Sunday, January 5, 2014

BSC S5 Stereo and M5 Mono amplifiers









































Driven by the success of the BSC-60s and BSC-100m Class A amplifiers, The S5 Stereo and M5 monaural amplifiers redefine the standard set by their predecessors and become the new Reference in class A amplification.

S5

The S5, 80 watt class A stereo power amplifier shares every feature the M5 offers in a single chassis, and manufactured to the same exacting standards. This 80 Watt per channel Class A Stereo amplifier is built around a split 1,450 VA custom toroidal transformer and over 54,000 microfarads of filter capacitance per channel. The S5 amplifier can double its 8 ohm rated output power into 4 (160W), 2 (320W) and 1 ohm where it produces close too 640 Watts continuously both channels driven.

The S5 is a dual mono design comprised of two discrete driver boards as well as isolated output stages and protection circuitry.

The output stage for each channel utilizes 2 massive internally mounted heat sink towers designed to cool the six 230V, 17A, 200W output devices. The towers are optimized to disperse the heat of the 80 watts of pure Class A power over a large thermal area resulting in a reduced chassis temperature. The S5 also incorporates the front panel bias switch to quickly reduce the Class A bias to 50% or approximately 38W high bias class A/B mode and further to a very low power ECO mode.

The S5 also boasts aluminum chassis, custom machined anodized front panels and solid brass machined gold plated output binding posts. BSC products have a 5 year warranty for parts and labor.

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

S5 Specifications

Output power:
75 Watts into 8 ohms, 150 watts into 4 ohms, 300 watts into 2 ohms, 600 watts into 1 ohm both channels driven

Output Impedance:
< .17 ohms at 20 Hz to 20 kHz

Gain:
24.3 dB

Input Impedance:
48K Balanced via XLR connector, 20K single ended via RCA connector

Input sensitivity:
1.35V rms Balanced or Single ended

Frequency response:
20 Hz to 20 kHz +/- .25 dB

Power consumption:
Stand by Mode < 2 Watts, Idle: 700 W, Maximum: 1500 W

Inputs:
2 single-ended via RCA connector, 2 balanced via XLR connector

Outputs:
2 pair custom designed gold plated binding posts .25", 6.4 mm spade terminal width

Dimensions:
16.5 in. W x 10.87 in. H x 20.75 in. D
419.1 mm W x 276.1 mm H x 527 mm D


M5

The M5 is not only a more powerful amplifier, but the evolution of a concept.
Based around a 1,450 VA custom toroidal transformer and over 108,000 microfarads of filter capacitance, this amplifier can deliver thunderous power output. The M5 amplifier doubles its 8 ohm rated output power into 4 (280W), 2 (560W) and 1 ohm where it produces over 1120 Watts continuously. The M5 has two redesigned ultra-quiet toroidal transformers coupled to one high current and two fully regulated power supplies. The second transformer is designed for the soft turn-on and other low level circuits to allow the M5 to be activated either by a 12 volt trigger source or the front panel switch. The M5 draws less than 2 watts in standby mode.

The newly designed driver section of the amplifier is based around a discrete, complimentary and DC coupled circuit transferred onto a 4 layer circuit board. The signal paths are gold plated 2oz copper kept short and also curved, optimized to pass critical signals through the least amount of circuitry. All the components meet or exceed military standards and are over specified to promote long life expectancy. All external signal connections between circuit boards and output connections are wired with reference level Transparent Audio cable.

The new output stage is comprised of 4 massive internally mounted heat-sink towers designed to cool the twelve 230V, 17A, 200W output devices. All power signal routing traces are curved and constructed of gold plated 3oz copper. The towers are optimized to disperse the heat of the 140 watts pure Class A power over a wide cross section reducing the overall chassis temperature. The M5 also allows the user to quickly reduce the Class A bias on the amplifier to a half power approximately a 63W high bias class A/B mode and further to a very low power ECO mode via the front panel rotary switch. Bias flexibility allows control over your power demand in different listening situations, but does not limit the amplifiers output power potential.

The M5 has several layers of protection circuitry outside of the signal path designed to protect your amplifier and surrounding equipment where possible. Protection reacts to short circuit, excessive DC offset, over current, and excessive temperature states should they occur.
The M5 external chassis is comprised of ½” thick machined 6061 aluminum. Each panel is affixed to the 1/8” aluminum sub-chassis with stainless steel fasteners. Every part is custom machined for BSC from the multi-part bias knob assembly to the solid brass machined gold plated output binding posts.

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

M5 Specifications

Output power:
140 Watts into 8 ohms, 280 watts into 4 ohms, 560 watts into 2 ohms, 1120 watts into 1 ohm

Output Impedance:
< 0.12 ohms at 20 Hz to 20 kHz

Gain:
27.5 dB

Input Impedance:
48K Balanced via XLR connector, 20K single ended via RCA connector

Input sensitivity:
1.35V rms Balanced or Single ended

Frequency response:
20 Hz to 20 kHz +/- .25 dB

Total Harmonic Distortion:
< 0.065% at 20Hz to 1kHz, < .58% at 10K, < 1.8% at 20K at 135 Watt output 8 ohms

Signal-to-noise:
> 106.5 dB, unweighted, > 116.5 dB, "A"-weighted, 135 W, 8 Ohms

Power consumption:
Stand by Mode < 2 Watts, Idle: 800 W, Maximum: 1500 W

External Chassis top temperature:
< 58° C, 136° F at 100% Bias

Inputs:
1 single-ended via RCA connector, 1 balanced via XLR connector

Outputs:
1 pair custom designed gold plated binding posts .25", 6.4 mm spade terminal width

Dimensions:
16.5 in. W x 10.87 in. H x 20.75 in. D
419.1 mm W x 276.1 mm H x 527 mm D

Weight:
Unit Only - 125 lb, 56.70 kg

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