powersoft M28Q User Manual

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10
M Series User Guide
4.2 Mounting
All Powersoft ampliers are designed for standard 19” rack
mounting; there are four front panel holes and two rear-lateral
holes. In order to limit the risk of mechanical damages, ampliers
must be xed to the rack using both frontal as well as rear
mounting holes (see FIGURE 9)
FIGURE 9: Amplier rack mounting holes, front and back
4.3 Cooling
All Powersoft ampliers implement a forced-air cooling system to
maintain low and constant operating temperatures. Drawn by an
internal fan, air enters through the slots in the front panel and is
forced over all components, exiting at the back of the amplier.
The amplier’s cooling system features an “intelligent” variable-
speed DC fan which is controlled by heat sink temperature sensing
circuits: the fan speed will increase only when the temperature
recorded by the sensors rises over carefully predetermined values.
This ensures that fan noise and internal dust accumulation are kept
to a strict minimum. Should however the amplier be subject to
an extreme thermal load, the fan will force a very large volume
of air through the heat sink. In the extremely rare event that the
amplier should dangerously overheat, sensing circuits shut down
all channels until the amplier cools down to a safe operating
temperature. Normal operation is resumed automatically without
the need for user intervention.
Caution regarding heat escape should be exercised when
mounting M Series ampliers. Exhaust cooling air is forced out
through the rear of the chassis (see FIGURE 9); make sure there
is enough space around the back of the amplier for this air to
escape. M Series ampliers can be stacked one on top of the other
due to the efcient cooling system they are equipped with. There
is however a safety limit to be observed: in case a rack with closed
back panels is used, leave one rack unit empty every four installed
ampliers to guarantee adequate air ow.
4.4 Operating Precautions
Make sure the power switch is off before attempting to make any
input or output connections.
Make sure the AC mains voltage used is within the acceptable
operating voltage range specied in the M Series documentation
(factory selected 115 V / 230 V ±15%), depending on your country
mains. Damage caused by connecting the amplier to an improper
AC mains voltage is not covered by the warranty.
By using good quality input and speaker cables, the likelihood of
erratic signal behavior is reduced to a minimum. Whether you
make them or buy them, look for good quality wires, connectors
mounting holes
air flow
mounting holes
mounting holes
and soldering techniques.
4.5 Grounding
There is no ground switch or terminal on the M Series ampliers.
All shield terminals of input connections are directly connected to
the chassis. This means that the unit’s signal grounding system is
automatic. In order to limit hum and/or interference entering the
signal path, use balanced input connections.
In the interests of safety, the unit MUST always operate with
electrical safety earth connected to the chassis via the dedicated
wire in the 3-wire cable. Never disconnect the ground pin on the
AC mains power cord.
4.6 AC Mains Connection
The AC Mains connection is made via the IEC type connector on
the back of the amplier. Please make sure your AC mains power
source operates within the voltage limits indicated on this manual
(factory selected 115 V / 230 V ±15%).
FIGURE 10: Mains connector
Safety warning! Ground wires must be connected! Do not use
adapters that disable grounding.
5 Connections and Operation
5.1 Introduction
This section provides information on amplier connection and
operation. For optimal amplier performance, it is important to
understand the meaning of the information that each M Series
amplier can provide regarding its status and conguration. This
information is available to the user via front panel indicators as
well as through specic LEDs the back of the unit (for DSP version
only). This chapter will break down all the front panel and back
panel functions. The remaining part of the chapter will explain
how to correctly connect the amplier’s inputs and outputs.
5.2 Front Panel Air Filters Access
The blue front panel of all M Series ampliers can be removed
to access the air lters. This is useful when the air lters need to
be cleaned due to dust accumulating and clogging the lters thus
hindering proper air circulation vital for cooling purposes.
To remove the blue colored front panel:
MAINS
GROUND
open the lock and
insert the plug
lock the plug

powersoft M28Q Specifications

General

Brand	powersoft
Model	M28Q
Category	Amplifier
Language	English