Krell Intros iBias High-Efficiency Class A Amplifiers
In an iBias amplifier, a circuit continuously measures current flow through the amplifier's output transistors, and instantly adjusts the power (or bias) going to the transistors to suit the demands. The output transistors never shut off, yet very little power is wasted as heat. Not only does the amplifier consume less power, it runs cooler and can be built into a more compact chassis.
"The iBias amplifier is like a high-efficiency 12-cylinder automotive engine in which some of the cylinders shut down when you don't need all that power," McKiegan said. "Just as that engine can run efficiently yet deliver 600 horsepower in an instant, the iBias amplifier can run efficiently yet in a matter or microseconds gives you hundreds of watts of full Class A bias for musical peaks."
iBias amplifiers use features that make them much more practical for custom installation, the company said. The amplifiers are built into relatively small, rack-mountable chassis, making them practical for use in places where a traditional Class A amplifier would likely be too large. Proper cooling is assured through the use of thermostatically controlled fans chosen specifically for their ultra-quiet operation.
Krell has added Ethernet capability to all iBias amplifiers, which allows users to access each amplifier on its own web page through. Using this interface, the dealer or customer can view heat sink temperature, fan speed, and other information, and also receive alerts for such conditions as overheating, fan failure and shorting of the output terminals.
All of the iBias amplifiers have begun shipping or will ship later this month. Here are the prices:
Model - Description - Price (each)
Duo 175 - 175 wpc stereo - $7,500
Duo 300 - 300 wpc stereo - $9,500