CONNECTION
Input: Connect the left and right outputs from the preamplifier to the amplifier inputs
for Channel A and Channel B.
Output: The speaker wires will be connected to the amplifier's output terminals with
one wire connected to the screw terminal marked C and the other to the 4, 8, or 16
ohm screw terminal. Proper connection of the speakers is critical for achieving
optimum performance. There are three criteria for correct connections:
1.
Correct Relative Phase:
The two channels must be wired in phase. This means that
when the same signal is applied to both channels, the right and left channel speaker
diaphragms should move synchronously – in and out together. Terminals on the
speakers are usually coded - one designated “C", "earth", "ground", "-" or black, the
other designated "+" or red. "In phase" connection of the speakers can normally be
achieved by taking care to connect the wire from the amplifier terminal marked C on
each channel to the same coded terminal on each speaker.
In phase connection of the speakers can be readily ascertained by ear. With the
preamplifier mode switch in the MONO position, play a record of a solo vocalist.
With the speakers in phase the voice should be clearly focused between the two
speakers. With the speakers connected out of phase, the voice will be diffused, with
no identifiable source. Relative phase may be reversed by switching the "+" and "-"
leads at one speaker only.
2.
Correct Absolute Phase:
Musical transients are positive going - that is they first
create a pressure front in the surrounding air. It is important that your stereo system
reproduces transients in the same way since the ear can distinguish between positive
and negative transients. This means that on a transient the speaker diaphragms should
first move toward the listener - creating a pressure front.
Each component in your system is either phase correct (non-inverting) or phase
inverting . If you know the phase of each component in your system (your MV45A or
MV75A is phase correct) then correct absolute phase is obtained by the following
simple rule:
THE TOTAL NUMBER OF PHASE INVERSIONS IN THE SIGNAL PATH
SHOULD BE EVEN.
