C5 radio question (axxess module)
Thread Starter
6th Gear
Joined: Apr 2019
Posts: 6
Likes: 0
C5 radio question (axxess module)
I recently swapped out the stock head unit for a kenwood with bluetooth and audio streaming from my android. Seems to be working, but the bass might not be up to par. Is anyone familiar with the Axxess XSVI-2004 module? The "trigger" LED is not on while the system is on which leads me to believe there is an issue with something. Does anyone have that module and do you remember if the LED is supposed to be on while powered up? Bought everything from Crutchfield which is supposed to have great customer service, they had no idea if the "trigger" LED light is supposed to be on. thanks
Thread Starter
6th Gear
Joined: Apr 2019
Posts: 6
Likes: 0
From what I have read, small adjustments on the gain pots should yield a big difference to sound. I have the gain pots cranked to full and there is a difference from min to max but I would think the difference should be larger. System sounds ok but I thought the bass was better with the stock system. It could be in my head though. I have played with the bass settings in the Kenwood unit and it doesn't seem to do anything. thanks
Drifting
Joined: Nov 2016
Posts: 1,660
Likes: 365
From: SF Bay Area
See if you can locate the Bose relay in the passenger footwell fusebox. Try pulling it and see if there is a difference in sound. This will tell you whether or not your Bose door subwoofers are working properly. The other speakers are powered directly by the head unit so this relay would have no effect on them.
Intermediate
Joined: Jan 2019
Posts: 35
Likes: 1
From: Tomball, tx
From what I have read, small adjustments on the gain pots should yield a big difference to sound. I have the gain pots cranked to full and there is a difference from min to max but I would think the difference should be larger. System sounds ok but I thought the bass was better with the stock system. It could be in my head though. I have played with the bass settings in the Kenwood unit and it doesn't seem to do anything. thanks
I just did the same on my car, I think the bass sounded better with the factory radio. But yes you have to adjust the gains on the box to get the subs to come on.
I am now working on figuring what speakers and sub to go with. Going to ditch the factory bose crap and go full aftermarket
Burning Brakes
Joined: Jul 2018
Posts: 1,113
Likes: 144
From: Miami
I recently swapped out the stock head unit for a kenwood with bluetooth and audio streaming from my android. Seems to be working, but the bass might not be up to par. Is anyone familiar with the Axxess XSVI-2004 module? The "trigger" LED is not on while the system is on which leads me to believe there is an issue with something. Does anyone have that module and do you remember if the LED is supposed to be on while powered up? Bought everything from Crutchfield which is supposed to have great customer service, they had no idea if the "trigger" LED light is supposed to be on. thanks
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
I have installed many aftermarket stereos into a C5 Bose Equipt car
None of those MAGIC adapters work period
Beacuse the front door speakers have a built in amp in the speaker boxes and the rear speakers have a separate amp just behind your A/C control unit Nothing in the aftermatket will get you full power
To get a GREAT pounding stereo is not that expensive as you can sell alll the Bose stuff on E bay as it is is well sought after
I use only mid priced stuff
1 a Sony deck with USB adapter' and blue tooth
2 replace the 2 door speakers with comventional 6" speakers ( Sony Explod) remove the stock ones with the bulit in amps
3 Remve the rear amp just behind the A/C unit
4 Intstall conventional speakers in the rear hatch ( again Sony Explod )
5 Intall the best and most powerful amp you can afford
6 Buy a sub wofer box either a single 10" or single 12 or 2 10's or 2 12's
I sold all my Bose stuff for $500 on E bay
I then spend about $800 on the new stuff
Bottom line it only cost me $300 for a pounding bass stero and an clean crisp power 600 watts +
I did intsall it all myself but it you don't have the knowledge you can get it intalled for about $400
Don't try to do a Bose conversion I went down that road I does NOT work !!
