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External Power Amplifier - Options
While the Genesis's built in amplifier is quite powerful and capable of handling several pairs of
speakers (stable to 1/2
Ω
), it may be necessary to provide additional amplification for a room
or several rooms should more power be required for a particular room (each room is rated to
handle up to 4 pair of 8
Ω
speakers or 2 pair of 4
Ω
speakers). An additional power amplifier may
also be used when a particular room(s) have a significantly low impedance load that when
added to the rest of the rooms on the system, bring the Genesis below its 1/2
Ω
impedance load.
A
If you require serious power for more than typical background music, ADA recommends
using the PF-250 Power Amplifier. The PF-250 provides 150 Watts per channel at 8
Ω
and 250 Watts per channel at 4
Ω
. The PF-
250 is stable down to 2
Ω
. The PF-250 is fan
cooled and provides high-current output
which more effectively drives any speaker,
especially in-wall speakers.
B
If you are running several speaker pairs
where the overall impedance is below 2
Ω
(i.e. 6 pair of in-wall speakers) or you are
running several speaker pairs where more
power is required (i.e. 4 pair of outdoor rock
speakers), ADA recommends using the PF-201 Low Impedance Power Amplifier. The
PF-201 is stable below 1/2
Ω
and can run over 16 pairs of 8
Ω
speaker in parallel (32
speakers). The PF-201, while providing 60 Watts per channel at 8
Ω
, kicks out over 240
Watts per channel at 1/2
Ω
. The PF-201 is fan cooled and provides high-current output
which more effectively drives any speaker, especially in-wall speakers.
C
If you require more power, are running a
speaker load down to 1
Ω
, and have limited
rack space, ADA recommends using the PT-125 Single Rack Space Power Amplifier.
The PT-125 Provides 50 Watts per channel at 8
Ω
, 100 Watts per channel at 4
Ω
, and is
stable down to 1
Ω
. The PF-125 is fan cooled and provides high-current output which
more effectively drives any speaker, especially in-wall speakers.
D
If you are operating one or several passive sub-woofers, ADA recommends using a
parametric bass amplifier which operates in the 20Hz to 200Hz frequency range.
Special front panel controls permit adjustment of the bass level, frequency roll-off point,
and the bandwidth of the roll-off curve. Thus, you can custom tune the bass signal after
the room has been furnished. ADA manufacturers two different parametric bass
amplifiers designed for different power re-
quirements.
PBA-50 - 50 Watts Mono at 8
Ω
- Stable to 2
Ω
- Single Rack Space - Fan Cooled
PBA-500 - 500 Watts Mono at 8
Ω
- Stable to
2
Ω
- Triple Rack Space - Fan Cooled
ON
OFF
PF-250
FUSE
F U
S
E
FU
SE
RIGHT
LEFT
POWER
POWER
PF-201
PT-125
ON
OFF
POWER
OUTPUT LEVEL
PBA-50
PARAMETRIC
BASS
AMPLIFIER
LEVEL
FREQUENCY
BW
BASS EQ
LEVEL
FREQ
BW
PBA-150
PARAMETRIC BASS AMPLIFIER
ON
OFF
POWER
