marley
DUAL-DRIVE CLASS-A HEADPHONE AMPLIFIER / PREAMP
REVISION 1.0 – NOVEMBER 2013
Copyright © 2013, M2Tech Srl
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6.1. Volume Setting
Volume setting is performed by encoder knob rotation (Figure 1,3). Depending on the
output configuration, it is possible to set one or two volumes.
When the
MARLEY
is configured in balanced mode, the two stereo amplifiers which are
used in this mode are bridged and make for a single balanced amplifier. This is why
only one balanced output is present and why only one volume control can be set
when using the balanced headphone connection (Figure 4).
When the
MARLEY
is configured in dual single-ended mode, each amplifier drives one
jack output. Each amplifier has its own dedicated volume control, it is therefore
possible to set the listening level of each amplifier independently. Two volumes are
thus shown: “VOLA”, related to output “A,” and “VOLB”, related to output “B”. The “>”
sign indicates which volume can be set. As shown in Figure 5, output “A” volume can
be set by rotating the encoder knob.
To set volume for output “B” it is necessary to push the encoder knob once, so that
the “>” moves to the front of “VOLB” (Figure 6).
VOLA:-40DB
IN:1 >VOLB:-40DB
Figure 6
NOTE: After setting output “B” volume, the button to the left of the front panel
may be pushed to restore equipment’s “idle” status as in Figure 4. As an
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