User Manual: PSM2420
4+2 Channel Stereo Rack Mixer
V2.00 (05-2014) © Hill Audio
4
3. Before plugging the AC cord in the wall outlet, check whether the
AC mains voltage and frequency is the same as this product is
specified for. Whenever your AC plug should not match the wall
outlet, contact you dealer immediately.
4. If fluids have spilled into the unit or small parts have intruded the
unit, immediately switch off the unit and hand it over to the
authorized service for a security check.
5. Disconnect the unit from AC supply by pulling the AC plug out of
the wall outlet or the unit’s AC socket during a thunder-storm in
order to avoid any damage on the unit due to AC voltage peaks.
6. In cause of not correct function of this unit or damaged AC cord or
other damaged parts, pull immediately the AC plug out of the wall
outlet and hand the unit over to the authorized service for a
security check.
7. To meet all aspects of functionality and security during mainte-
nance work to be performed on this unit, all parts should be
replaced by genuine spare parts. Consequently, take care of your
dealer or maintenance company to be authorized by the
manufacturer.
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Health advice
This unit produces and absorbs electromagnetic radiation. The strength of radiation and
the sensitivity for disturbing interference matches the CE and FCC requirements. A
corresponding sign is printed on the backside of the unit. Any change or modification
may affect the behavior of the unit concerning electromagnetic radiation, with the CE
requirements eventually not to be met any more. The manufacturer takes no
responsibility in this case.
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Functional advice
This unit is immune to the presence of electromagnetic disturbances – both conducted
and radiated - up to a certain level. Under peak conditions, the unit is classified to show
a “class C” performance criteria and may encounter temporary degradation or loss of
function which may need manual help to recover. In such case, disconnect the AC
power from the unit and reconnect it again to recover.
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Environmental advice
This unit is build to conform to the ROHS standards and the WEEE
directive 2002/96/EC of the European Parliament and of the Council of
the European Union. Under these regulations, the product shall not be
discarded into regular garbage at the end of its life, but shall be returned
to authorized recycling stations.
User Manual: PSM2420
4+2 Channel Stereo Rack Mixer
V2.00 (05-2014) © Hill Audio
9
For making audio signal connections, always remember that good and reliable
connections are a basic requirement for good sound and reliable operation. Bad
soldering of cables can result in intermittent audio signals or temporarily lost ground
connections, hence always use good cables. In case of doubt about making proper
connections, please see check the standard pin assignments required for proper
operation in the appendix of this manual.
It is also essential that high-gain inputs are terminated properly to avoid excess noise
contribution. Specifically, this applies to the PHONO inputs. If these inputs are not used
and the sensitivity is switched to “PHONO”, the inputs shall be terminated with the
supplied termination plugs (as factory-inserted at delivery).
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Powering up
Following a proper power-up sequence protects your equipment – specifically speakers
– and your ears. Follow the below procedure:
Turn down all output volume controls of any equipment in your audio system.
Switch on your audio sources first (Turntables, CD Players, PC’s with
soundcards, Tapedecks, etc.)
Switch on the audio mixer
Switch on any audio processor between the mixer and the amplifier(s) [if any].
Switch on the amplifier(s).
Turn up the audio level on your sources if such controls are provided.
Set the audio output of your mixer to a low level.
Set the audio output of any audio processor between the mixer and the
amplifier(s) to a medium level [if any such processors].
Turn up the volume controls of your amplifier(s) slowly.
Make adjustments to all volume settings as needed.
For switching off, follow the inverse sequence – always switch off your amplifier(s) first,
then any processors between mixer and amplifier(s), then the mixer, then the sources.
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Operation
Apart from using good equipment, good sound comes from using it correctly. Level
setting mistakes are one of the common reasons why even good equipment may not
perform as desired. For setting levels, please be reminded that two guidelines need to
be followed:
Avoid distortion by leaving some headroom. Never overrun any audio-
equipment’s inputs. Level meters and displays allow you to make sure that
signals do not enter critical levels.
Avoid unnecessary amplification by using as little attenuation as possible. For
example, if you turn down the input gain of a mixer to minimum, and then
increase the main output of the mixer to maximum to drive your amplifier