C.E.C. HD53N, Owner'S Manual

10

Before connecting or disconnecting the headphone plugs, 
turn the volume knob to the minimum and take off the 
headphones or earphones from your ears to avoid a sudden 
excessive sound pressure or noise, which may cause hearing 
impairment.

❸

OUTPUT(HP/SP) selector button

Press the HP/SP button to select an output from headphone and speaker. The 

selected output indicator “HEADPHONE” or “SPEAKER” lights up in the display.

*Before changing the output, turn the volume to the minimum and take off the 

headphones or earphones from your ears.

❹

GAIN button

Press the GAIN button to change the amplifi er gain setting to LOW GAIN or HIGH 

GAIN. The corresponding GAIN indicator lights up in the display.

LOW GAIN is recommended for the beginning of use. In case that you feel a lack 

of sound level due to the headphone’s or speaker’s efficiency and sensitivity, 

change to the HIGH GAIN.

*The volume knob position where HD53N exceeds the maximum output power 

varies with the connected devices and input sources. When the sound is distorted 

the power may exceed the maximum already. In this case, change the gain setting 

to LOW GAIN or decrease the volume.

❺

INPUT selector button

Press the INPUT button to select an input from the balanced XLR or unbalanced 

RCA. The corresponding indicator lights up in the display.

*Before changing the input, turn the volume to the minimum and take off the 

headphones or earphones from your ears.

❻

VOLUME knob

Turn the VOLUME knob clockwise to increase the volume, and turn the knob 

counterclockwise to decrease the volume.

*Due to the Intelligent Gain Management (IGM) volume control system, small 

sound still comes out from headphones or speakers even at the minimum volume 

knob position. To mute the sound completely, stop the playback of the connected 

source device.

*Due to the potentiometer character, the sound level of the both channels may be 

unbalanced in a very small range of just the starting point. Passing through the 

starting point by increasing the volume a little more, the channel balance should be 

perfect soon.