FUNCTIONS & FEATURES:
Rack Mountable - Requires (2) Spaces (3.5”)
Variable Low Pass Filter
Auto On/Standby Function
Speaker Level Inputs and Outputs
Line Level Inputs and Outputs
Balanced Line Inputs and Outputs
DC Protected Fixed High Pass Filter
Status LED: Red = Standby, Blue = Active
12v Trigger Function
Output Monitor LEDs
115 VAC and 230 VAC Input
Voltages (auto selected)
Fan Cooled - 8 Speed Stages
Phase Switch
SPECIFICATIONS:
Mono Output Power:
250 watts at 8 ohms<0.05 THD
350 watts at 4 ohms<0.05 THD
Total Harmonic Distortion:
<0.05 @ 1 watt 4 ohms/100Hz
Signal to Noise Ratio:
86db Below Rated Output
Crossover Section:
High Pass Filter: 18 Hz/30db/octave (fixed)
Low Pass Filter: 50 Hz to 150 Hz/18db/octave
(variable with bypass switch)
Current Draw:
6.2Amps @ 350W/4ohms/115VAC/60Hz
Dimensions:
Width: 19” (483 mm) (rack ears installed)
Width: 17” (432 mm) (rack ears removed)
Height: 3.5” (89 mm)
Depth: 13.625” (346 mm)
Shipping Weight:
31 lbs (14 kg)
*All specifications subject to change.
SA255 MKII - TIPS
Speaker Output Connection:
To use the binding-post speaker terminals (Rear Panel Detail
#17) with bare wire, unscrew the collar until the hole through
the center post is visible under the collar. Insert the bare end
of the wire through the hole in the post, then screw the collar
back down until the connection is tight. The holes in the center
of the collars are intended for banana-type connectors.
Speaker Level input Connection:
Use this installation method where the receiver/processor
does not have a subwoofer output or a volume controlled
preamp line-level output. Connect you receiver or amplifier’s
front left and right speaker terminals to the left and right
terminals on the SA255 that are marked “Speaker Level Input”
(Rear Panel Detail #8). Connect the left and right terminals
on the SA255 that are marked “Speaker Level Output” (#8) to
the corresponding terminals on the back of your front left and
right speakers. This method will also work for whole house
audio distribution systems since some multi-channel whole
house audio amplifiers do not have a line level subwoofer
output. If the amp speaker level input is after a speaker volume
control, the SA255 volume will track with the volume control.
Line Level Connection:
Use this method where the receiver/processor is equipped
with a subwoofer output or a volume-controlled preamp
line level output. Use RCA-type patch cords to connect the
line-level inputs on the SA255 (Rear Panel Detail #11). If your
receiver or amplifier only has one subwoofer output jack, then
you may connect the subwoofer output on your receiver/
preamplifier to either the left or right line-level input on the
SA255. It makes no dierence which jack you choose.
Balanced Line Connection:
This method is used when the SA255 is placed between a
preamplifier and power amplifier that connect with 3-pin XLR
type connectors (Rear Panel Detail #19 & #10).
Phase Control:
The Phase switch (Front Panel Detail #5) determines whether
the subwoofer’s piston-like action moves in and out in phase
with the main speakers or opposite the main speakers. There
is no correct or incorrect setting. Proper phase adjustment
depends on several variables such as subwoofer placement
and listener position. Adjust the Phase switch to maximize
bass output at the listening position.
Remember, every system, room and listener is dierent. There
are no right or wrong settings; this switch oers the added
flexibility to adjust your subwoofer for optimum performance
for your specific listening conditions. If at some time in the
future you happen to rearrange your listening room, you
should experiment with the Phase switch in both positions,
and leave it in the position that maximizes bass performance.
Crossover Adjustments:
The crossover Frequency control (Front Panel Detail #1)
determines the highest frequency at which the subwoofer
reproduces sounds. If your main speakers can comfortably
reproduce some low-frequency sounds, set this control to
lower frequency setting, between 50Hz – 80Hz. This will
concentrate the subwoofer’s eorts on the ultra deep bass
sounds required by today’s films and music. If you are using
smaller bookshelf speakers that do not extend to the lower
bass frequencies, set the low-pass crossover control to a
higher setting, between 80Hz – 150Hz.
Level Control:
The Volume control (Front Panel Detail #7) will adjust the level
of the subwoofer relative to the rest of the system. Proper
level adjustment depends on several variables such as room
size, subwoofer placement, type of main speaker and listener
position. Adjust the subwoofer level so that the volume of
the bass information is pleasing to you. The amplifier will
track input level changes and adjust volume relative to input
source level changes. Front panel level control determines the
maximum level of output.
Full Range Operation:
To bypass the low-pass filter, set the Low Pass Filter switch
(Rear Panel Detail #13) to “FULL RANGE”. The amplifier will
then reproduce the full audio spectrum.
