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Old 02-06-2009   #1
 
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Default Alpine PXE-H650 and the C6 Corvette

First, I understand the factory head units in the C6 Corvettes have a nice unequalized line out that can be wired directly into an aftermarket amp and there's no need for a CleanSweep.

However, I plan to run a 5 channel setup with the following:
Stock radio head unit w/ 6disc in dash (Bose non-nav)
Single 10" IDQ sub (Boxology sealed fiberglass enclosure, powered by a JL 500/1)
Dayton 8" midbasses in the doors
Radian drivers in ID minihorn HLCD bodies
Front stage actively crossed over using the JL 300/4's onboard XO's
NO center or rear fill, just stereo front with a decent sub.

This is the same setup I previously ran in my BMW M3. I found that it was useful to have a head unit with a 7 band parametric EQ (I used a high end Eclipse) to tune the final frequency response with the horns and weird reflections. I plan to keep the factory head unit to avoid CAN or bluetooth (I have an '09) issues and retain the steering wheel controls/phone pairing, but I'd like to look at potential EQ'ing solutions.

I can either just add an inline EQ like an audiocontrol EQT or go with the PXE-H650. The Alpine appears to have the added benefit of time alignment and more bands at a reasonable cost. Has anyone used this first hand? Any drawbacks? and...

Is it possible to completely remove the factory BLOSE amp without any CAN or network issues if the remaining speakers are all externally powered? Perhaps the Alpine unit can go where the factory amp was, simplifying the install in the back...

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Old 02-06-2009   #2
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Default Re: Alpine PXE-H650 and the C6 Corvette

Another option would be the Audison BitOne and Rockford Fosgate 3sixty.2 and they covered on this site as well as the PXE-H650....do a SEARCH
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Old 02-06-2009   #3
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Default Re: Alpine PXE-H650 and the C6 Corvette

http://www.diymobileaudio.com/forum/...pressions.html

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Old 02-06-2009   #4
 
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Default Re: Alpine PXE-H650 and the C6 Corvette

Interested to hear opinions on this in C6
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Old 02-07-2009   #5
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Default Re: Alpine PXE-H650 and the C6 Corvette

Seems to be mixed results people have had with the H650. I can only speak to my personal experience with the unit. I've been using it for about 16 months and ~120 calibrations. Here are my thoughts so far.

Pros:
- Incredible processing Power and technology. 512 FIR filter taps per channel with intensity and time correction. In other words, it has almost twenty times the EQ processing per channel of the H701, it has time alignment, PLUS it has room/time correction using Audyssey's MultEq Pro algorithms (which are highly reviewed and very expensive in the home audio market). It also has built in selectable digital crossovers.
- Graphs frequency response measurements using a high quality mic, spatial averaging, and some noise cancelling. In other words, I use the "before" graphs as sort of an multi-position RTA to see whats really going on in my system.
- Automatically calculates EQ, time alignment, time correction, and level matching based on your measurements.
- You can customize with target curves, crossover settings, time alignment, levels, the 3 band parametric eq, and microphone positioning.
- Provides a remote control you can use for volume, sub level, fader, etc. I always just used my head unit volume control with the unit with no ill effects.

Cons:
- Terrible documentation and support. Alpine obviously rushed this to market and even their "master" techs don't seem to have a clue as to how to use it most effectively. Audyssey doesn't really care as they focus on the home market.
- Bass region needs major work after calibration. Tweeter levels also often have to be lowered at the amp.
- Poor customization. Only 4 target curve options, even when using a laptop. You can't set your own target curve. You have to rely on what I mentioned in the pros to customize.
- Has bugs/quirks which have to be worked around. Not a "plug and play" system like they advertise. It could take dozens of calibrations and lots of experimenting to get good results.
- Doesn't determine optimal crossover settings for you. Limited crossover slope selections. Doesn't allow independent left/right crossover frequency or slope. Can't cross tweets and mids at different frequencies to over/underlap.
- Can't save a calibration or import an old one. Really frustrating when you had a great calibration and lost it by trying another. Can't save multiple calibrations, only two presets of time alignment/crossover/level settings.
- Haven't measured the preout voltage, but doesn't seem to be very high.
- Hides problems in your system. You can't imagine some of the problems I've found that this processor fixed. I've gone to audio meets with a blown tweeter and noone noticed (including me) because this compensated for it in the midrange. My system simply sounded worse than it could have with a working tweeter, but since it sounded "OK", it prevented me from knowing about the problem.
- Adjustments to crossovers, levels, time alignment, eq, etc. must be done at the unit itself, makes it a pain to fine tune when installed in the trunk.
- Doesn't allow separate time alignment customization for the tweeter channels
- No surround sound or center channel steering.

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Old 02-07-2009   #6
 
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Default Re: Alpine PXE-H650 and the C6 Corvette



The question was more about integrating it into a C6 Corvette than just the general sonic properties. npdang's report is excellent, but not application specific to me. Some digging elsewhere has confirmed that the factory amp is not on the CAN bus, so removing it completely should be fine. Perhaps I can squeeze the PXE-H650 into that OE amp location.

The "pros" list seems tempting. I'm not worried about using this unit's crossover capability. I can select whatever slope and points I want on the JL amps for individual sub, mid, and horn crossovers. I'd just be using it to generate an equalized stereo output that would go into the 500/1 then the 300/4.

I know they seem to recommend only using the PXE's remote for volume, but the factory speed volume control and steering wheel controls are really nice to keep. I'd also like to use the factory treble/bass controls for very mild adjustments (like when some radio stations broadcast a heavily EQ'd signal with too much bass). The 500/1 also has the ability to add a single adjustable bass boost to fill in the bottom end if needed should the PXE not do it on its own.

I also like the potential for unique EQ and time alignment for windows up vs down. It's only a two seater so I could care less about optimizing lots of listening positions. I only have 5 speakers on 3 channels including the sub, so no worries about losing the 7 channel capability. It's a stereo car, not a home theatre.

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