Well thats essentially what happened to me. I recently purchased a Nokia Lumia 800 unlocked from an online store. I openned the box, everything seemed great. I cant remember having a bigger smile on my face in recent memory.
Being the producer I am, i quickly synced my songs via Zune desktop, plugged in my earphones and ran out the door to go to a meeting. Thats when tragedy struck.
Now I'm not the type to exagerate - so when I say there was literally no bass. There was indeed no bass. The lower frequencies... simply dont exist. I was pissed to say the least. I didnt understand. I thought maybe it was a software setting, perhaps it was even the earbuds?
After doing research it turns out I'm not alone. The Lumia 800 indeed has an audio quality problem as demonstrated by gsmarena.com
I packaged the device back up, and sold it on craigslist for $550. Unfortunately, i had no choice but to go ahead and pick up an iPhone 4S instead... not because I wanted to but because Nokia gave me no other choice.
Thats the thing about being a producer. Audio quality > all else. Its a gift, and a curse.