Bias Level Meter

OPERATION

The KSAamplifiers utilize Sustained Plateau Biasing, a proprietary KRELL design. The Bias display meter on the front panel of the amplifier displays

which level of bias the amplifier is utilizing. Unlike sliding bias designs, Sustained Plateau Bias only changes level when the demand situation relative to input and source material changes. The signal passes through a section called an Anticipator circuit. Once the level of bias is determined by the Anticipator circuit, it automatically biases the output ~f the amplifier before the signal is passed through the output stage. The Anticipator circuit

is several times faster than the output stage itself. This technique insures all signal is passed through the amplifier in pure Class A operation. If the amplifier only requires a low level of Class A bias, the amplifier will bias itself

to use only the amount of Class A power necessary to the demand

parameters. Should the demand parameters exceed the bias level the amplifier is presently working under, the amplifier will increase its bias to the next level to allow all signal to come through in Class A operation. If the demand parameters are less then the bias level indicates for more than 15- 20 seconds, the amplifier will drop to the next lowest bias level.

The bias levels are indicated by appropriate LEDs in the faceplate meter display as they are activated.

Should the demand parameters reach a point at which the temperature of the external heatsink reaches approximately 80 degrees Celsius, the last two levels of bias 3 and 4 will be disabled until the heatsink temperature drops to a safe operating level. The overall output power of the amplifier is not changed when this occurs, only the amount of class A power. You will notice the LEDscorresponding to the top two levels of bias will not illuminate. The LEDs for levels 3 and 4.will come back on when the heatsink temperature is at safe operating levels. This temperature fluctuation will not harm the amplifier. It is provided for consumer safety in a home listening environ- ment.

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KSA-100S, KSA-300S, KSA-200S specifications

Krell Industries is renowned for its high-end audio equipment, particularly in the realm of amplification. The KSA series, which includes the KSA-300S, KSA-100S, and KSA-200S, showcases the brand's commitment to delivering superb sound quality, advanced technology, and exceptional build quality. Each model in this series brings its unique features and characteristics, appealing to audiophiles and music enthusiasts alike.

The KSA-300S stands out as a powerhouse amplifier, capable of delivering an impressive 300 watts per channel into 8 ohms. It utilizes Krell's proprietary Class A-AB design, which combines the efficiency of Class AB with the sonic purity of Class A. This model incorporates advanced thermal management systems, ensuring stability during extended listening sessions. The KSA-300S also features dual-mono construction, allowing for superior channel separation and minimizing crosstalk, resulting in an expansive soundstage with precise imaging.

Next, the KSA-200S offers a blend of power and finesse with its 200-watt output per channel, making it a versatile choice for various speaker types and room sizes. Like its larger counterpart, the KSA-200S employs a Class A-AB design, but its lighter footprint allows for easier placement in audio systems. The build quality is impeccable, featuring a robust chassis that minimizes vibration and enhances sound clarity. Additionally, it includes Krell’s advanced input stage, ensuring minimal signal degradation and optimal performance.

Lastly, the KSA-100S, with its 100-watt per channel output, is ideal for those who appreciate high-performance audio in a more compact package. Despite its smaller size, it retains many of the high-end features found in the larger models. The KSA-100S delivers exceptional dynamic range and musicality, making it perfect for smaller listening environments. It also employs Krell's unique cooling design, which allows the amplifier to maintain optimal performance without overheating.

In conclusion, Krell Industries' KSA series amplifiers represent the pinnacle of audio engineering. With their Class A-AB designs, advanced thermal management, and robust build quality, the KSA-300S, KSA-200S, and KSA-100S offer options for various listening environments and preferences. Whether you're seeking a powerful amplifier for large speakers or a compact solution for intimate audio spaces, the KSA series provides unparalleled performance and sonic excellence.