Practical Devices XM3 - Gain Boost Jumpers; Increasing Gain; When to Use Gain Boost; Installing;Removing Jumpers

With the volume knob at full, your XM3 will
deliver +13dB of gain. Additionally, you can
install the Gain Boost jumpers, which will give
you an extra +10dB of gain, for a total of
+23dB.
In order to get the best possible noise floor,
you should not install the Gain Boost jumpers
unless: a) the volume of your headphones is
too quiet, and, b) you have already tried turning up the volume of your
Gain Boost Jumpers
Gain Boost Jumpers
10
Usually, the Gain Boost jumpers are only needed when using
headphones which have an impedance greater than around 150
To install or remove the Gain Boost jumpers:
1. Disassemble the unit (see page 8)
2. To install the jumpers, place a jumper of each pair of riser pins.
(Hint: if you are removing the jumpers, place each jumper over
one pin only, so you don't lose them).
3. Re-assemble the unit.
Jumpers are installed.
Gain boost is +10dB
Jumpers are removed.
Gain boost is disabled.
Jumpers are removed, but
are placed over a single
pin so they don’t get lost.
Gain boost is disabled.