Crescendo Systems Solo Brochure

Solo

Power Amplifier for High-Quality Sound Reproduction

Music as it has been recorded!

With its high current drive capability, its low noise and low distortion, the ‘Solo’ brings any
recorded detail onto your loudspeaker. You might characterize the ‘Solo’ by its strong and

crystal clear sound, yet … the ‘Solo’ does not have a sound of its own! It just amplifies and
adds nothing but power to your music. Loud and clear!

This is the result of a well-balanced straightforward design and the lack of electronic
protection circuits. A slow-blow mains fuse and an auto-recovery thermal mains switch
protect your amplifier. That’s enough!

The ‘Solo’ can deliver 60W RMS into an 8Ω load and 100W RMS into a 4Ω load. The low
output impedance and high current drive capability make it a perfect choice for
loudspeaker systems with complex multisection crossover filters. Usually the impedance of
such speaker systems strongly depends on frequency and interferes with traditional
protection circuits. The ‘Solo’ doesn’t employ these circuits. It drives any loudspeaker with
an exact and powerful copy of its input signal. That’s all!

The ‘Solo’ uses a PENTAFET output stage that does the main amplification. An analog
computational bias circuit accurately biases this output stage and reduces any distortion
below audible levels.

With the ‘Solo’ … you can hear the music as it has been recorded!

Isn’t that what you always wanted?

Features

• Elegant design

• Stable and powerful drive for electrodynamic, magnetostatic and electrostatic

loudspeakers even with complex cross-over filters

• PENTAFET 1 output stage delivers 120W peak power into 8Ω

• High current drive capability over a wide output voltage range

• Low distortion < - 96dB over the whole audio frequency range and for output powers
up to 60W in 8Ω

• Low noise < -126dB (DIN A weighted)

• Wide bandwidth (DC-200kHz)

• Dynamic Class AB biasing using ABC&C

• Silent on/off architecture

• Thermal overload protections

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PENTAFET: matched Triple P-MOSFET and Dual N-MOSFET push-pull output stage

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ABC&C: Analog Bias Computation & Control for stable and distortion free dynamic class AB operation

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Silent on/off circuit architecture guarantees silent on/off switching without the use of relay switches

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Mains fuse protects the output stage in case of a shorted output (no electronic current limiting circuits)

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