NKI1480B DAX60 and DAX120 Amplifiers—Installation
Page 9 of 18 (Jul-98)
power source, such as Rauland's Model 6430 Pink-Noise Source and Model 6431
1/3-Octave Equalizer. Do not mix floating and grounded accessories.
Power Connection
Plug the power cord into a 120-V, 60-Hz, three-wire grounded outlet that can
provide at least 935 watts (DAX6O) or 11O5 watts (DAX12O). Although the
amplifier circuits by themselves consume no more than 175 watts (DAX6O) or 345
watts (DAX120), connecting another device to the DC output could consume
another 40 watts of power, and a total load of 720 watts could be connected to the
three AC sockets. Check the local regulations before installing permanent AC lines
and plugging in the equipment.
Converting the Amplifiers to 240 VAC
If operation from a 240-VAC power source is desired, remove the front cover and
locate the "120V/240V" switch inside the amplifier, on the right. Use a small
screwdriver to slide the switch to the "240V" side. Re-secure the front cover.
Replace the fuse with a fast-blow, 240-volt fuse with half the current rating of the
supplied fuse; the new value would be 1.25 Amps for the DAX6O, 2.5 Amps for
the DAX12O (see "REPLACING THE FUSE," below). Replace the plug on the
power cord with one approved for 240-VAC operation.
Important:
When the amplifier is connected to a 240-volt supply, its three "120 VAC"
convenience outlets will supply 240 volts. Accordingly, they should not be used
when the amplifier is connected to 240 volts
Setting the "Input Level” Control
The input-level control, marked "LEVEL" on the rear chassis below the output
transformer, can be adjusted with a 1/4-inch flat-blade screwdriver: turning the
control clockwise will increase the output level. This control should be set so that
the maximum possible input signal will not cause the output to clip. After this
control has been adjusted by the installer, it should be left alone.
Replacing the Fuse
A current surge during operation may cause the fuse to blow. To restore power to
the amplifier, first ascertain what the problem is and correct it before replacing the
