Stereo Amplifier
--
speaker A output
--
33
33
speaker B output
to left speaker
to right speaker
Pre-out Main-in
Stereo Amplifier
L
R
8
connection & calibration - stereo system
connection and defaults
Connect the Tektonix or Volcanix subwoofer
to a stereo amplifier either via the high
level speaker inputs or the line level inputs.
Ensure the mains power switch is off and
•
connect the mains power cord.
Connect subwoofer to your stereo amplifier
•
using one of the methods on this page.
Using both connection methods
simultaneously is not recommended.
calibration
Switch on mains power switch (on the
•
rear panel).
Check the
•
volume
on your subwoofer is set
to the default level, -20dB .
Select desired
•
low pass
(crossover
frequency) setting on your subwoofer. As a
guide set the subwoofer low pass to 20Hz
above the main speakers low frequency
limit. (Refer to main speaker specifications
e.g. 60Hz-20kHz speaker would require
80Hz setting)
Set
•
phase
to 0°.
Set
•
power mode
to
auto
(middle position).
It is beneficial to select music that is familiar
to you when carrying out listening tests and
calibration procedures. As a suggestion play
clean unprocessed recordings that use double
bass, bass guitar, cellos, organ or kick drum etc
that cover a wide bass spectrum.
Begin by playing music and slowly adjust
the volume setting on the subwoofer to
your desired level. For final tweaking of
your subwoofer level you may wish to sit
in the primary listening position and ask an
assistant to adjust the volume setting on your
subwoofer.
Now set the phase switch. The correct phase
setting will produce the most bass. You may
need to listen to a variety of recordings to hear
any subtle change in bass energy. If no change
in bass energy can be heard between phase
settings, set phase to 0° default position.
Re-adjust volume if necessary.
You may wish to fine-tune the crossover
frequency/low pass setting. This will vary
the amount of overlap from the subwoofer to
the main speakers and increase or decrease
the level at those frequencies. The effect is a
strengthening or weakening of the upper bass
region. Unpleasant ‘woody’ or ‘chesty’ sound
qualities may suggest the low pass setting
selected is too high. If the sound lacks ‘body’
the low pass setting selected may be too low.
Re-adjust low pass setting, volume and then
phase. Re-evaluate results.
Tip
Connection Method 2: High Level Inputs
Not suitable for use with bridge-mode
amplifiers.
Connect the Speaker Level outputs on your
main amplifier to the Speaker Level inputs on
the rear panel of the subwoofer.
Also connect the Speaker Level outputs on
your main amplifier to each of your left and
right speakers. The subwoofer ‘senses’ the
speaker level signal. No additional load will be
placed on your amplifier. Be sure to maintain
correct phasing for each set of speaker leads,
red (po) to (+) and black (negative -)
to (-).
Where your amplifier has A & B speaker
outputs you may wish to connect your main
speakers to A and subwoofer to B. Use
amplifier A+B setting to activate subwoofer
and A only setting to mute subwoofer.
Connection Method 1: Line Level
Requires your amplifier to feature L&R pre-
out connections.
Use two Y cables to connect each Pre-out
•
channel on your amplifier (or pre-
amplifier) to the corresponding subwoofer
and main amplifier inputs. If main inputs
are not present on your amplifier
simply
connect the pre-outputs to subwoofer line
inputs.
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