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Advanced Features:
Subsonic Filter and Port Tuning
Your new SVS subwoofer not only comes with
our “Tri-Power” port flares, but custom port
plugs and variable subsonic filter which allow
your sub to be “tuned” to even lower frequen-
cies than its stock configuration. For most peo-
ple and most rooms, your SVS sub is already configured for the best blend of
extension (how deep/low your sub goes) and output (how loud it gets at a vari-
ety of bass frequencies). However, we know that bass is a very personal taste
and no two rooms will react exactly the same with any subwoofer. So we
includes custom “plugs” which, when inserted into a port, allows you the user
to experiment with a substantially lower “tune”.
As with all such devices, there are compromises when tuning a sub lower.
Installing one port block takes some capacity from upper reaches of bass, in-
stalling two port blocks naturally limits upper bass “headroom” even more. So
while deeper settings will indeed get more bass down low (where DVD and
music bass is more rare, but quite exciting!), you’ll sacrifice some total output
capacity above the stock tuning point of the sub (where bass is more common).
You should decide if the effect is pleasing on the sorts of movies and music
you enjoy.
How to do it? Remove your grill by prying up with our fingers along its metal
side. To insert a port plug, simply squeeze the foam on one end and press the
plug into a port flare until it is about 1” lower than the edge of the surface of
the sub. You can remove the plug by inserting your fingertips into the port
flare and squeezing and pulling on the foam plug at the same time. Be sure to
select the subsonic filter point on the back of your SVS amp which coincides
correctly with your new “tuning point”. NOTE: We strongly recommend
you do NOT run a lower subsonic filter point than your port plug configura-
tion would dictate — especially if you are running the subwoofer at high
sound pressure levels. Somewhat more moderate levels are doubly important
if you put the subsonic filter into the 10Hz mode (* contact SVS about details
on the use of this deepest mode). This simple table indicates the settings you
should use in setting up your sub blocks and the subsonic filter knob.
SVS Tuning Chart Subsonic Filter Knob
Stock tune (no ports blocked)
20Hz
With one port-blocked
15Hz
With two ports-blocked *
10Hz
With three ports-blocked
Sealed