POWERPLAY PRO-XL HA4700/PRO-8 HA8000
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.
+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!
+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”.
+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.
+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
ATTENTION!
+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
Fig. 2.2: Individual headphones amplifier sections
The
The BASS control (HA4700 only) attenuates or boosts the low frequency portions of the signal
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