The SD-AT1000's amplifier uses a single-bit digital-to-analog converter that switches at an ultrahigh 2.8 MHz, more than 60 times faster than the clock used for CD audio, to deliver 40 watts per channel (x 6) of dynamic, ultraclear power across the entire range of audible frequencies (20 to 20,000 Hz), and up to 100 watts per channel at specific frequencies.

A pair of digital-audio inputs accepts Dolby Digital and DTS 5.1-channel surround signals, which the receiver decodes and routes to each of the system's speakers: one petite satellite each for left, center, right, and left/right surrounds, as well as a passive subwoofer with a 6.5-inch cone (the sub is driven by the same 40 watts as each of the other channels).

Dolby Pro Logic II generates 5.1-channel signals from any stereo (two-channel input), and the receiver's other connections include three analog audio (left/right RCA) inputs and a stereo output for feeding, for instance, a CD or minidisc recorder or a tape deck. Should you want to drive your bass to even greater depths (or merely louder levels), the receiver offers a subwoofer pre-amplifier output that can route a variable-level signal to an independently amplified subwoofer of your choosing.

What's in the Box
Integrated surround amplifier, 5 satellite speakers, a passive subwoofer, a remote control, remote batteries, FM/AM antenna, a user's manual, and all requisite cabling.