If the number of phase inverting components is either none, or even, then simply wire
the speakers in a phase correct manner (amplifier C to speaker "-", amplifier 4, 8, or
16 to speaker "+'.
If the number of phase inverting components is odd, then one more inversion should
be added. This may either be accomplished at the speaker by wiring amplifier C to
speaker "+" and 4, 8, or 16 to speaker "-" or by reversing the positive and ground
leads of the cartridge. The latter method is preferable if one inversion occurs in either
your pre-preamplifier (the HV-1 is inverting) or in your preamplifier phono stage
(but not both). Making the correction at the cartridge will then permit phase correct
tape recording and playback.
If you do not know the phase of each component in your system, try listening with
your speakers hooked up both ways. When correctly phased, plucked strings and
other sharp transients will sound noticeably better defined.
3.
Impedance Matching
- Matching the rated nominal impedance of your speakers
with the amplifier output' taps will not necessarily guarantee optimum performance.
The sound with a given set of speakers will vary with the different impedance taps.
We suggest listening to each of the three taps to select the best match for your
speakers.
Monaural Operation - (MV75A only)
Set the switch on the amplifier to the "mono" position. Connect the output of your
preamplifier to either input (only one input should be used; the other must be left
open.) Connect the speaker to either output as follows: a 4 ohm speaker should be
connected to the 8 ohm terminal, an 8 ohm speaker should be connected to the 16
ohm terminal, or a 16 ohm speaker should be connected to the 16 ohm terminal (in
this case power will be considerably more than 75 watts but will not achieve 150
watts). A single jumper of heavy gauge wire should be connected from the selected
impedance terminal (4, 8, or 16 ohm) to the same impedance terminal on the other
channel's output.
Warning: When the outputs are connected for monaural operation as just described,
the stereo-mono switch must be in the mono position to avoid possible damage to the
amplifier.
