Uneven sound comiing from my B&W DM630s

Hey, 

I recently noticed that the sound coming from my left speaker is more prevalent than the right.  I'm currently using the B&W's with a Mid 80's 50 watt Denon receiver and a new Technics 1500C Turntable.

So, I switched the cables going to the Denon and the sound is much more even.

Does this sound like a receiver issue?

I'd appreciate any suggestions/help.

Thanks