I bought a DSL40 last year from Guitar Center. Picked it up, no box, no papers so expressed my concern to the salesman. He said "Oh it should be ok, if not you've got 45 days to return it".
Ok, so I took it home. I plugged it in and let it warm up on the 20w side. I started at low volume and gradually increased as I played for awhile.
That evening, we were watching TV I turned it on to play for a bit.
I got popping and crackling at low volume on all channels.
I returned it the next day.
I tried out a DSL20CR and liked it but didn't buy it.
After researching the amp I bought the DSL20CR from Sweetwater. I love the amp and have not had one problem out of it. However, I've seen alot of the DSL40 combos for sale used.
Could be something wrong in the circuitry design maybe? Idk.

To The Forum
Well I wonder how the OP made out.
Mitch