User's Manual

8. Make sure the speakers in each room are connected in phase
with the amplifier + going to the speaker +. Out of phase
speakers give unstable imaging and poor bass response.
9. Connect the AC power into an outlet than can supply at least
six amps (750 watts) dedicated to each KES400 or KES600.
10. After the amp has been turned on adjust the “SENS” pot on
the rear of the amplifier if necessary. The “SENS” adjustment
can be adjusted up (clockwise) to make the amp less
susceptible to be turned on due to nuisance noise and hum. If it
is adjusted too high, the amp may delay turn on or turn off
during a quiet music or speech passage.
Caution: Never listen to sound that is distorted. If distorted
sound is heard, turn the volume down immediately or speaker
and/or amplifier damage could occur that is not covered by the
warranty. If this problem persists, contact your dealer.
User Adjustments and Service: There are no user
adjustments inside the KES400 or KES600. Your installer may
make certain gain and sensitivity level adjustments on the rear
panel.
Caution: The KES400 or KES600 contains no user serviceable
parts, so do not attempt to open or repair the KES amp.
Refer servicing to a qualified technician only or contact the
factory for information.
Troubleshooting
If a problem is encountered with the KES400 or KES600
amplifier, the most expedient procedure is to locate the problem
and if possible repair it before requesting service. Be sure to
carefully check other system components such as controllers,
CD players, volume controls, wiring, speakers, etc. that may be
at fault.
Installation
Installing the amplifier should be relatively easy. With a bit of
planning, this amplifier will give trouble free service for years.
1. The most important consideration when installing the
KES400 and/or KES600 is cooling. This amplifier has a lot of
power packed into a small chassis size. When installing it in an
equipment stack, it should be the top component. It needs at
least 3"-5" of space above the amplifier to allow for adequate
convection cooling.
2. When installing the KES400 and/or KES600 in a rack we
suggest adding a 3-1/2" blank above and below the amplifier. In
multiple KES400 and KES600 installations, plan for a 3-1/2"
blank (double) between each amplifier and a 3-1/2" blank on
the top and bottom. Amplifiers should always be the top
components in a rack system.
3. The KES400 and KES600 are available as an optional 19" EIA
rack mount style.
4. Never operate a KES400 or KES600 on its side, as the cooling
potential drops significantly when operated on the side.
5. Connect the KES400 or KES600 RCA inputs to the source
component outputs with good quality, short as possible RCA
jack cables. Connect each channel individually.
6. Connect the KES400 or KES600 speaker outputs to speakers
using good quality speaker wire. Minimum 16 gauge copper wire
is recommended with 14 gauge minimum for runs over 30'
(10m). Fire-rated wire may be required if installing wires inside
walls, ceilings or floors.
Note: Ideally the KES400 and KES600 amplifiers like 6-8 ohm
loads. Connecting to 4-ohm loads won't hurt the amplifier, but
the channels connected to 4-ohm loads may occasionally
shutdown due to overloading. Never connect any KES400 or
KES600 amplifier to less than 4 ohms.
7. Individually adjust the channel gains as required. Ideally, all
gains are fully on (fully clockwise).