Owner’s Manual
Please read the Owner’s Manual completely BEFORE operating the unit.
Troubleshooting
Troubleshooting
seven
Symptom
1. The output light is on (blue) and there is no sound.
A. Check speaker terminations
B. Check the interconnect terminations at the M1 and at
the preamplifier.
C. Check the source equipment.
2. The power light is on, but the voltage light goes on and off
and the output light does not come on. No Sound.
A. Check input source for d.c. at its output. Note: It is not
uncommon for preamplifiers and other audio source
equipment to produce a d.c. offset for a short period of
time after being powered up. This condition will nor-
mally clear up after a few minutes. It is recommended
that the M1s be powered up after the preamplifier,
phono stage, CD player, etc. have been turned on.
3. The amplifier trips off while the output light and voltage
light periodically go out (the sound is interrupted) when
listening at high volume.
A. This condition occurs when the internal protection cir-
cuits detect an over-current condition.
4. The amplifier trips off and the output and voltage lights
turn off. This condition indicates that the output section of
the amplifier has over-heated (78 degrees centigrade). Make
sure that the unit is adequately ventilated. The unit will
Herron Audio M1 Power Amplifier
six
Placement
Although the M1 power amplifier
runs relatively cool, it is recom-
mended that these amplifiers are
used in an open area for best
operation and prolonged life.
Each M1 contains an oversized
toroid transformer wound in a con-
figuration designed for minimum
magnetic field radiation. It is rec-
ommended, however, that the M1s
be placed at least a few feet away
from sensitive front end equipment
such as a turntable or phono stage.
Power Connection
When possible, connect the same
power outlet used for the preamp,
phono stage, CD player, etc. This
configuration will minimize the
reactive currents from power line
RF that will be impinged on the
interconnect cables between the
audio equipment in the system.
Recommended Loading
We do not recommend using the
M1 with a 2 ohm load. As with all
audio amplifiers increasing the
load will increase the distortion
and defeat the purpose of having
a really clean amplifier such as the
M1. For this reason we did not
design the M1 to drive a 2 ohm
load to full power. The over-
current trip circuits will engage
under those operating conditions.
Speaker Cable
Optimum performance from the
M1 will be obtained only with
careful selection of the appropri-
ate cables from the amplifier to
the speakers. Minimum capaci-
tance and inductance is preferred
in order to avoid over-shoot and
ringing in the cables. Here, simple
high quality cable is of utmost
importance.
Installation
Installation
