this point it's just too much money and it's not worth it to me. I'm going back to stock.

One thing I hate is that for almost every song I'm adjusting the remote sub control.

The stock system is sufficient for my needs. It's a somewhat muddy system but gets the job done and doesn't have to be managed every second with the eq.
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