Krell KSA-80

Pure A-class design stereo power amplifier.

Pure A-class circuit is used for the circuit structure.
In addition, the KSA-80 adopts a fully balanced system, which has not been achieved with the KSA-80. Excellent sound quality is obtained by the configuration in which the plus side and minus side of the amplifier circuit are independent.

The output stage adopts 12 parallel push-pull configuration per channel, and excellent low-load driving capability is realized by combining it with a large-capacity power supply.

The KRELL KSA 80 is something of a legend in the world of vintage audio, a Class A power amplifier that has garnered a reputation for its exceptional build quality, uncompromising performance, and robust power delivery. The KSA 80 was introduced in 1984 and was produced until around 1990.

he KRELL KSA 80 boasts a visually striking design that exudes heft and solidity. The amplifier's chassis is crafted from heavy-gauge aluminum, which not only enhances its aesthetics but also provides excellent shielding against electromagnetic interference. The construction is rock-solid, showcasing KRELL's meticulous attention to detail and its commitment to delivering products of the highest caliber. The heatsinks on this beast are something to behold.

The KSA 80 is a fully Class-A dual-mono power amplifier, meaning it contains two independent amplifier circuits, one for each channel. This configuration ensures maximum channel separation and minimal crosstalk, resulting in a cleaner and more precise audio reproduction. The amplifier offers a conservative power output of 80 watts per channel into 8 ohms, and it can double that power into 4 ohms, again into 2 ohms, and again into 1 ohm, allowing it to effortlessly drive a wide range of speakers, including the venerable Apogee Scintilla in its 1-ohm configuration.

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Type Stereo power amplifier
Rated output 80W + 80W (8 ohm)
160W + 160W (4 ohm)
320W + 320W (2 ohm)
Input Sensitivity / Impedance 0.775V/48k ohm
Total harmonic distortion factor 0.03% or Less (20 Hz to 20 kHz, Rated Output)
Frequency characteristic 5 Hz - 100 kHz + 0 -1dB (at Rated Output)
Signal-to-noise ratio 100 dB or more
Damping factor 300 or higher
Pwer 100 VAC, 50Hz/60Hz
Power consumption 400W
External dimensions Width 585x Height 225x Depth 538 mm
Weight 37kg