Mesa/Boogie UNIVERSAL BASS AMP Guia De Inicio Rapido página 11

TREBLE CONTROL: This active eq control is a shelving filter that is responsible for the amount (or volume) of high
frequencies present.
MASTER VOLUME CONTROL: Is responsible for the level of signal being sent to the internal power amplifier, and
determines the overall playing volume of the amplifier. Combinations of gain and master volume settings will allow
exploring overdriven and clean settings at the desired volume
POWER LIGHT: This blue LED indicates that the amplifier is connected to a power source and is switched on, operating
correctly.
PROTECT LED: This red LED indicates that the amplifier has entered protect mode and is either protecting itself from an
external fault (such as a shorted speaker cable or defective speaker), or that there is an internal fault within the amp itself.
LIMIT LED: This amber LED indicates that the power amp is nearing maximum power and is entering the soft clip/limit
output tube emulation mode. Soft clip/limit output tube emulation mode mimics many of the desirable characteristics of
tube amp output stage overdrive while eliminating the common, often harsh solid state clipping artifacts.
CHANNEL SWITCH: (2 channel amps only) This switch and indicator/tally LEDs select and show the active status of
each channel.
OUTPUT OVERDRIVE SYMMETRY CONTROL: When present, allows adjustment to the symmetry of the output soft clip
circuitry waveform just like how many tube phase inverters and tube output stages behave in real world tube amplifiers.
This action only affects the operation at or near the rated power level of the amplifier and is a subtle voicing feature that
can be used in any position without fear of harming the amplifier.
POWER AMPLIFIER DAMPING SWITCH: When present, adjusts the power amplifier damping factor from LOW (typical
tube power amplifier) to MEDIUM (some tube and solid state power amplifiers) to HIGH (typical solid state power
amplifier). Low results in a looser feel, high results in a tighter feel. This is a subtle voicing feature that also can affect the
feel of the notes especially in the lower register, there is no right or wrong setting.
General description of REAR PANEL features and functions (not all models have all features):
POWER SWITCH: Is used to turn your amp on and off by disconnecting the amplifier from the power source (mains). 800
Watt models have protection circuitry that results in a ~20 second delay in the power-up sequence if you turn the
amp on and off multiple times within that time window.
IEC POWER INLET: This power inlet conforms to the IEC C-14 type standard, and is to be used with a mains cordset
containing a matching connector, and appropriate plug for the intended market.
MAINS POWER REQUIREMENTS: All Subway amplifiers are designed with a universal, auto-ranging power supply that
automatically adjusts to line voltages between 100-120V and 220-240V, 50 or 60Hz. The power supply is internally
monitored by supervisory and protection circuits and contains a non-user replaceable fuse that opens in the unlikely event
of a major failure. The amplifier is designed to be use with grounded or earthed power, meaning that the chassis is always
maintained at ground/earth potential. Never remove the grounding/earthing pin from the power plug, or alter the power
cable.
COOLING FAN: The 800 watt Subway models incorporate a low speed, high reliability cooling fan. Be sure the fan's inlet
and head's vent slots are not blocked or the amplifier's protection circuits will shut the amplifier down due to a thermal
fault condition.
SPEAKER OUTPUTS: All Subway models include SpeakOn jacks wired industry standard 1+/1-. These jacks do NOT
accept 1/4" (6.35mm) plugs for safety reasons. Do not connect the speaker outputs to anything except speakers (no load
boxes, no speaker level DI's or switchers). For added versatility, all SW heads may be operated without a speaker load
connected
ALLOWABLE MINIMUM SPEAKER LOAD: All 350 watt models are rated to drive a minimum 4 ohm load. All 800 watt
models are rated to drive a minimum 2 ohm load, with the impedance selector switch on the back panel set to the 2 ohm
position.
IMPEDANCE SELECTOR SWITCH: selects the operating mode of the power amplifier. In general, set this switch to the
impedance closest to the speaker load you are connecting. In the case of 2.67 ohm loads, always use the 2 ohm position.
You may select a higher impedance setting than the load you are using which will result in the head delivering reduced
power which is perfectly safe and may be desirable in certain situations.
EFFECT (FX) LOOP: A serial (series) effects loop, when provided, consists of 1/4" (6.35mm) send and return jacks. These
jacks are line level, and a convenient PREAMP OUTPUT/ INPUT patch point that can be used in many ways. Always use
instrument/line level shielded cables.
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