I originally had this SVT 3 Pro amp paired up with the SVT 6x10 HLF cabinet. Quickly I noticed a buzzing in the mid range tones and some of the low tones. I thought the cabinet had a blown speaker or a bad horn, well I was wrong. I brought both units back so the bass tech could figure out what was wrong. After about an hour and a half of pairing other SVT 3 Pros into different cabinets we figured out that the buzz was only present when it was powering a cabinet 600watt RMS and above, which is the 6x10HLf, and the 8x10E, rated at 800watt RMS. The only cabinet that it seemed to power clearly was the 4x10Hlf which is rated at 500watt RMS. Now don't be discouraged, the SVT 3 Pro is a very loud and powerful 450 watt amp. It has clean tone ranging to fit any musical style and hands down the best sounding amp in its class. I still rate this amp 4 stars, it just underpowers anything larger that a 4x10 cab, otherwise, 5 stars.
Las Vegas NV