16
Bass Shape Control
The rolloff rate and the shape of the low-frequency corner of a
subwoofer affect its sound. For example, a subwoofer with a
“soft” corner and a gradual rolloff rate below its range of operat-
ing frequencies will generally give a tight and rhythmically “fast”
character. A system with a low-frequency corner that is squarer
and rises slightly before falling off quickly will provide a more
robust low-frequency sound. Additionally, the faster rolloff will
give a better compromise in terms of apparent bass output
versus woofer power capability. The Snell XA Towers offer both
options via a rear panel switch on the XA 75
ps
and via the remote
control of the XA 90
ps
. Some people prefer the “Reference” posi-
tion for music and the “Cinema” position for movies. Try either
setting and use whichever one suits your mood, your room
acoustics, or your program material.
XA Towers, Crossover Controls
Setting the Placement Switch (Input Terminal Plate, far
left switch)
Freestanding placement:
Set the Placement Switch to NORMAL.
Boundary placement:
Set the Placement Switch to BOUNDARY.
Asymmetrical placement:
Based on your room layout, you might find that one speaker
performs best in the BOUNDARY setting, and the other in the
NORMAL setting.
Setting the Treble Level (Middle Switch XA 75
ps,
Remote
Control XA 90
ps
)
¤ The Treble Level Control contours the “brightness” of the
XA Tower. Turn the Treble Control to + to increase the high-
frequency output in situations in which the XA Tower
sounds dull.
¤ Turn the Treble Control to - when the XA Tower is overly
bright, especially in highly reflective rooms.
¤ The + position is closer to ”anechoically flat,” although much
recorded music will be preferred in the - position.
¤ The - position is similar to a processor cinema ”re-EQ” setting.
Setting the Rear-Firing Tweeter (far right)
¤ The rear-firing tweeter adds spaciousness and ambiance to
the soundstage, and is particularly effective when the XA
Tower is placed at least 12 inches (30cm) from a back wall.
Turn the Rear-Firing Tweeter OFF When:
¤ The XA Tower is placed directly against a back wall.
¤ The soundstage sounds too bright for your taste.
Center Channel—Setting the Placement Switch
TV top placement:
Set the Placement Switch to NORMAL.
Cabinet placement:
Set the Placement Switch to BOUNDARY.
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