Behringer HA4700 - Manual (Page 4)

POWERPLAY PRO-XL HA4700/PRO-8 HA8000
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1.1.1 Initial operation
Please make sure the unit is provided with sufficient ventilation,
and never place the POWERPLAY PRO on top of an amplifier or
in the vicinity of a heater to avoid the risk of overheating.
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Before plugging the unit into a power socket, please
make sure you have selected the correct voltage:
The fuse compartment near the power plug socket contains
three triangular markings. Two of these triangles are opposite
one another. The voltage indicated adjacent to these markings is
the voltage to which your unit has been set up, and can be altered
by rotating the fuse compartment by 180°. ATTENTION: This
does not apply to export models that were for example
manufactured only for use with 120 V!
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If you alter the unit’s voltage, you must change the fuses
accordingly. The correct value of the fuses needed can
be found in the chapter “TECHNICAL DATA”.
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Faulty fuses must be replaced with fuses of appropriate
rating without exception! The correct value of the fuses
needed can be found in the chapter “TECHNICAL DATA”.
Power is delivered via the cable enclosed with the unit. All
requiered safety precautions have been adhered to.
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Please make sure that the unit is grounded at all times.
For your own protection, you should never tamper with
the grounding of the cable or the unit itself.
1.1.2 Warranty
Please take a few minutes and send us the completely filled
out warranty card within 14 days of the date of purchase. You
may also register online at www.behringer.com. The serial number
needed for the registration is located at the top of the unit. Failure
to register your product may void future warranty claims.
1.2 The user’s manual
This user’s manual has been written in such a way to enable
you an overview over the control elements of the unit and offers
at the same time detailed information about possible applications.
To facilitate quick look-ups, control elements have been described
in groups depending on their function. Should you need detailed
information about specific topics not covered in this manual,
please visit our website at www.behringer.com. For example,
additional information about power amps and effects processors
is found there.
ATTENTION!
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We would like to bring your attention to the fact that
extremely loud sound levels may damage your hearing
as well as your headphones. Please lower all OUTPUT
LEVEL knobs leftwards before powering up the unit.
2. CONTROL ELEMENTS
This chapter contains descriptions of various control elements
of your POWERPLAY PRO. All controls and connections are
discussed in detail. Additionally, useful advice about their possible
applications is also given.
The HA8000 has eight independent amplifiers for connecting
headphones, while the HA4700 has four. The latter has several
additional features not found in the HA8000 due to space
considerations. The differences between the two units are
explained in detail in the text sections that follow.
2.1 Front panel
Fig. 2.1: Input section
The DIRECT IN socket is used to feed in additional stereo
signals. In the case of the HA4700, the signal brought in via
the DIRECT IN input has the same priority as the MAIN
signal. The HA8000 has a separate DIRECT INPUT
connector for each channel (see fig. 2.3). In the case
of this model, the MAIN signal being fed in is automatically
interrupted when the said input is in use.
The MASTER LEVEL control governs the level of the input
signal that is fed through the MAIN INPUT connectors on
the back or through the DIRECT IN connector.
The HA8000 features two level controls (MAIN IN 1/
MAIN IN 2), so that two separately controllable input signals
can be connected. You select which of the two signals is
monitored by using the IN 1/IN 2 switches in the
respective channel sections.
The 4-digit INPUT LEVEL display informs you about the
input level signal and diplays it in the range between -30
and 0 dB. When the unit is powered on, the ON LED lights
up. You achive the best input signal quality when its level is
at the highest level just before it starts distorting. The clip
LED should light up only during the highest signal peaks.
Fig. 2.2: Individual headphones amplifier sections
The 8-digit OUTPUT LEVEL display informs you about the
ouput signal level of each individual channel, and diplays it
in the range between -30 and 0 dB. When the clip LED
lights up, lower the amount of gain applied to the individual
channels to avoid distortion.
The BASS control (HA4700 only) attenuates or boosts the
low frequency portions of the signal (+/-12 dB).
2. CONTROL ELEMENTS