Yeah, you're refering to this guy I think:

http://www.parts-express.com/pe/showdetl.cfm?partnumber=310-300


I've heard this one before and its plenty loud for most applications. At max volume is near impossible to talk over.. it filled my testing area (17x25) up decently.
http://www.parts-express.com/pe/showdetl.cfm?partnumber=300-380


Just be sure to pair the appropriate impedance speakers to the amplifier.
http://www.datasheetcatalog.org/datasheet/Tripath/mXyzxwwt.pdf

I believe the chip that powers that 2020A as well as the DTA-1 amplifier is the above linked chip and you'll get 15W per channel at 4 ohms, and 10W per channel at 8 Ohms.

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