Driving a single voice coil mono speaker
There may be instances where you will want a single speaker in
an area like a hallway, bathroom, sauna or other area too small
to expect or require stereo imaging. However, you should not be
willing to give up the ability to hear both channels of a stereo
source, the losses would be unacceptable.
With the MX1230 there is no problem. Simply provide a stereo
input to the Audio Buss input on the rear of the MX1230, select
a channel from the 12 available, and set the Buss Switch for that
channel to the “L+R” position.
This setting “sums or combines” the Left and Right channels
of the Audio Buss at the input of the selected channel and
amplifies the combined signal for use by a single loudspeaker.
In our bathroom example, we can now use a standard ceiling
speaker to provide a mono source, with no loss of channel
information, and all without the additional expense of a dual
voice coil speaker, which would require two not one channel
of amplification.
Providing Music to Six Independent Zones
The MX1230 can be used to provide amplification to six zones
independently by providing a whole house input signal at the
Audio Buss input on the rear panel of the amplifier. Each pair
of channels, such as, 1 & 2, 3 & 4 etc. can then be used to
provide that whole house input to six stereo zones by setting
the Buss Switch to the (L) left buss input on the odd numbered
channel, and setting the (R) Right buss input on the even num-
bered channels.Now each zone can be preset to it’s own indi-
vidual maximum level and a wall mount volume control can
attenuate down from the preset level.
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Providing Amplification for a Surround Processor
The MX1230 can be used with a Surround Sound Processor
or the line level outputs of a surround sound receiver, if avail-
able, by simply setting the Buss Switch to the (IN) position and
inserting the RCA cable carrying the individual channel of the
surround processor’s output into the designated RCA input jack
for that channel.
Any unused pair of channels can be used to carry 2 Channel
information from the processor to another zone.
Powering Speakers Outdoors
Whenever you are using loudspeakers outdoors, you should
be aware that sound does not travel like it would in your home.
Without the reflective surfaces of walls and ceilings, sound out-
doors will dissipate quickly. Therefore, in an outdoor situation
the MX1230 provides the opportunity to bridge adjacent chan-
nels, effectively doubling the available power for your speakers.
This can help to overcome the problem of using speakers out-
doors assuming the speakers chosen are capable of handling
the additional power.
Note:
It should be noted that the MX1230 is rated to operate
into a minimum 8-ohm bridged load. Therefore, if you are
using more than a single 8-ohm loudspeaker, you should
consider using an impedance matching speaker selector,
such as the Innovative Home ASM4, ASM6 or ASM8 or possi-
bly using an impedance matching volume control, such as
the Innovative Home VMT1 in a weatherproof housing avail-
able at your favorite DIY store or electrical supply. The choice
of a volume control would allow you the additional flexibility
of being able to attenuate the volume whenever necessary.
Applications
