Power amplifiers stereo — Anthem STR Power Amplifier

The STR Power Amplifier is Anthem's flagship stereo power amplifier, sitting above the P5 with staggering output power. The STR Power Amplifier represents Anthem's most ambitious current statement in power amplifier engineering.

Key specs that matter

Input sensitivity is 2,100mV. Input impedance is 15,000 ohms balanced or 10,000 ohms single-ended. Output power is a substantial 400W into 8 ohms, rising to a staggering 800W into 4 ohms - considerably more than the P5's 500W. Gain is 29dBu. Frequency response spans 20Hz to 20,000Hz within plus-or-minus 3dB. Signal-to-noise ratio is an exceptional 121dB, with total harmonic distortion plus noise at an exceptionally low 0.0007% at 100% global feedback. Maximum power consumption is 1,100W. At 172 x 432 x 470mm and 27.3kg, the STR Power Amplifier maintains a somewhat more compact chassis than the P5 despite its considerably greater output power.

Sound and use context

Expect extraordinary dynamic authority reflecting the staggering 800W-into-4-ohms output combined with the exceptional 121dB signal-to-noise figure, representing Anthem's absolute current flagship power-amplifier engineering ambition.

Pairing

The staggering 800W into 4 ohms output handles the most demanding loudspeaker loads with substantial headroom to spare.

Alternatives

Anthem's own P5 offers a somewhat more accessible alternative within the same broader power amplifier catalogue.