Earthquake Sound SUB-80X - Manual (Page 3)

Subwoofer positioning is integral to the successful application of any surround
sound system. It is very important to keep in mind that the proximity of the
subwoofer to a wall or a corner contributes to an increase in efficiency (SPL)
because of the "mirror effect" also referred to as "corner loading".
It is therefore advisable that you place the SUB-80X near a wall, or preferable in
the corner of the room. That will increase the subwoofer effect by 2 to 3 decibels,
without raising the volume control of the SUB-80X.
The fine tuning process includes creating a smooth transition of music between
the subwoofer and the next speaker up: usually a woofer or a mid-range. As
shown in the graph below; a smooth transition between lower and upper bass is
directly relative to the crossover setting and the capability of the next woofer up
to reproduce lower frequencies. Keep in mind that vocals extend down to 70Hz,
adjust your SUB-80X accordingly.
Fine Tuning:
Original Input Signal
Smooth Transition Between
Lower and Upper Bass
IDEAL
CROSSOVER SETTING
LOWER
BASS
UPPER
BASS
Gapped Transition Between
Lower and Upper Bass
OVER GAPPED
CROSSOVER SETTING
LOWER
BASS
UPPER
BASS
Uneven & Gapped Transition
Between Lower and Upper Bass
OVER GAPPED
CROSSOVER SETTING
LOWER BASS ENCROACHING
ON UPPER BASS
LOWER
BASS
UPPER
BASS
CENTERED POSITION
(RECOMMENDED)
WIDE SCREEN /
FLAT PANEL
RIGHT
FRONT
RIGHT
REAR
LEFT
REAR
LEFT
FRONT
SUB-80X
VIEWING POSITION
CORNER LOADING
(HIGHLY RECOMMENDED)
WIDE SCREEN /
FLAT PANEL
RIGHT
FRONT
RIGHT
REAR
LEFT
REAR
LEFT
FRONT
SUB-80X
VIEWING POSITION
VENTILATION DUCT
SUB-80X
BASEMENT LOADING
(STEALTH APPLICATION)
Listening Room & Subwoofer Position: Positioning Examples