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M250 Amplifier Instructions for Use Page 5 of 8
Issue 4: May 2002
CONNECTIONS
Taking the left channel connections, the
pre-amp’s left output is connected to the-
first M250’s LINE INPUT (used for the
woofer, or low frequencies), and then the
first M250’s LOOP OUTPUT is connect-
ed to the LINE INPUT of the second
M250 (used for the tweeter, or high fre-
quencies).
Repeat this process for the right channel.
If you are in any doubt about bi-amping,
please contact your dealer, who will be
able to advise.
TRIGGER CONNECTIONS
Two 3.5mm jack sockets on the rear panel
marked TRIGGER IN and TRIGGER
OUT are provided for electronically
switching the “audio sense” mode - see
page 6. These are directly linked together
inside the amplifier, to enable onward con-
nection to a further unit, such as another
M250.
OUTPUT
CONNECTIONS
Connect your loudspeaker to the terminals
marked SPEAKER OUTPUTS.
Two sets are provided for parallel opera-
tion or “bi-wiring”, but note that the
combined load impedance must not be
less than 4 ohms.
BEFORE SWITCHING
ON. . . . .
Plug the accessory IEC mains lead into the
rear panel socket, then the other end into a
wall outlet.
Turn the volume control on your preampli-
fier to minimum, and switch on its power.
All input, output and power connections
should be made with the mains power
switched OFF.
INPUT
CONNECTIONS
As the M250 is a mono power amplifier,
two are required for stereo operation, and
further units can be used for multi-channel
surround systems or bi-amplification etc.
The M250 can be used with a preamplifier
or any audio line level source which has a
volume control.
Connect your pre-amplifier or other line
level source to the RCA socket on the
back panel marked LINE INPUT.
For the best results we recommend either
Musical Fidelity X-LINX "no-nonsense"
cables for this connection or the highly
rated Nu-Vista leads with integral RFI
suppression. Various lengths are available
in the Nu-Vista interconnect range. Please
contact your local dealer for more infor-
mation.
BI-AMPLIFICA
TION
The M250 has a LOOP OUTPUT socket
to allow “bi-amping” of a speaker with
suitable active or passive crossover net-
works. This socket is directly linked
inside the amplifier to the LINE INPUT
socket to enable onward connection to a
further unit, such as another M250.
In this arrangement, typically one M250 is
used to drive the “tweeter” (high frequen-
cies), and one to drive the “woofer” (low
frequencies) of each loudspeaker enclo-
sure. Thus, four M250s would be needed
for a stereo pair.