Micromega PW-250, PW-400 Operating Manual

OPERATING MANUAL

PW-250 - PW-400

Dear Customer,
Thank you for purchasing one of the two Micromega power amplifiers: PW-250 or PW-400. These amplifiers are mainly different by their output power. This
manual is then common for the 2 models.
This unit provides ease of use and sonics of the highest quality. Please pay close attention to this instruction manual, and read it fully before attempting to
operate. It is designed to ensure you maximise your pleasure of power amplifier and familiarise you with its many unique functions.

CHECKING

Check that the carton has no damage. Should you have any doubt about its condition, please
do not hesitate to contact your dealer.

UNPACKING

Very carefully remove the unit from the box, taking care to preserve all the packing material. It
is good practice to put the carton and its contents into an outer plastic bag and deposit it
somewhere safe and dry. In the unlikely event that your unit needs to be sent back to either
your dealer or distributor, it must be sent in the original packing material. Failure to observe
this will invalidate your warranty.

ACCESSORIES

Upon opening the carton you should find the following:

- Mains Lead.

MAINS VOLTAGE

- Check that the mains voltage indicated on both the carton and the bottom of the unit
correspond to the local power supply

- If you are in any doubt, consult your dealer.

INSTALLATION

In order to obtain the maximum performance of your power amplifier, it is important to follow
the installation instructions.
Wherever possible, we recommend that your amplifier is installed in an audio rack or other
suitable furniture that provides sufficient ventilation.

WARNING!

If for aesthetic or ease of use reasons, you choose to stack the units, it is imperative that you
place your amplifier on the top. Never place any unit on top of your amplifier. We recommend
that you provide a space of at least 30cm above your amplifier in order to ensure adequate
ventilation.

SIGNAL CONNECTION

Having verified that the mains voltage indicated on the bottom of the unit corresponds to the
local power supply mains voltage and that the ON/OFF switch is on OFF position, connect the
mains leads provided to the rear the unit and to the wall socket.
Connect the analog outputs of your preamplifier to the inputs of your power amplifier.
Your power amplifier provides two type of inputs: balanced inputs with XLR type connectors
and unbalanced inputs with CINCH connectors. A switch located on the bottom of the unit near
each leg on rear of the unit allows selecting which type of input will be used. By default the
switch is on XLR position. If you do not want to use XLR inputs, switch to CINCH position.

In any case the bad positioning of the input switch will not damage the amplifier or
avoid using it. However, if the switch does not match the input you are using the
amplifier will not operate properly.

If you wish to use two stereo power amplifiers in passive bi-amping, your amplifiers are per­wired for this mode and you may then use only one modulation cable for each amplifier.
You will then need to ask your dealer for specific jumpers that will be inserted in the location
near the input switches and labeled: PASSIVE BIAMP BRIDGE.
Once the jumpers inserted, you will be able to connect the input cable either on IN-CH1 or IN-

CH2. Both channels of your stereo amplifier will then output the same signal.
We strongly recommend that you get in contact with your dealer or distributor if you
decide to use your power amplifiers in this manner.

SPEAKER’S CONNECTION

Connect your loudspeaker cables between your amplifier and your loudspeakers paying
attention to polarity.
Your power amplifier is fitted with double binding posts for each channel. It will then be easy to
bi-wire your loudspeakers if they provide this possibility. If so, we strongly recommend it.
The very high quality speaker terminals accept different type of connections like bananas, or
stripped up to 10mm² speaker wires. It is important to use quality speaker cable to get the
maximum out of your amplifier.

STANDBY LINK

Your power amplifier is equipped with jack connectors located above the Mains inlet and
labeled: STANDBY LINK IN and OUT.
These connectors allow synchronizing the Standby In and Out of your amplifier with the
Standby In and Out of your PA-20 or AP-180.
To take advantage of this functionality you must request a dedicated Micromega ST-LINK
chord. This chord exists in different lengths or can be made to a specific length on request.
Connect the STANDBY LINK of your PA-20 or AP-180 to the STANDBY LINK IN of your power
amplifier.
If you have more than one power amplifier you can daisy chain the units. After having
connected the first unit as mentioned above, use another ST-LINK chord and connect the
STANDBY LINK OUT of your first amplifier to the STANDBY LINK IN of the second one.

In any case you MUST use Micromega ST-LINK chords to connect the units together.
You could damage your equipment if you fail to do so.

ON - OFF

After all connections have been properly made you may now turn on your amplifier by
switching the ON/OFF switch located at the back of the unit.
The led located in the middle of the front panel will light up in blue. Your power amplifier is in
STBY mode.
Press once on the STBY key located below the led. The led will blink for 2 seconds and then
light up with a different color and intensity. Your amplifier is now ON. If you had connected
your power amplifier to your PA-20 or AP-180, you will have to turn on your system with the
STBY key of your PA-20 or AP-180 or with the AMP or AVP key of your remote control
handset.
When connected with the STANDBY LINK, you cannot turn your power amplifier on if your PA­20 or AP-180 is in STBY mode. However, if your system is ON, you can turn OFF your power
amplifier by pressing on the STBY key of the power amplifier. This could be very useful for
listening to headphones when you do not want to use your power amplifier.

DEFAULT INDICATION

If a major fault would occur on one of the power modules, your amplifier will automatically turn
to protection mode and the front led would light up in red.
If this happens, turn your power amplifier OFF using the ON/OFF switch located at the back of
the unit. Turn your power amplifier ON again. If the led stays in red, you should bring your
amplifier to your dealer for service.