Congratulations on your purchase of the Electro-Harmonix HEADPHONE AMP! Now you can rock out anywhere without disturbing your neighbors. Simply use a 9V battery and any pair of headphones you like, as long as they have an 1/8" plug attached to them.
VOLUME â€” Sets the output level.
INPUT JACK — Connect the output of your instrument or effects pedal to this 1/4" jack. The input impedance presented at the INPUT jack is 100k ohm.
OUTPUT JACK — Insert the 1/8" stereo plug from your headphones into this jack.
-OPERATION AND WARNINGS-
Power, from the internal 9-volt battery is activated by plugging into the output. The headphone cable should be removed when the unit is not in use to avoid running down the battery. A pop may occur in the headphones when inserting or removing the plug from the headphone jack.
To change the 9-volt battery, you must remove the 4 screws on the bottom of the HEADPHONE AMP. Once the screws are removed, you can take off the bottom plate and change the battery. Please do not touch the circuit board while the bottom plate is off or you may damage a component.