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S5

Stereo Class A Amplifier

S5 Stereo Class A Amplifier

The S5 Stereo amplifier sets the bar for high performance audio power amplifiers. As the sister product of the 150 watt M5 monaural amplifier, the S5 strikes a perfect balance of size and power, able to drive the majority of today’s loudspeakers with a sense of majesty and ease.


Lightning fast transients coupled with a full bodied, yet natural, presentation has come to be a trademark for all BSC Audio products. The S5 has explosive power capabilites, yet the class A circuitry opens a dense musical tapestry drawing the listener deep into the soul of the original musical event.

Output Power: 75 W into 8 Ω, 150 W into 4 Ω, 300 W into 2 Ω, 600 W into 1 Ω
Total Harmonic Distortion: < 0.035% at 20 Hz to 1 kHz, < 0.72% at 10 K, < 0.92% at 20 K, all referenced to 75 W 8 Ω 2.83 V
Signal-to-Noise: > 105.50 dB unweighted, > 112.50 dB A-weighted, all referenced to 75 W 8 Ω 2.83 V
Input Impedance: 48 K balanced via XLR connector, 20 K single-ended via RCA connector
Power Consumption: Stand by Mode: < 2 W, Idle: 700 W, Maximum: 1,400 W
Downloads: Quick Start GuideOwner's Manual
Click for full specifications >>

Power Supply

Sharing the same power supply as the massive M5 monaural power amplifier, the S5 stereo 75 Watt class A power amplifier shares every feature the M5 offers in a single chassis, manufactured to the same exacting standards. The S5 is built around a split 1,450 VA custom toroidal transformer with the power supply divided equally between the left and right channels, offering over 54,000 microfarads of filter capacitance per 75 watt channel. The S5 amplifier can double its 8 ohm rated output power into 4 ohms at 150 watts, 2 ohms at 300 watts and into 1 ohm, where it produces close to 600 watts continuously on both channels. Double regulated secondary power pools feed the critical audio gain circuitry.

Input and Output Stages

The S5 is a dual mono design comprised of two discrete driver boards and isolated output stages, and associated protection circuitry. The output stage for each channel utilizes 2 massive, internally mounted heat sink towers designed to cool the six 230 volt, 17 amp, 200 watt output devices. The towers are optimized to disperse the heat generated by the 75 watts of pure Class A power over a large area, resulting in reduced chassis temperatures. The S5 also incorporates the front panel bias switch to quickly reduce the Class A bias to 50%, or approximately 35 watt high bias class A/B mode, and further to a very low power ECO mode.

Chassis

The S5 boasts the same aluminum chassis, custom machined faceplate, chassis panels, and machined solid brass gold plated output binding posts as the M5.

BSC products have a 5 year warranty for parts and labor.

Dimensions

16.50 in (W) x 10.90 in (H) x 20.75 in (D)

or 419.10 mm (W) x 276.86 mm (H) x 527.05 mm (D)

Full Specifications


Output Power: 75 W into 8 Ω, 150 W into 4 Ω, 300 W into 2 Ω, 600 W into 1 Ω (under ideal power conditions)
Output Impedance: < 0.17 Ω at 10 Hz to 30 kHz
Gain: 25.04 dB
Input Impedance: 48 K balanced via XLR connector, 20 K single-ended via RCA connector
Input Sensitivity: 1.37 V RMS balanced or single-ended
Frequency Response: 10 Hz to 30 kHz +/- 0.25 dB
Total Harmonic Distortion: < 0.035% at 20 Hz to 1 kHz, < 0.72% at 10 K, < 0.92% at 20 K, all referenced to 75 W 8 Ω 2.83 V
Signal-to-Noise: > 105.50 dB unweighted, > 112.50 dB A-weighted, all referenced to 75 W 8 Ω 2.83 V
Power Consumption: Stand by Mode: < 2 W, Idle: 700 W, Maximum: 1,400 W
Inputs: 1 single-ended via RCA connector, 1 balanced via XLR connector
Outputs: 1 pair custom designed gold plated binding posts 0.25 in (6.40 mm) spade terminal width
Dimensions: 16.50 in (W) x 10.90 in (H) x 20.75 in (D)
or 419.10 mm (W) x 276.86 mm (H) x 527.05 mm (D)
Weights: unit only weight: 105.00 lbs (47.63 kg)
shipping weight in carton: 122.00 lbs (55.34 kg)