So I bought a stereo receiver off eBay (Nakamichi RE-10 for $175) to power a new pair of Paradigm Mini Monitors. It was supposed to be in perfect working condition but when I hooked it up the volume level is much lower on the left channel than on the right. How big of a problem is this? Obviously I can compensate by adjusting the balance but is that a good solution? Is this a symptom of a bigger problem? Do I send it back or not worry about it?