None of those MAGIC adapters work period
Beacuse the front door speakers have a built in amp in the speaker boxes and the rear speakers have a separate amp just behind your A/C control unit Nothing in the aftermatket will get you full power
To get a GREAT pounding stereo is not that expensive as you can sell alll the Bose stuff on E bay as it is is well sought after
I use only mid priced stuff
1 a Sony deck with USB adapter' and blue tooth
2 replace the 2 door speakers with comventional 6" speakers ( Sony Explod) remove the stock ones with the bulit in amps
3 Remve the rear amp just behind the A/C unit
4 Intstall conventional speakers in the rear hatch ( again Sony Explod )
5 Intall the best and most powerful amp you can afford
6 Buy a sub wofer box either a single 10" or single 12 or 2 10's or 2 12's
I sold all my Bose stuff for $500 on E bay
I then spend about $800 on the new stuff
Bottom line it only cost me $300 for a pounding bass stero and an clean crisp power 600 watts +
I did intsall it all myself but it you don't have the knowledge you can get it intalled for about $400
Don't try to do a Bose conversion I went down that road I does NOT work !!
Melting Slicks
Joined: Jan 2009
Posts: 3,275
Likes: 739
From: Miami FL
...None of those MAGIC adapters work period. Beacuse the front door speakers have a built in amp in the speaker boxes and the rear speakers have a separate amp just behind your A/C control unit. Nothing in the aftermatket will get you full power...
...Don't try to do a Bose conversion I went down that road. It does NOT work !!
...Don't try to do a Bose conversion I went down that road. It does NOT work !!
The front channels ARE NOT driven by any speaker boxes' built-in amp. The rear channels DO NOT have any separate amp behind the A/C control unit.
The C5 OEM Bose system's 4 main channels are composed of 2 front 3½" and 2 rear 5¼" (or 6½" if a coupe) twiddlers and all 4 of them are directly driven by the headunit's built-in 4-channel amp. In addition to that, each door has an 8" subwoofer directly driven by a dedicated amp that is mounted right besides it.
Using an AXXESS or PAC adapter allows to replace the OEM headunit preserving the arrangement explained above. Again, when properly executed and adjusted, it is an upgrade not a downgrade. There is no reason for not being able to get the "full power", as mentioned in the previous post, that the new headunit could deliver.
Click here for an independent confirmation of the results that could be expected.
This upgrade can be taken a step further by also replacing the 4 OEM twiddlers with 2-way coaxials like
JBL GX Series 2-way car speakers:
- GX302 (3½")
- GX502 (5¼")
- GX602 (6½")
Last edited by GCG; Apr 26, 2019 at 11:50 AM.
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Drifting
Joined: Nov 2016
Posts: 1,660
Likes: 365
From: SF Bay Area
This is not accurate. It is just misinformation. This upgrade can be done with excellent results when properly executed.
The front channels ARE NOT driven by any speaker boxes' built-in amp. The rear channels DO NOT have any separate amp behind the A/C control unit.
The C5 OEM Bose system's 4 main channels are composed of 2 front 3½" and 2 rear 5¼" (or 6½" if a coupe) twiddlers and all 4 of them are directly driven by the headunit's built-in 4-channel amp. In addition to that, each door has an 8" subwoofer directly driven by a dedicated amp that is mounted right besides it.
Using an AXXESS or PAC adapter allows to replace the OEM headunit preserving the arrangement explained above. Again, when properly executed and adjusted, it is an upgrade not a downgrade. There is no reason for not being able to get the "full power", as mentioned in the previous post, that the new headunit could deliver.
Click here for an independent confirmation of the results that could be expected.
This upgrade can be taken a step further by also replacing the 4 OEM twiddlers with 2-way coaxials like
JBL GX Series 2-way car speakers:
The front channels ARE NOT driven by any speaker boxes' built-in amp. The rear channels DO NOT have any separate amp behind the A/C control unit.
The C5 OEM Bose system's 4 main channels are composed of 2 front 3½" and 2 rear 5¼" (or 6½" if a coupe) twiddlers and all 4 of them are directly driven by the headunit's built-in 4-channel amp. In addition to that, each door has an 8" subwoofer directly driven by a dedicated amp that is mounted right besides it.
Using an AXXESS or PAC adapter allows to replace the OEM headunit preserving the arrangement explained above. Again, when properly executed and adjusted, it is an upgrade not a downgrade. There is no reason for not being able to get the "full power", as mentioned in the previous post, that the new headunit could deliver.
Click here for an independent confirmation of the results that could be expected.
This upgrade can be taken a step further by also replacing the 4 OEM twiddlers with 2-way coaxials like
JBL GX Series 2-way car speakers:
- GX302 (3½")
- GX502 (5¼")
- GX602 (6½")
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
The Bose system has bulit in amps in the door speakers LOOK AT THEM !! The rear speakers are driven by an amp just above the A/C controller under the dash on a C5
C'on someone you know this is correct !!!!
