I recently had a touch of difficulty with one of my QSC KSub subwoofers, and since it was still barely within warranty I figured I should see if there was anything the company could do about it. I came away very pleased!
QSC is one of the leaders in live sound equipment: they have been making high-quality amplifiers for years, their K and KW series speakers are ultra reliable (and powerful), and their Touchmix board is amazingly innovative. All I have are QSC speakers (K12s, K10s, and Ksubs) and I have given up on buying equipment from anybody else. I am not alone here, most clubs I go to have QSC speakers permanently set up for bands and DJ activities.
Anyway, I called to tell them about my problem, and actually got a customer service agent on the line right away, and she was from their headquarters right here in sunny Southern California. I explained what was going on, and after a little discussion about whether it was a quality defect, they sent out the parts I needed right away (it was a minor thing that I could fix myself).
The parts arrived the next day and this just confirms why I am a loyal QSC customer. They build great stuff and stand behind it. This might not seem like a big deal to some of you, but good customer service is a thing of the past, and it is nice to know there are still companies out there that care about keeping their customers. Throw them some business if you get a chance, you will not go wrong!