Audio Database

Image of CS-R70
Commentary

R Series 3-way speaker system.

A 30 cm cone type woofer is installed in the low range.
The diaphragm uses a special coated FB cone. In addition, the edge uses stable polyurethane foam that is less affected by changes in temperature and humidity, suppressing low-frequency distortion and edge resonance.
The voice coil adopts a long voice coil with copper ribbon wire wound edgewise on an aluminum bobbin with excellent heat radiation effect. This improves the air gap utilization rate and greatly improves efficiency and input resistance. In addition, the center pole equipped with a pure copper cap reduces non-linear strain and magnetic strain.
Large ferrite magnet of 140 φ is used for the magnetic circuit.

The mid-range is equipped with a horn type mid-range.
This unit is equivalent to the commercially available speaker unit PM-40. In order to avoid edge radiation which causes distortion, a sound path is provided in the diaphragm packing, and distortion is suppressed by the cancellation effect of anti-phase sound generated from the rear.
In addition, sound absorbing material is used in the yoke to improve sound quality. In particular, in order to achieve uniform directional characteristics and frequency characteristics, unique improvements have been made to the horn curve and fin structure, resulting in a thick structure of 4 mm. In addition, since it is a die-cast horn, the surface finish accuracy is high, and since there is little unevenness, the uniformity of characteristics is improved.

A multi-cellar horn type tweeter is installed in the high range.

In the Woofer network, an impedance compensation (CR) circuit is inserted in parallel with the unit to suppress the impedance change that rises toward the high frequency range.

The enclosure uses a bass reflex system, and a sound-absorbing partition in the center of the enclosure serves as a high-cut filter to enhance the bass reflex effect and prevent standing waves.

It comes with a brown grill. