Connections

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-AMPLIFICATION

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.

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.

Issue 4: May 2002

M250 Amplifier	Instructions for Use Page 5 of 8