Power amplifiers stereo — Krell DUO 300 XD

The DUO 300 XD is a stereo power amplifier from Krell, a well-established American manufacturer with a considerable reputation for uncompromising high-current amplifier engineering, built with an exceptionally low output impedance and staggering damping factor. The DUO 300 XD brings Krell's meticulous engineering to two-channel power amplification.

Key specs that matter

Input sensitivity is 2.4mV, with input impedance at 200k ohms balanced or 100k ohms single-ended. Output impedance is an exceptionally low 0.007 ohms on both connections, with maximum current delivery at 16A. Output power is a substantial 300W into 8 ohms, doubling cleanly to 500W into 4 ohms - a textbook power doubling indicating a robust, well-regulated power supply. Gain is 26.2dBu. Frequency response spans an extraordinary 0.5Hz to 100,000Hz within plus-or-minus 3dB. Signal-to-noise ratio is 98dB, with total harmonic distortion plus noise at 0.045% with full global feedback, and a staggering damping factor of 1,140. At 434 x 194 x 536mm and 36.4kg, the DUO 300 XD represents a serious stereo amplifier commitment reflecting Krell's uncompromising build standards.

Sound and use context

Expect exceptional control combined with substantial power delivery reflecting the staggering damping factor of 1,140 and exceptionally low 0.007-ohm output impedance, consistent with Krell's broader uncompromising high-current engineering standards.

Pairing

The clean power doubling into 4 ohms combined with the staggering damping factor suits the most demanding, revealing loudspeaker loads directly.

Alternatives

Krell's broader amplifier catalogue offers alternatives for buyers wanting a different output level.