I hear so many upright bassists rave about GK amps. I just started playing upright 3 months ago, but I've played electric for years and years. I do a lot of fly dates, and for some reason backline companies misinterpret where it says in my rider "Ampeg SVT Classic with 8 x 10" cabinet" and bring me a GK amp with a Hartke 4 x 10". And I'm sorry, but I think GK amps sound so cold and sterile. It doesn't help being plugged into a Hartke, but even when they're in a good speaker, they still sound sterile to me. My own amp is an SWR SM-500 through an old Tube Works 4 x 10" (I would still use an SVT if I didn't have to move it myself), and it totally blows away any GK amps I've ever played. Yet tons of DB'ers use them for all kinds of music. Why do they work for you folks who use them? What makes them so good for upright yet so cold-sounding for electric?