Plus One Woofer Cones: The Plus One speaker cones offer
more surface area than other speakers that fit in the same size opening. This
is accomplished by using a new basket design and hi-roll surround. The result
is greater bass output and an increase in efficiency.
Mounting: Infinity markets these speakers as 6-1/2"; the
will fit in standard 6-1/2" speaker openings (approximately 5" diameter),
but they do not use the standard 6-1/2" speaker bolt pattern. In order to
install them in standard 6-1/2" applications you must drill new screw holes.
The woofers are easily installed in many standard 4-hole 6-3/4" applications
with no modification.
Tweeter Mounting: The I-Mount tweeter mounting system and
Starfish mounting brackets give you several different ways to mount the tweeters:
- I-Mount Mounting System: The
tweeters can be surface or flush mounted:
- Surface Mount: Surface mounting
the tweeters involves screwing the surface-mount cup
to the mounting location, then inserting and locking
the tweeter into the cup.
- Flush Mount: Flush mounting is
made easy through the use of the threaded flush-mount
housing and plastic locking nut. Once a cutout is made,
the tweeter is installed in the flush-mount adapter,
then into the flush mount housing and inserted into
the hole. The large plastic locking nut is threaded
onto the adapter (from behind the mounting surface)
to hold the complete assembly securely in place. When
flush mounted, the tweeters may be angled for optimum
response and imaging.
- Starfish Mounting Brackets: The Starfish
mounting brackets allow the tweeters to be installed in factory
locations behind the grilles:
- Bottom Mount: Once the Starfish
bracket is trimmed, it is secured to the underside of
the grille panel. The tweeter must be inserted into
the bracket and locked into place before the bracket
- Surface Mount: Once the Starfish
bracket is trimmed, it is screwed to the top of the
mounting surface behind the grille panel. Then, the
tweeter is inserted into the bracket and locked into
- Flush Mount: There are two sets
of tabs to flush mount the tweeter in the Starfish
bracket, yielding different mounting dimensions. The
upper tabs mount the tweeter completely below the
opening and are glued in place. The lower mounting
tabs are screwed in place and result in a mounting
height just under a half inch. Once the bracket is
mounted, the tweeter is inserted into the bracket
and locked into place.
I-Mount Surface Mount ||
I-Mount Flush Mount ||Starfish Bottom Mount ||Starfish Surface Mount ||Starfish Flush Mount ||Starfish Flush Mount (below mounting surface) |
Height ||0.883" ||0.67" ||0.0" ||0.873" ||0.406" ||0.0" |
Depth ||0.5" (screw
depth) ||0.77" ||1.011" ||0.5" (screw
depth) ||0.534" ||0.94" |
Diameter ||1.482" ||1.84" ||3.012" ||2.444" ||2.316" ||3.012" |
Cutout Diameter ||N/A ||1.58" ||N/A ||N/A ||1.508" ||2.6" |
Crossovers: The 1st order 2-way crossovers' inputs and outputs
are screw terminals; they will accommodate bare wire or spade connectors up to
0.3" wide. There are four mounting holes in each crossover.
- Width: 2.165"
- Height: 0.97"
- Depth: 2.207"
3-ohm Voice Coil: The Primus Series speakers feature 3-ohm
voice coils to compensate for the high in-line resistance of small gauge factory
wiring and extract every watt from the factory receiver, increasing overall system
output and efficiency (relative to 4-ohm speakers). The speakers also benefit from
increased power when you upgrade the wire and add aftermarket amplifiers capable
of powering a 2-ohm load.
Power Handling: Although Infinity lists the continuous average
RMS power handling as 80 watts, they also list the recommended power range as 5-200
watts RMS. We've opted to list the more conservative 80 watt RMS figure on the
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