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The eco-friendly choice
The Knoll KES400 and KES600 are class A/B amplifiers that
produce 50 watts per channel at 8 ohms and 70 watts per
channel at 4 ohms. While offering unparalleled reliability, power
and sound quality the KES400 and KES600 offers a Knoll
exclusive, the Eco-System™ circuit. This patent pending circuit
determines which of the 12 stereo channels (6 pairs) are in use
and delivers power only to those channels needing it. The
channels that are “off” are truly off, not in “standby” or “mute”.
With this circuit the active channels share more rail voltage
resulting in more reserve power for the stereo channels in use.
The most important feature of the Eco-System™ circuit is the
electrical savings that is delivered to the owner over what a
comparable class A/B amplifier will cost to operate. The typical
homeowner will see a savings of a hundred dollars or more per
year in actual electrical costs and that can be multiplied when
taking into account the increased costs of air conditioning the
home to extract unwanted heat produced by a typical multi-
channel amplifier. The KES400 and KES600 also feature a very
quiet energy saving thermostatically controlled fan. A
comparable amplifier without the Eco-System™ circuit (we
should know, we make lots of them) uses about 14 times (65
watts) as much power while idling in standby. By comparison
the KES600 with Eco-System™ uses under 5 watts while idling!
For over 15 years Knoll multi-channel amplifiers have sold
around the world because of their legendary reliability and
unparalleled sound quality. The KES400 and KES600 take the
next logical step by being eco-friendly. Please consider the
environment when choosing your next system.
Problem Action
Power led does 1. Check that the KES400 or KES600 is
not light-no sound plugged in.
2. Test the AC outlet with a lamp.
3. Check KES400 or KES600 power button
is on (in).
4. Slowly turn down the “SENS”
adjustment (counterclockwise) on the
amplifier rear, until the amplifier just
turns on.
Sound cuts out 1. Verify speaker impedance is 4-16 ohms.
Changing speakers may be required.
2. Check if the amp feels hot. If it's
hot, increase cooling – see
Installation.
Sound is distorted 1. Turn the volume down.
2. Check speakers for damage.
3. Check inputs for proper levels.
KES400 or KES600 gain and source
output level may have to be adjusted.
4. Speakers may be less than 4 ohms.
KES400/KES600 1. Turn KES400 or KES600 power switch
not turn off (out).
2. With the power switch on, and all input
channels music source turned on, very
slowly adjust “SENS” on rear of
amplifier in a clockwise direction until
amp turns off.
Speaker pops when 1. Speaker may need resistor placed
amp turned on or off across terminal. Suggest 2k0 1/4 w.
This discharges the speaker internal
capacitor.