SV Sound SVS PB13 specifications Advanced Features Subsonic Filter and Port Tuning, SV Sound, Page

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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

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

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.