SVS SB13-Ultra - Manual (Page 29)

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SVSound ™ STA-800D/1000D Equipped Subs
Measuring In-Room Frequency Response:
In order to use the PEQ effectively, you must measure the in-room FR of the subwoofer at the listening
positions. This can be done manually using test tones and a spreadsheet, or it can be accomplished using
software such as “TrueRTA”, or “Room EQ Wizard (REW)”. SVS does not provide technical support on the
setup and use of any software, but it can make measuring the subwoofer FR easier and faster than manual
methods. An active user forum for REW exists on the Home Theater Shack web site, http://www.homethe-
atershack.com/forums/rew-forum/
To measure the subwoofer FR using a manual method, you will need a SPL meter, a basic working knowl-
edge of Microsoft Excel (or other spreadsheet program), and a means to generate sine wave test tones.
There are several sources of sine waves and/or tone generators on the internet. A popular tone generator is
the NCH Tone Generator ( http://www.nch.com.au/tonegen/index.html ) which is available for time-limited
trial use, and may also be purchased for a nominal fee. You can download working Excel spreadsheets
from the SVSound web site at:
http://www.svsound.com/techsupport/Subwoofer_Frequency_Response.xlsx
and
http://www.svsound.com/techsupport/Speaker_And_Subwoofer_Combined_Frequency_Response.xlsx
Place the SPL meter on a tripod and set the controls to C-weighted, Slow, and the 70 dB scale (you may need
to alter the dB scale during the measurement process). Place the meter at head level at the primary listening
position with the meter pointed toward the ceiling at a 90 degree angle.
To set the overall test level, play a 25 Hz frequency and adjust the subwoofer Volume (option 1 below) or the
processor master volume (option 2 below) until the SPL meter reads about 75 dB at the listening position.
Run each tone only long enough to get a stable reading from the meter (about 5-6 seconds), and then give
the subwoofer about 10 seconds to cool off between test frequencies.
Setup & Use of PEQ
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