XM radio troubles w/ Mach 460

Anyone install a delphi skyfi w/ wired fm modulator in their mach 460. I'm not getting any bass from the unit when its on. Not sure if I wired it correctly or not. I am getting power to the reciever but without the ground hooked up, nothing changes when i do ground it though. Could I have grounded improperly? What 12v power source are you guys using? Anything would be great, Thanks.
 
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