Musical Fidelity A5 CR CONNECTIONS and OPERATION, Input Connections, Bi-Amplification, Operation

CONNECTIONS and OPERATION

All input, output and power connections should be made with the mains power switched OFF.

If in doubt about bi-amplification, please contact your dealer for advice.

INPUT CONNECTIONS

The A5 CR Power amplifier can be used with any preamplifier or line level source which has a volume control. We highly recommend the matching A5 CR Preamplifier available from Musical Fidelity.

Two stereo pairs of RCA audio input sockets marked “A” and “B” on the rear panel allow a choice between either of these input sources.

Simultaneous mixed A and B operation is not possible.

Using good quality co-axial audio leads, connect the left and right outputs from your pre- amp or other line level source to either or both A and B inputs.

Whichever input is chosen, a fixed “line level” audio output from the selected source is available from the adjacent OUTPUT RCA sockets for onward connection to another amplifier. This is to allow for “bi- amplification” (see below).

BI-AMPLIFICATION

The A5’s RCA OUTPUT sockets allow “bi- amplification” of a speaker system using suitable external amplifiers and crossover networks. This enables the speaker drive units to be powered separately, giving noticeable improvement in clarity, imaging and bass weight.

In this arrangement, typically one A5 CR Power amplifier is used to drive the “tweeter” (high frequencies), and another to drive the “woofer” (low frequencies) of each loudspeaker enclosure. Thus, two A5s would be needed for a stereo pair.

LOUDSPEAKER CONNECTIONS

Connect your loudspeakers to either of the two pairs of loudspeaker terminals situated on the back panel marked as LEFT and RIGHT SPEAKER OUTPUT. The wiring must be “in phase”, namely, the + and - terminals must be connected to the left and right speakers the same way round.

Note: - 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 convenient wall outlet.

Turn the volume control on your pre-amplifier to minimum, and switch on its power.

OPERATION

Press the POWER switch button on the left- hand end of the front panel on the A5 CR Power.

The blue POWER LED will light to confirm that the unit is ready for use.

However, for a few seconds no sound will be heard from your speakers, and the red mute indicator LED near the button will be lit, confirming initial mute action.

Select the required audio input source A or B by pressing the selector button on the right- hand end of the front panel. Now increase the volume control on your pre-amplifier to obtain the preferred sound level.

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Issue 1 : November 2004 A5 CR Power Amplifier Instructions for use Page 5 of 7