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14
S5 Stereo Power Amplifier /M8 Monoblock Power Amplifier
Master Power Switch
-
The large rocker switch on the rear panel is a master power switch. When it is
in the OFF position, power to the unit is completely off. When it is in the ON
position, the front panel Power
2
button and remote control Power
A
button
can be used to activate the unit or put it into standby mode.
12V TRIGGER Connection
9
See Figures 5-1/5-2
The jack labeled IN is for connecting the 3.5 mm Plug/Cable carrying a +12
volt trigger signal to turn the amplifier on and off. This input accepts any
control signal (AC or DC) ranging from 3 volts to 30 volts.
The jack labeled OUT is for connecting another 3.5 mm plug/cable to provide
a 12V trigger signal to other components. The 12V output signal is available
whenever a +12 volt trigger signal is applied to the IN connector.
Protection Circuitry
2
The amplifier features thermal and over-current protection circuits that
protect against potential damage in the event of extreme or faulty operating
conditions. Unlike many designs, these protection circuits are independent
of the audio signal and have no impact on sonic performance. Instead, the
protection circuits monitors the temperature of the output devices and the
current they are handling and shuts down the amplifier if operating conditions
exceed safe limits.
Most likely, you will never see this protection circuitry in action. However,
should a faulty condition arise, the amplifier will stop playing and the Power
LED on the front panel will be red.
If this happens, turn the amplifier off, let it cool down for several minutes, and
attempt to identify and correct the problem. When you turn the amplifier back
on, the protection circuit will automatically reset and the Power LED should
be white, indicating that the amplifier is operating normally.
In most cases, the protection circuitry activates because of a fault condition such
as shorted speaker wires, or inadequate ventilation leading to an overheating
condition. In very rare cases, highly reactive or extremely low impedance
speaker loads could cause the protection circuit to engage.
If the protection circuitry triggers repeatedly and you are unable to isolate
and correct the faulty condition, contact your authorized Michi dealer for
assistance in troubleshooting.
Input Signal Connections
See Figure 3-1/3-2
NOTE: To prevent loud noises that neither you nor your speakers will
appreciate, make sure the system is turned off when you make any signal
connections.
The S5 and M8 have conventional RCA type input connectors, the type found
on nearly all audio equipment, as well as Balanced (XLR) input connectors.
Select high quality audio interconnect cables. Connect each of the outputs from
the preamplifier or signal processor to the corresponding input of the amplifier.
Input Selector Switch
8
A toggle switch in the rear panel selects the type of input signal to use. Select
the correct inputs to use with this switch.
NOTE: You should choose only one method of analog connection from
a source component to the amplifier. Do not connect both the RCA and
XLR outputs of a source component to the amplifier at the same time.
Speaker Outputs
See Figures 3-1/3-2
Speaker Selection
We recommend using loudspeakers with a nominal impedance of 4 ohms or
higher with the amplifier. The dual output binding posts are ideal for bi-wire
installations allowing 2 pairs of wires to drive the HF and LF speakers each
with individual wires from the left or right channel of the amplifier. Speaker
impedance ratings are less than precise so use care when selecting the
loudspeakers to attach to the amplifier. In practice, very few loudspeakers
will present any problems for the amplifier. See your authorized Michi dealer
if you have any questions.
Speaker Wire Selection
Use insulated two-conductor stranded wire to connect the amplifier to the
speakers. The size and quality of the wire can have an audible effect on the
performance of the system. Standard speaker wire will work, but can result in
lower output or diminished bass response, particularly over longer distances.
In general, heavier wire will improve the sound. For best performance, you may
want to consider special high-quality speaker cables. Your authorized Michi
dealer can help in the selection of cables for your system.
Polarity and Phasing
The polarity – the positive/negative orientation of the connections – for every
speaker and amplifier connection must be consistent so all the speakers will
be in phase. If the polarity of one connection is reversed, bass output will be
very weak and stereo imaging degraded. All wire is marked so you can identify
the two conductors. There may be ribs or a stripe on the insulation of one
conductor. The wire may have clear insulation with different color conductors
(copper and silver). There may be polarity indications printed on the insulation.
Identify the positive and negative conductors and be consistent with every
speaker and amplifier connection.
Speaker Connections
0=
NOTE: The following text describes both binding post and plug-in
connections. DO NOT use both connection methods in combination to
connect multiple speakers.
Turn off all the components in the system before connecting the speakers. The
amplifier has color-coded binding post connectors on the back panel. These
connectors accept bare wire, connector lugs, or dual banana type connectors.
(Except in European Community countries where their use is not permitted.)
Route the wire from the amplifier to the speakers. Give yourself enough slack
so you can move the components to allow access to the speaker connectors.
If you are using dual banana plugs, connect them to the wires and then plug
into the backs of the binding posts. The thumbscrews of the binding posts
should be screwed in all the way (clockwise).
If you are using terminal lugs, connect them to the wires. If you are attaching
bare wires directly to the binding posts, separate the wire conductors and
strip the insulation from the end of each conductor. Be careful not to cut into
the wire strands. Unscrew (turn counterclockwise) the binding post. Place
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