Audio Database
Commentary

A compact speaker system developed as the first of the Infinitesimal Series.
The naming derives from the compact speakers インフィニテシマル I, II and III which appeared in 1979.

A 10.8 cm cone type woofer is installed in the low range.
The IMG (Injection Molded Graphite) cone made of graphite reinforced polypropylene, which has a reputation as an original technology of Infiniti, is equipped with a voice coil of φ 2.5 cm diameter and a magnetic circuit with anti-vibration measures to achieve low-sound reproduction exceeding the size.

A newly developed EMIT-R tweeter is installed in the high frequency range.
This unit inherits Infiniti's proprietary EMIT Tweeter technology. By driving a 3 cm diameter flat diaphragm with a strong magnetic field, it enables superior transient performance, low distortion, and wide-band reproduction.
The flat diaphragm of EMIT-R consists of a very thin KAPTON film surface and a circular voice coil photo-etched on it. The diaphragm is directly driven by a magnetic circuit composed of strong ferrite magnets (70 φ x10) and anti-magnetic magnets.

To eliminate topological contamination, phase alignment of the bass and treble units is achieved through the use of stepped baffles, and faithful time alignment is achieved through the design of a dense crossover network.

The network section uses carefully selected materials such as special polypropylene and condenser.
In addition, a protection circuit is mounted to cope with an excessive abnormal input signal.

ABS synthetic resin material is used for the enclosure to suppress unwanted resonance, and rubber damping material is used for the lower part and the outer circumference of the grill.
There is also a wall mounting bracket on the back.

There was a special bracket as an option sold separately.
In combination with a separately sold インフィニテシマル IV sub-woofer, 40 Hz ultra-low frequency playback is possible.

Model Rating
Method 2-Way, 2-Speaker, Bass Reflex System, Bookshelf Type
Units Used For low band : 10.8 cm cone type
For High Frequency : Flat Type (EMIT-R)
Frequency characteristic 100 Hz to 40 kHz ± 2 dB
Input impedance 6 Ω
Output sound pressure level 90dB/1W/1m
Allowable input 80W
Crossover frequency 5kHz
External dimensions Width 152x Height 238x Depth 175 mm
Weight 2.4kg
Sold Separately Subwoofer Infinitesimal-IV Sub woofer (1 unit, ¥ 140,000)
Sold separately : Wall Bracket (pair, ¥ 16,000)
Features Wall surface and hanging type (arm length : about 11.5 cm)
Weight 330g