Infinity ENTRA SUB, Owner'S Manual

4

ENTRA SUB

Power On

Plug your subwoofer’s AC cord into a wall outlet. Do not use the
outlets on the back of the receiver.

Initially set the subwoofer’s Level control 

to the “O” position.

Turn on your sub by pressing the Power button 

on the rear panel.

Turn on your entire audio system and start a CD or movie sound-
track at a moderate level.

Important Note:

The Entra Sub includes an Auto-On/Auto-Off

circuit. During periods of normal use, the power switch should
always be left on. It should only be turned off during extended
periods of nonoperation: e.g., when you are away on vacation.

Adjust Gain

Turn your subwoofer’s Level control 

up to the “5” position

(half way). If no sound emanates from the subwoofer, check the
AC-line cord and input cables. Are the connectors on the cables
making proper contact? Is the AC plug connected to a “live”
receptacle? Has the Power button 

been pressed to the “On”

position? Once you have confirmed that the subwoofer is active,
proceed by playing a CD, record or cassette. Use a selection that
has ample bass information.

Set the overall volume control of the preamplifier or stereo to a
comfortable level. Adjust the subwoofer’s Level control 

until

you obtain a pleasing blend of bass. Bass response should not
overpower the room but rather be adjusted so there is a
harmonious blend across the entire musical range. Many 
users have a tendency to set the subwoofer volume too loud,
adhering to the belief that a subwoofer is there to produce lots
of bass. This is not entirely true. A subwoofer is there to enhance
bass, extending the response of the entire system so the bass
can be felt as well as heard. However, overall balance must 
be maintained or the music will not sound natural. An
experienced listener will set the volume of the subwoofer so its
impact on bass response is always there but never obtrusive.

O

PERATION

Crossover Adjustments

Low-Pass Frequency Adjustment control 

– The Low-Pass

control determines the highest frequency at which the subwoofer
reproduces sounds. If your main speakers can comfortably
reproduce some low-frequency sounds, set this control to a
lower frequency setting, between 50Hz – 100Hz. This will
concentrate the subwoofer’s efforts on the ultradeep bass
sounds required by today’s films and music. If you are using
smaller bookshelf speakers that do not extend to the lower bass
frequencies, set the Low-Pass Frequency Adjustment control to a
higher setting, between 120Hz – 150Hz.

Note: This control will have no effect if the Direct Input is used.
If you have a Dolby Digital or DTS processor/receiver, the Low-
Pass Frequency is set by the processor/receiver. Consult your
owner’s manual to learn how to view or change this setting.

Phase Control

The Phase switch 

determines whether the subwoofer

speaker’s piston-like action moves in and out with the main
speakers, 0˚, or opposite the main speakers, 180˚. Proper phase
adjustment depends on several variables such as room size,
subwoofer placement and listener position. Adjust the phase
switch to maximize bass output at the listening position.