Anthem STR Power Amplifier

The Flagship 2-Channel Power Amplifier Meets Modern Canadian Engineering

Inspiration drawn from uncompromising audiophile performance meets modern two-channel hi-fi innovation. The Anthem STR Power Amplifier is Anthem’s flagship stereo power amplifier, engineered to deliver massive current reserves and absolute command over even the most demanding reference loudspeakers.

Housed in a sleek, modern chassis featuring a striking 7-inch graphic control display, the STR Power Amplifier visually and sonically complements Anthem’s STR Preamplifier while pairing refined Canadian craftsmanship with Anthem's most advanced Class AB amplifier topology.

Engineering Marvel: Unprecedented Signal Purity, Massive Current Reserves

Don't let its refined exterior deceive you. Under the hood, the STR Power Amplifier features a true dual-mono architecture powered by two colossal, low-noise toroidal transformers—one dedicated to each channel. Employing 16 high-current bipolar output devices per channel and a cascoded complementary feedback input stage, it delivers effortless dynamic authority, zero dynamic compression, and total stability into ultra-low impedance loads.

Key Performance & Technological Innovations

True Dual-Mono Power Delivery: Delivers 400 Watts continuous per channel into 8 Ohms, 600 Watts into 4 Ohms, and up to 800 Watts into demanding 2 Ohm loads with both channels driven.

16 Bipolar Output Devices Per Channel: Spreads the thermal and electrical load across 16 bipolar output devices per channel to drastically reduce distortion, maintain extreme linearity, and ensure instantaneous peak response.

Cascoded Complementary Feedback Input Stage: Features 8 hand-selected low-noise bipolar input devices per channel configured in an active-load cascoded feedback arrangement for reduced distortion and superior bandwidth.

7-Inch Graphic TFT Front Display: Includes a high-resolution front-panel screen displaying real-time power VU meters, system status, internal channel temperatures, and setup navigation.

Advanced Load Monitoring (ALM™) & Direct-Connected Supply: Operates without rail fuses in the signal path for low output impedance and instant power availability, backed by non-invasive ALM™ protection against over-current or thermal events.

Soft Turn-On & Flexible Activation: Employs sequence-controlled soft turn-on to prevent breaker trips, paired with 4 flexible power options (Manual, 12V Trigger, Audio Signal Sensing, or Trigger + Signal Sensing).

Audition the Anthem Experience at Brisbane HiFi

Sound this visceral, detailed, and dynamic needs to be heard and felt in person. From the lightning-fast transient speed of dynamic peaks to the dead-silent noise floor required for high-resolution acoustic recordings, the STR Power Amplifier sets a benchmark for flagship two-channel amplification.

At Brisbane HiFi, our dedicated audition spaces offer the ideal setting to experience the Anthem STR Power Amplifier. Whether you are building a reference 2-channel stereo system or pairing it with the Anthem STR Preamplifier or AVM processors, our expert audio team is here to guide your audition.

Experience Living Art: Visit the Brisbane HiFi showroom to hear the Anthem STR Power Amplifier in person, or speak with our team about custom home theatre and 2-channel audio integration.

Product Specifications

Power Output (Continuous RMS, 20 Hz – 20 kHz, <1% THD): 400 W @ 8 Ω | 600 W @ 4 Ω | 800 W @ 2 Ω (Both channels driven)

Signal-to-Noise Ratio (SNR): 121 dB (IEC-A, ref. 400 W)

Total Harmonic Distortion (THD): 0.0007% @ 100 W (1 kHz) | 0.005% @ 100 W (20 kHz)

Frequency Response: 20 Hz to 20 kHz ($\pm 0.1\text{ dB}$) | Power Bandwidth: 91 kHz (-3 dB at 400 W into 8 Ω)

Slew Rate: $30\text{ V/}\mu\text{s}$

Damping Factor: 360 (20 Hz to 1 kHz, ref. 8 Ω)

Channel Separation: 101 dB @ 100 Hz | 98 dB @ 10 kHz

Inputs: 1 x Balanced XLR Stereo Pair, 1 x Single-Ended RCA Stereo Pair, 1 x 3.5mm Trigger In

Outputs: 1 x Oversized Audiophile Binding Post Pair, 1 x 3.5mm Trigger Pass-Through

Power Consumption: 310 mW (Standby), 65 W (Idle), 150–300 W (Typical), 600–1100 W (High Playback)

Dimensions (W x H x D): 432mm x 172mm x 470mm

Weight: 27.3 kg

What’s in the Box?

1 x Anthem STR Power Amplifier (Available in Black or Silver)

1 x 3.5mm Trigger Cable

1 x Heavy-Duty Mains Power Cable (Australian Plug)

Quick Start & User Documentation