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18
5SERgS-ANUAL
There are two main methods for adjust-
ing the level, crossover frequency and
phase of the Sunfi re Subwoofer to match
a sys tem:
• Bob Carver’s preferred method:
By listening and making the
adjustments to suit your taste.
• Laboratory method: By measuring
the output and adjusting for a fl at
frequency response.
Excellent results can be obtained if you
make the adjustments based on simply
listening. This is Sunfi re’s preferred meth-
od as it allows the system to be voiced
based on what sounds the best, whereas
lab o ra to ry-fl at frequency response can
often be clinical and less than ex cit ing.
The following procedure is for those
who prefer a more methodical and scien-
tifi c ap proach. This excerpt is from “The
Audio Critic,” issue 24, page 31, written
by con trib ut ing editor David Rich, and is
reprinted here with their kind permission.
You will need a test CD with low-fre-
quen cy warble tones, and a sound pres-
sure-level meter. The Radio Shack
®
SPL
meter will do fi ne, as will the Stereophile
®
test CD.
“Step 1. Disconnect the subwoofer and
run the main speaker with a tone in its
pass band (80-100Hz). Measure the level.
Step 2. Disconnect the main speaker
and reconnect the subwoofer. Set the
sub woof er to its highest crossover
frequency. Set the level control of the
subwoofer to give the same sound pres-
sure level with the same tone you used
in Step 1.
Step 3. With both the subwoofer and
the main speaker connected, measure
the level of the tones at the available
fre quen cies. Because the crossover
is set too high, you will have a peaked
response. Adjust the cross over control to
get the smoothest response.
Adjusting the controls
Step 4. Use the phase control to make
the response even smoother. It has its
biggest effect at the crossover fre quen cy.
You can iterate between the crossover
and the phase controls. Keep your hands
off the level control! It was set correctly
in step 2.
Step 5. Listen to the subwoofer.
Resist all temptations to turn up the level
control. Play something with really deep
bass to confi rm that your subwoofer is
working.”
Control settings
Use this drawing to record some of
your favorite settings.