User manual

5
e Unbalanced (¼") Input – Unbalanced input of the amplifier. The ¼”
input overrides the balanced XLR input if both are connected.
r Balanced (XLR) Input – This female XLR-type connector accepts a
balanced or unbalanced line level signal.
t Balanced ( XLR) Thru – This male XLR connector passes any signal
sent to the balanced XLR input jack (whether or not the amp is switched
ON). Note: THRU passes ONLY the XLR input and NOT the ¼" input!
u Power Switch – Switches the amplifier ON or OFF.
i Standby Switch - Standby controls high voltages to the tubes. Allow
60 seconds after powering up before setting standby to the ON position.
o Ground lift – When your system produces a hum or buzz from ground
loop, the lift switch can often eliminate it. Works on all inputs.
p Master Level Control - Adjusts the amplifier’s overall volume.
a Tweeter Level – Adjusts the volume of the high frequency component
of the amplifier’s sound.
TONE TIP: The high-frequency response is “flat” with the Tweeter Level at 12 o’clock. The
“sweet spot” will vary depending on your listening environment and the position/placement
of the unit. Turn the control downwards for a warmer darker tone or increase for added
brightness and sparkle. (NOTE: The MB-50 has active presence instead. See p. 6)
s Speaker Switch – Sets the function of the Speaker Jackd as follows:
Switch Setting
Internal Speaker Jack Function
ON:
ON ON
OFF:
OFF
*
ON
EXT. AMP:
In this position, the jack is converted from an output to an
input for the internal speaker allowing the use of an
external amplifier.*
†
*WARNING: Do not operate the internal amp with no speaker or load connected!
†
NEVER connect an external amplifier to the speaker jack when the speaker switch
is not set to Ext. Amp as doing so could damage both amps. When using the
Powered Cab or Wedge as a passive cabinet, the amps should always be switched
OFF and UNPLUGGED.
f Cooling Fan - Operates quietly when the amp is powered on.
g Power Input - Connect the supplied AC line cord to provide power to
the amp. The power inlet also houses the Fuse Compartment which
must be opened to replace the fuse. In order to convert the power amp
from 115v (US) to 230v (EU) operation (or vice versa) change the fuse to
the appropriate value (see specs on pp. 13–17), then rotate and replace
the fuse compartment.