C'on someone you know this is correct !!!!
Drifting
Joined: Nov 2016
Posts: 1,660
Likes: 365
From: SF Bay Area
Nope, you are wrong. The unit under the dash is a signal processor that takes the line output from the front output on the radio, processes it, and sends it to the amps in the door. The front output also goes through a filter before reaching the tweeters in the door, but is not amplified in any way. The rear speakers are directly powered by the radio.
Drifting
Joined: Nov 2016
Posts: 1,660
Likes: 365
From: SF Bay Area
That would be correct. The XSVI-2004 has a high-pass filter so that the front doors are getting only the highs. If you bypass the XSVI-2004, theoretically you should be able to get full signal to the front speaker connections.
Melting Slicks
Joined: Jan 2009
Posts: 3,275
Likes: 739
From: Miami FL
It seems you're confused. The doors provide housing for the 3½" front channels AND the 8" powered subwoofers, but they are SEPARATE components with SEPARATE functions, that are SEPARATELY driven. They just happen to be mounted in the same location: the doors.
It seems you didn't read Post 8 above:
The C5 OEM Bose system's 4 main channels are composed of 2 front 3½" and 2 rear 5¼" (or 6½" if a coupe) twiddlers and all 4 of them are directly driven by the headunit's built-in 4-channel amp. In addition to that, each door has an 8" subwoofer directly driven by a dedicated amp that is mounted right besides it.
Last edited by GCG; May 3, 2019 at 11:26 AM.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
A C5 does not have subwoofers
Look you are entitled to your own opinion
I have ownd over 15 C5 and never Corvettes My high end stereo shop could NEVER get full power in any 4 speakers and in the sub
woffer box I installed with 2 10's The Bose system just does not work--
I call it an amplifier you call it by some other made up name ---Bottom line IT DOES NOT WORK with aftermarket hi powered stereo amps There is no such thing as a magic adapter--You want great sound DITCH THE BOSE
maybe your opinion of a hi powered stereo is different than mine or most of the young people today
The Bose adapters are weak and provide absolutely NO pounding base that rattles the windows and the mids and highs are corrupted--to a fine eared stereo expert
Look you are entitled to your own opinion
I have ownd over 15 C5 and never Corvettes My high end stereo shop could NEVER get full power in any 4 speakers and in the sub
woffer box I installed with 2 10's The Bose system just does not work--
I call it an amplifier you call it by some other made up name ---Bottom line IT DOES NOT WORK with aftermarket hi powered stereo amps There is no such thing as a magic adapter--You want great sound DITCH THE BOSE
maybe your opinion of a hi powered stereo is different than mine or most of the young people today
The Bose adapters are weak and provide absolutely NO pounding base that rattles the windows and the mids and highs are corrupted--to a fine eared stereo expert
Melting Slicks
Joined: Jan 2009
Posts: 3,275
Likes: 739
From: Miami FL
As they say, you can lead a horse to water but you can't make him drink... "15 C5s and fine eared stereo expert"!!! 
Again, it seems you didn't read Post 8 or Post 15 above. These are facts:
The C5 OEM Bose system's 4 main channels are composed of 2 front 3½" and 2 rear 5¼" (or 6½" if a coupe) twiddlers and all 4 of them are directly driven by the headunit's built-in 4-channel amp. In addition to that, each door has an 8" subwoofer directly driven by a dedicated amp that is mounted right besides it.
Last edited by GCG; May 13, 2019 at 03:14 PM.
Melting Slicks
Joined: Jul 2015
Posts: 2,297
Likes: 232
From: Round Rock Texas
I did a how to on balance the sound of a Roemvet1. I am not sure the one you have is the same but please read..
https://www.corvetteforum.com/forums...-roemvet1.html
https://www.corvetteforum.com/forums...-roemvet1.html
Le Mans Master
Joined: Nov 2002
Posts: 7,205
Likes: 282
From: NoVA
I need to check mine. I used the xsvi and left everything at mid way but it all sounds good. I am not a high power stereo guy and it's hard to hear much when actually driving at speed but I can turn it up enough to hear it with the top off. Works for me.