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The Effects Blend functions only when the Effects Loop is being used. It is activated when a 1/4"
phone plug is inserted into the Effects Receive jack (see the “Effects Loop” section for more
information).
Note: Pulling the Effects Blend control knob outward defeats the internal limiter circuit. To
activate the limiter, push the control in.
MASTER VOLUME
The Master Volume adjusts the level being sent to the power amplifier in your Bass 350—it con-
trols the overall volume of the unit. It does not affect the level of the record XLR output in the
“line” position.
Losses in level caused by effects units can be recovered by increasing the Master Volume.
FAN & FAN DEFEAT SWITCH
The power amp is cooled by an extruded aluminum heatsink and a thermostatically controlled fan.
This fan turns on when the heatsink reaches 50 degrees centigrade and turns itself off when the
heatsink reaches 40-45 degrees centigrade. This allows for “silent running” when used at low vol-
umes. Be sure to leave at least a 1/2" clearance between the vent on the left side of the Bass
350 and the side of any rack case or enclosure you should happen to install your amp in. This will
allow for the heat generated by internal components to escape.
Setting the Fan Defeat Switch to the “Fan” position activates the internal cooling fan’s normal
operating mode. Setting the Fan Defeat Switch to the “Defeat” position deactivates the cooling
fan regardless of the internal temperature of the unit. For this reason, it is recommended that the
Fan Defeat Switch be set to the “Fan” position for the majority of the time that the amplifier is in
operation. Please note that it is normal for the cooling fan to be audible at low levels. We recom-
mend deactivating the fan only in situations where the noise floor is so low that normal fan noise
might be noticeable or distracting, such as recording situations where a microphone is used in
close proximity to the unit.
POWER ON/OFF SWITCH
Setting the Power On/Off switch to the “On” position switches on the Bass 350. The power LED
will light up. Setting the Power On/Off switch to the “Off” position switches off the unit.
LIMITER/COMPRESSOR CIRCUIT
The Limiter found in the Bass 350 is a soft knee type limiter. The Limiter circuit is located after
(post) the Master Volume and before (pre) the power amplifier. Therefore, the limiter is driven by
the Master Volume. Its threshold (starting point) is preset by the factory so that the user can get
maximum overall apparent volume without unduly overdriving the power amplifier or internal speak-
ers. This can be helpful in preventing speaker damage when running your system at high volume.
You may either activate or defeat the limiter via the Effects Blend Control. The “In” position acti-
vates the Limiter Circuit. The “Out” position defeats this feature.
LIMITER ACTIVE LED
When the threshold (starting point) of the Limiter Circuit is reached, the Limiter Active LED will
light, indicating that the Limiter Circuit is active. The Limiter LED will be inactive when the Limiter
is defeated or when playing at lower levels.
5
BASS 350 USER GUIDE