I had an F500BT/ND-G500 installed on my Hyundai Veracruz with Infinity external amp. To make it plug-n-play, I provided the installer with a QuickConnect Parrot ISO harness. Since the ND-G500 outputs speaker level, the harness (called a QCHBB) has a little box which converts to pre-amp level. The box also functions as a mute box and the installer tapped into the blue/white amp control wire from the F500 to function as the mute wire. Things worked reasonably well, but intermittently after turning off the iPod AV source or ending a phone call, the system wouldn't unmute for several (3-4) minutes. The QCHBB has an LED to indicate muting and this would remain lit. The mute wire is supposed to drop to ground when un-muting, but this doesn't always seem to happen right away. When it works properly, I can see the voltage drop to 0. I called Pioneer, but they didn't have any suggestions.

 

The installer I used was a bit sloppy and is completely unwilling to address the issue (suggested I just "pull the whole thing out". If you want a place not to go in Houston, I'll tell you.) In trying to clean up the installers mess (things like the ND-G500 installed under the passenger side carpeting right where the passengers feet would go), I discovered they had installed what I think is a ground loop isolator in the audio-in line to the ND-G500. They did this because the heard some background hum when the F500 was turned down and didn't read the directions to the QCHBB which has separate left and right gain controls (which where at the highest level). When I removed the isolator (and turned down the gain), the un-mute time dropped to 15-20 seconds.

 

Any suggestions of how to get rid of this problem (the un-mute delay) entirely?

 

(By the way, the QCHBB otherwise seems like a nice solution for those with external amps who want to use this setup.)

 

Thanks for your help and this outstanding site!