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FCC Warning Statement  
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s 
authority to operate the equipment. This equipment has been tested and found to comply with the limits for  a 
Class B digital device, pursuant to Part  15 of the FCC  Rules. These limits are designed to provide reasonable 
protection against harmful interference in a residential installation.  This  equipment  generates  uses  and  can 
radiate  radio  frequency  energy  and,  if  not installed and used in accordance with the instructions, may cause 
harmful interference to radio communications. However, there is no guarantee that interference will not occur 
in a particular installation.  If  this equipment  does cause  harmful interference to  radio  or television  reception, 
which can be determined by turning the equipment off and on, the user is encouraged to try to correct the 
interference by one or more of the following measures:  

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  Reorient or relocate the receiving antenna.  

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  Increase the separation between the equipment and receiver.  

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Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.  

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  Consult the dealer or an experienced radio/TV technician for help.  

This device complies with part 15 of the FCC Rules. Operation is subject to the following 
two conditions: (1) This device may not cause harmful interference, and  
(2)  this  device  must  accept  any  interference  received,  including  interference  that  may  cause undesired 
operation. 

Summary of Contents for D503BT

Page 1: ...b increase clockwise and decrease counterclockwise Treble Knob increase clockwise and decrease counterclockwise VOL increase clockwise and decrease counterclockwise Bluetooth antenna bluetooth is optional Input interface of audio Such as CD DAC decoder mobile phone TV etc red to right channel input white to left channel input Speaker Output red to positive black to negative L to leftspeaker and R ...

Page 2: ...ction Press the power button and press the power button again to enter the Bluetooth connection mode At this time you will see the blue light flashing Turn on your mobile phone and search for the device You will see DROK AUDIO that is it Click the connection to use the Bluetooth function Already Specifications Maxpower output 50W 2 4Ωload Frequency Range 20Hz 20kHz 3dB Headphone Maxpower output He...

Page 3: ... of time After a period of time off it was working again A Normally in this case the amplifier is overheat protected and the output power may have exceeded the designed power so you can lower the volume a little and try again Q why does the volume of the machine stay the same while the sound of different audio sources such as CDS and mobile phones is different A The output range of different types...

Page 4: ...terference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures ϋϋ Reorient or relocate the receiving antenna ϋϋ Increase the separation between the equipment and rece...

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