3. Bridged Mono mode
Bridged Mono mode straps both amplifier channels together to make a very powerful, single
channel monaural amplifier. One channel “pushes” and the other “pulls” equally, doubling the
power over that of either channel alone. Signal is applied to the channel A input only. Both
attenuators are used to control signal level, in addition, both must be adjusted to the same
setting, either the 1/4” (TRS) or XLR input may be used.
Note: the channel B input connector (XLR and /or TRS) may be used to “loop through” the
channel A signal when in parallel or bridged mono model.
Use external caution when operating the amplifier in bridged mono mode. Never ground
either side of the speaker cable when the amplifier is in bridged mono mode; both sides are
“hot”. If an output patch panel is used, all connections must be isolated from each other and
from the panel. There commended minimum nominal load impedance in the bridged mono
mode is 4 Ohms, which is the equivalent to driving both channels separately at 2 Ohms.
Driving bridged loads of less than the recommended minimums will activate the IGM
circuitry.
E. User Precautions
1. Speaker protection
All loudspeakers have electrical, thermal and physical limits which must be observed to
prevent damage for failure. Cone or compression drivers can be damaged (sometimes to the
point of failure) from excessive power; low frequencies applied the high frequency drivers,
severely clipped waveforms, and subsonic signals.
Mid and high-frequency trans-dupers-compression driver in particular are highly susceptible
to damage from overpowering, clipped waveforms, overpowering, clipped waveforms, or
frequencies below their rated pass band. When using an electronic crossover, make
absolutely certain that the low and mid bands are connected to the correct amplifiers and
driver and note accidentally connected to those for a higher or lower frequency band.
2. Maintenance
Amplifier required no routine maintenance other than occasional cleaning or replacement of
