Precautions: The amplifier is a wideband design with
substantial power output capability. Certain precautions must be
taken to ensure proper operation:
1. Never expose the unit to moisture.
2. Never plug an input cable into the amplifier while the
amplifier is turned on.
3. Never apply the “thumb test” (touching the “hot” lead of
the input cable with your finger) to the tip of the input
cable or input jack of the amplifier. RF rectification
and/or hum will be created and could cause damage to
the loudspeakers. Knoll will not be responsible for
damage to the loudspeakers due to improper use of the
equipment.
4. Under no circumstances should the output terminals of
the amplifier be short-circuited.
5. Avoid restricting the airflow around the unit. Good airflow
is necessary to help ensure proper operation.
6. Be sure that the loudspeakers connected can handle the
output power of the amplifier at the loudspeakers rated
impedance. The warranty on the amplifier does not cover
damage to loudspeakers that have inadequate power
handling capabilities.
7. Do not stack other system components or any other
materials directly on top of the unit. The heat dissipating
system of the amplifier depends on free-flowing air
around the chassis.
SAFETY INSTRUCTIONS:
WARNING: TO REDUCE THE RISK OF FIRE OR
ELECTRIC SHOCK, DO NOT EXPOSE THIS UNIT
TO RAIN OR MOISTURE.
Read all the safety and operating instructions before connecting
or using this unit. All warnings on the unit and in this operating
manual should be adhered to. All operating and use instructions
should be followed.
WARNING: This product contains chemicals, including lead,
known to the State of California to cause birth defects or other
reproductive harm. Wash hands after handling.
Knoll Systems service information
The MA252 amplifier does not contain any user serviceable parts inside.
If a problem is encountered with the MA252, 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. If you suspect a
problem that may require servicing, contact us at
www.knollsystems.com/contact.html, or by phone at
800-566-5579 or 604-272-4555.
Problem Action
Power LED does 1. Check that the MA252 is plugged in.
not light - 2. Test the AC outlet with a lamp.
no sound 3. If remote on/off is used, check that
the trigger voltage is at 12 VDC.
4. Check MA252 power button on (in).
Sound cuts out 1. Verify speaker impedance is 4-16 ohms.
Changing speakers may be required.
2. Check if the MA252 feels hot. If it's
hot increase cooling - see Installation.
3. If music sense is selected on the rear, the
music level may be too low to activate and
hold the amp on. Turn the source volume up
and the MA252 gain controls down to
compensate. Connect a 12 VDC trigger
(trigger mode) or contact Knoll for information
on defeating the music sense mode.
Distorted sound 1. Turn the volume down.
2. Check speakers for damage.
3. Check inputs for proper levels. MA252 gain
and source output level may need adjusting.
4. Speakers may be less than 4 ohms.
MA252 does 1. In trigger mode, make sure trigger power is
not turn off turning off by removing trigger plug on rear.
Front panel power switch needs to be OUT.
2. In music sense mode, turn off source music
components. If the MA252 doesn’t turn off after
about 2 minutes remove the RCA input plugs. If
the MA252 turns off, reconnect the RCA plugs and
turn down the sensitivity.
…continued on last page.
(4 pages)
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