Infinity SM Series User Manual

UNPACKING
Check your speaker carefully. If it has been damaged in transit, call your
dealer and/or the trucking firm that delivered it.
ASSOCIATED COMPONENTS
The choice of associated components in your system is critical and should
be made with great care. Here are several suggestions.
Employ a high powered amplifier. Higher power results not only in cleaner,
more open sound but it insures that the speaker will not be harmed by an
overdriven amplifier.
Never operate your system with the bass, treble and loudness controls set
to full boost. This always places undue strain on the speaker and amplifier.
The volume control settings are not a specific indication of the loudness level
of the speakers. The only important consideration is the loudness level at which
the system can be played regardless of where the volume control is set.
Always turn down the volume control when changing a record, or switching
inputs to AM, or FM operation. Excessively loud transients (clicks or popping
sounds) can damage the speakers.
Whenever changing wires, pulling plugs, etc., always turn off all equipment
to prevent transients from entering the speakers. It is always worthwhile to
discuss proper speaker connection and component selection with your dealer
prior to setting up your system.
POSITIONING
Room acoustics vary widely and even small changes in position will affect
the sound. To obtain the best results, it is worthwhile experimenting with
different room positions for your speakers and listening to the results.
For the best stereo image, the speakers should be no less than 2 to
3 meters (7 to 10 feet) apart.
If your roorn is larger than average, a wider placement of the speakers may
be desirable: about 4 meters (12-15 feet). Angle the speakers slightly inward
toward your listening position in the room.
The proximity of your speakers to the corners and walls can affect tonal
balance in the bass and lower middle frequencies.
By choice or necessity, you may be placing your SM82 loudspeakers on a
shelf directly against the wall. However, this is not optimum as you will sacrifice
the depth of image that is characteristic of INFINITY speakers.
If you must mount the speakers higher than ear level, place a shim under
the rear of the cabinets to angle the front plane of the speaker slightly
downward.
If the speakers are mounted near the floor, a shim should be used to tilt
the frontal plane of the speakers backwards, with the sound directed slightly
upward.
In most homes, carpets, drapes and furniture generally balance window
areas and walls, producing a relatively optimal acoustic environment.
Where extremes exist (heavy draperies, heavily carpeted floors, heavily
padded furniture) overall sonic balance may be excessively dull, or dead. Wide
expanses of glass, mirrored walls, glass doors, or hard surfaces on furniture
may create a hard, bright sound. On some models, compensation for room
acoustics can be made with the midrange and tweeter controls on your
speaker, or by using the tone controls on your receiver or integrated amplifier.
CONNECTING THE SYSTEM
Make sure the amplifiers are switched off before making any connec-
tions. Connect your amplifiers to the speakers using 16 gauge (or heavier)
two-conductor wire with polarity coding. It is important that the speakers be
connected “in phase”.
Use polarity coding to make sure that the “+” (red) terminal of each speaker
is connected to its amplifier's “+” output.
CORRECT:
Correct (“in-phase”) connection.
Plus (red) goes to plus.
Minus (black) goes to minus.
INCORRECT:
GZ A
Incorrect (“out-of-phase”) connection:
Plus-to-minus, minus-to-plus. Results in distorted, “out-of-
phase" sound.
Before switching on, check carefully to make sure that no stray or frayed
strands of wire are touching both the “+” and “—" terminals at either the speaker
or the amplifier connections, as this will cause a short.
STANDS
Your speakers will perform best in a vertical position, with the bottom of
the cabinets 6” to 24” above the floor. If you use a 6” stand, choose one that
angles the speaker slightly backwards so that the front plane of each speaker
is directed upward toward your usual listening location. A 12” stand requires
less tilt to accomplish the same effect. At 18” to 24” above the floor, the speaker
can be mounted parallel to the floor for optimum dispersion.
SETTING THE CONTROLS ON THE PASSIVE CROSSOVER
The SM112 employs a tweeter level control, and the SM122 and SM152
employ level controls for the midrange and tweeter. These controls, located
on the front of the speaker to the right of the midrange/tweeter, must be set to
match room acoustics by listening to various types of program material.
Generally, once set, the controls will remain at the chosen settings until the
speakers are relocated.
A WORD ABOUT TONE CONTROLS
The tone controls on your electronic components (pre-amp, receiver, etc.)
should be used with the utmost discretion. Excessive boost can create severe
power demands on your power amplifier. Maximum bass boost can create a
demand for literally hundreds of undistorted watts in the bass region, whereas,
in the “flat” position, or with the tone controls switched out of the system, your
average listening level may be impressively and realistically loud at less than
10 watts. The remaining power capacity required is on reserve for power peaks
on sharp transients and powerful crescendos.

Infinity SM Series Specifications

General

Series	SM Series
Impedance	8 Ohms
Sensitivity	90dB
Woofer Size	6.5 inches
Tweeter Size	1 inch
Weight	15 lbs