Wheatfield Audio Wheatfield Audio HA-4 Users Manual
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Connecting your HA-4
Power
IMPORTANT: Before you connect the power cord to the HA-4, make sure that the
voltage selector switch is set correctly for your local power. If you are in North
America, Japan, or anywhere else that your line voltage is between 100V and
135V, set the voltage selector to "115". If you are in Europe, or anywhere else
where the voltage is 200-250V, set the voltage selector to "230".
If you set the voltage selector incorrectly, one of two things will happen. If you set
it to "230" when it should be "115", the amplifier will not work correctly, but no
damage will be done. If you set it to "115" when it should be "230", you will cause
the fuse to blow. Correct the switch setting and replace the fuse (fuse types are
listed at the beginning of this manual) and you should be OK.
Audio Inputs
Connect the Left and Right inputs of the HA-4 to your audio source with a decent
pair of RCA interconnect cables. Any normal line output (between about 1V RMS
and 3V RMS) can drive the HA-4. CD players, pre-amps, tuners, and computer
sound cards are all compatible with the HA-4 input.
The input impedance of the HA-4 is 100k ohms. Since it is so high you can
connect the HA-4 input in parallel with another component (like a power
amplifier) using "Y" cables, if you so desire.
Headphones
Plug your headphones into the standard 1/4" stereo headphone jack on the rear
of the HA-4.
The HA-4 can drive any stereo headphones, from 8 ohms up to 600 ohms. It has a
low output impedance (about 2.5 ohms), and can drive up to 250 mA and/or +/-
18V, which provides plenty of headroom for any headphones.
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