Definitely not normal. I own this exact model amp and the loudest thing on it when I am not playing, (with the amp turned up), is the fan. But that noise might be from a power circuit noise from the power in the room, or from a shielding problem with your bass.
Stewart is great in supporting their products. As the second owner of my 2.1, with no receipt from the original purchase, they sent me a new volume/level pot and wiring harness when the original got all noisy and crackly, free of any charge. It was cool too that it was designed to just "snap into" a socket on the main board. No soldering needed.
Don't know why these were discontinued, unless it was because they were pricey when new. They seem to sell for around $450 used, which is a lot of cheap clean power.
Last edited by Boot Soul : 03-03-2013 at 08:16 PM.