Alfa Romeo Forum banner

1 - 7 of 7 Posts

·
Registered
Joined
·
11 Posts
Discussion Starter #1 (Edited)
Hi Everybody, just replaced my GT's original HU with a Pioneer 9300SD. Shiny car's excellent thread really helped.
I've used steering interface harness (CTSAR003), Bose harness adapter to RCA (PC2-36-AMPR) & patchlead (CTPIONEERLEAD).
Everything works fine except the volume control requires to be quite high for normal listening level (at least 2/3 scale).
I'm wondering is this something that I just have to live with or is there a fix? Any advice appreciated.

Note - for anyone else fitting this Pioneer to the GT, you will need 4 x right angle RCA adapters for PC2-36-AMPR. The clearance of the heater unit is insufficient behind the HU to push it fully home without them.
 

·
AO Silver Member, 155 Lounge Winner 09
Joined
·
7,713 Posts
It is unfortunately something to become used to. Even with the 'high volt' 4V preouts (ie: at full volume, the audio signal will reach 4V peak-peak), this is only just enough to run the BOSE amp to high volumes. In the past, Pioneer used to offer 6V headunits, but you can no longer buy these.

If you really struggle to accept it, there are 2 options:
1. rather than use the RCA outputs, use the speaker outputs; the audio signal will be much higher because it's amplied by the headunit (but will be at the other extreme; it will end up loud at only small volume settings); but the signal quality is not as good in terms of clarity
2. use a 'line driver'; this needs to be connected to +12V, but is essentially a signal booster, and can be adjusted; it'll take a bit of work to fit one (in terms of the wiring and extra RCA cables), and cost a bit of money, but is ultimately the best option if you are serious about it

:)
 

·
Registered
Joined
·
11 Posts
Discussion Starter #3
Thanks for that - I definately want to retain the higher quality RCA output. I'll play around with the HU's audio settings and just drive the car for a while to see how I get on. If I do decide to try a line driver, I'll post back how it goes. Tks again for the help and advice.
 

·
Registered
Joined
·
11 Posts
Discussion Starter #4
mmmmm..... - been driving the car a couple of days and the volume control is pretty much maxed out most of the time. Think I need to consider the line driver as you suggested. Any ideas for a suitable type and site location in the GT?
I was also wondering what you think of replacing the Bose amp instead of fitting a line driver - is that a viable option? Tks again for advice.
 

·
AO Silver Member, 155 Lounge Winner 09
Joined
·
7,713 Posts
An example of a high quality LD is the Audiocontrol Matrix.
http://www.audiocontrol.com/t34/5249/14164/Special-Processors/The-Matrix-Six-Channel-Car-Audio-Line-Driver.html

You can find cheaper ones, especially as you only need a 4-channel model. I would check with your local ICE specialist about what they can order in.

They don't drawer much power, so you could run it off the same powerwiring as the headunit, and can probably fit it on the carpet under the passenger seat. You'd then run some shortish RCA cables from the front/rear preouts on the headunit to the inputs of the LD, then another set of RCA extension cables from the LD back to your PC2-36-AMPR.

Changing the amp is definitely possible. It would be easy for audio connection, via RCA cables from the headunit all the way to the amplifier. You would need to run a new (fused) powerwire directly from the battery (through the firewall, under the door sill trims/carpet, to the boot), and groundwire from amp to chassis (can use factory groundwire bolt). Reconnecting the factory speakerwires from the BOSE amp to the new amp will be fiddly, but do-able. With a wiring diagram, you can locate the wires in the BOSE plug that feed the front speakers and sub (probably don't need to run rear speakers, cos they are primarily for rear passengers); cut them, soldler on extensions, and connect to the new amplifier output terminals.

Either option isn't really as hard as it seems.

:)
 

·
Registered
Joined
·
11 Posts
Discussion Starter #6 (Edited)
Thought I'd pop in an update on where I ended up with this for anyone struggling with the GT setup like mine. Basically, I have removed the Nexxia Audio RCA preouts harness PC2-36-AMPR and replaced it with the Connects2 CT51-AR01. This uses the Pioneer ISO plug to interface with the Alfa speaker harness. So, not benefitting from the higher quality audio output from the HU's RCA preouts but solving the volume control issue without a line driver - the volume control functions perfectly now. I have to say also, I cannot detect any difference in quality. Perhaps the RCA preouts don't make that much difference when going into the factory fit Bose amplifier and standard speaker wire.

Note - the Connects2 product listing for CT51-AR01 does not include the GT (only the 147/156/159 2007>), however I was pretty sure it would also suit the GT and it does.
 

·
AO Silver Member, 155 Lounge Winner 09
Joined
·
7,713 Posts
Good result. Thanks for the update. *bookmarks post for future reference*
 
1 - 7 of 7 Posts
Top