Hafler HA75 User manual - page 8
HA75 'TUBE HEAD' HEADPHONE AMP
Hafler
6
TeSTInG ConneCTIonS
Set all of the front panel knobs and switches to the start position with
AB select to A, volume to zero, feedback control fully counter clockwise,
focus switch off and loudness (VOX) to the middle position.
uSInG THe Ab SeLeCT SWITCH
The intent is simple: let’s say you have your regular hi-fi source such as
a CD player or preamp connected to input-A and then the audio output
from a laptop computer connected to input-B. This would enable you to
quickly switch between sources without having to disconnect one or the
other. Connecting the HA75 in between the hi-fi preamp and power amp
using the Thru output also lets you route the signal from your laptop to
your power amp using the HA75 to select the active input and control
the levels.
Plug in your headphones and then turn up the source audio system to
a low level. Slowly increase the level on the HA75 using the big volume
control knob in the middle. Testing at low volume will prevent damage
to your headphones and protect your hearing should a connection be
faulty. If no sound, check to make sure you have the front panel select
switch set to input-A. If all seems OK, increase the volume until you have
reached a comfortable listening level.
In the studio you can use the XLR inputs to connect from your recording
system and the RCAs to listen to guest mixes from iPhones or tablets.
Simply make up the appropriate cable and connect to the HA75 input-B
RCAs and select when needed.
Input-B
Input-B
Input-A
Input-A