Selecting Operating Mode; Optimizing For Speaker Impedance; Input Connections; Output Connections - Soundstream MC-300 Owner's Manual

SELECTING OPERATING MODE

The three hundred watts available from the MC-300 can be
(stereo plus a single mono channels) [Figure 21, or four
channels (front and rear stereo; or stereo bi-amp) [Figure 31.
To select any of these modes, remove the access plugs on
the bottom of the amplifier and set the internal switches
according to the desired mode of operation.
For two-channel operation. set both switches to MONO.
For three-channel operation, set one switch to STEREO and
you must connect wires accordingly.
For four-channel operation, set both switches to Sl~tHEO.

OPTIMIZING FOR SPEAKER IMPEDANCE

As dellvered from the factory. your MC-300 has been opti-
mized for 4 ohm operation. It is possible to optimize this
loudspeakers. This is done by moans of switches inside the
amplifier.
Remove the plugs on the bottom of the amplIfter marked for
Impedance optimization. Behind the plugs locate the two
switches. one for CHANNELS A and one for CHANNELS B.
the impedance of your speakers, or you are wiring more than
one speaker to a set of termlnals. consult your dealer or

INPUT CONNECTIONS

Inputs to the amplifter atlach by means of standard RCA-
type jacks. The MC.300 achieves a level of performance at
which cable and connector quality is significant: the jacks on
your amplifier are gold plated. and we recommend Sound-
stream Interconnecting cable or an equivalent premium
jacks of a tuner!deck. Some tuner/decks use preamp output
connectors other than RCA jacks, in which case you will
need a special adapter available from your dealer.
If your tuner/deck has speaker outputs and no preamp
outputs. you can use the speaker outputs. Wire an RCA
connector to the end of your tuner/deck's output wires.
making sure that you maintain consistent polarity in all
channels.
If you have an equalizerorlow-level crossover network(s) for
bi or tri~amping. these components will be inserted between
your tuner/deck and your amplifier(s). Refer to the manuals
for these components for further details.
In four channel mode, all four input jacks (11 12.22, and 23j
are active for CHANNEL A left and right, and CHANNEL B
left and right, respectively.
In two CHANNEL mode, use only the
CHANNEL A. and only the "right" jack (23) for CHANNEL 6.
of main CHANNEL A or CHANNEL B is operating in mono.
and both jacks for the other main channel,

OUTPUT CONNECTIONS

Use high quality Soundstream speaker cable or an equiva-
lent premium cable for best results.
In four channel mode, all four terminals (4.5.6.7) are active
for main CHANNELA: and all four terminals (15. 16. 17; 18)
are active for main CHANNEL 13
In two channel mode, use only the "+" terminals (15, 18) for
CHANNEL B. The "+ right" terrrlinals (4, 7) have positive
polarity in this mode.
In three channel mode, use only the "+" terminals for which-
ever of main CHANNEL A or CHANNEL B is operating in
mono, and all four terminals for the other tmain channel.
The terrrlinals on your loudspeakers are marked for polarity.
and loudspeaker wire is coded bycoloror by markings on the
jacket. Be sure to connect the left and right channels with the
same polarity. Loudspeaker manufacturers are not consis-
tent in their polarity markings, so if you have loudspeakers of
different types connected to the same amplifier terminal.
the most bass; incorrect polarity produces less bass and a
strangely dislocated sound image on mono material.
If you have more than one amplifier: for each amplifier and
its loudspeakers, the left and right channels must always be
wired witl0he same polarity. But from one amplifier to the
next. correctpolarity may bethesame, or it may be reversed.
This is because of differences in amplifier design. the nature
of crossover filters. and other factors. Again experiment and
verify the correct polarity by ear.
jack (12) for