Mach Radio

[foxy1149]

Hi people ,I'm new and I have a question for someone hoping you may be able to help .I have a Pioneer Mach Radio in my Ford Explorer with a Mach sub woofer and a OE CD changer in the back .I have noticed my Volume has decreased somewhat only when I use the Changer .The HU has it's own CD player and cassette and the volume is excellent .but as soon as I use the Changer the volume is out of balance and very quiet . The HU is working fine Can someone suggest any thing or is my Changer dying ????? Cheers Foxy1149