User Manual: ZPR4620
6+2 Channel Rack Zoning Mixer
V2.00 (04-2013) © Hill Audio
12
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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
properly, you will create unnecessary noise, as you first dispose of some
already existing signal level, and then later apply amplification (tainted with
noise) to make it up.
Obviously, these two requirements are marking a levelling window that the operator
must match to achieve a good sound with as little distortion and noise as possible.
DANGER
: Excessive volume levels on headphones or other sound
systems may cause hearing damage. Always turn the volume control to
minimum when you switch the unit on, and do not exceed healthy
listening levels.
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Maintenance and warranty
While we have chosen the best components to make this product as rugged and
reliable as possible, some parts in audio products (potentiometers, faders, switches)
are subject to wear which is a matter of operation cycles, and not of time. While
providing a full time-based warranty according to the country’s of purchase
requirements on the function of the electronic circuitry, we hence have to limit the
warranty on such electro-mechanical parts to 90 days from the date of purchase.
In many cases, malfunction of electro-mechanical parts occurs due to dust
contamination, which may require cleaning of such parts. As the inside of such parts is
not accessible, a common practice is to use cleaning fluids in the shape of sprays.
Please be reminded that many of such fluids contain chemicals which may wash away
the dust but at the same time corrode or damage contact surface and may cause
cosmetic damage to other parts. We hence explicitly exclude any claims for exchange
of damaged part due to mechanical or chemical impact.
Without liability, we recommend CaiLube MCL fader cleaner and lubricant available
from CAIG Laboratories if the need of cleaning for electro-mechanical parts occurs.
User Manual: ZPR4620
6+2 Channel Rack Zoning Mixer
V2.00 (04-2013) © Hill Audio
5
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Unpacking
Please check that the box contains the following items:
Main parts:
1 pcs. ZPR4620 main unit
1 pcs. Mains cable
1 pcs. Operation manual
If any part is missing, please contact your dealer immediately for replacement.
Warning:
After unpacking, and 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 (see rear panel of product). Whenever
the specified voltage or your AC plug should not match the local
conditions, do NOT plug the AC cord into the wall outlet and contact
you dealer immediately.
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Back Panel
1. AC inlet and fuse holder. Use the supplied AC cord to connect the unit to AC
mains. Make sure voltage and frequency stated on the unit comply with your
local AC supply. The fuse can be accessed by the small drawer at the AC
inlet. To change the fuse, unplug the AC cord first, pull out the fuse drawer
and replace the fuse ONLY with a fuse of SAME voltage and rating. If the fuse
blows again after replacement, hand over the unit to qualified service
personnel.
2. Stereo Master output. This is a balanced stereo XLR output carrying the main
output signal controlled by (36).
3. Stereo Master output. This is an unbalanced RCA output carrying the same
signal as output (2).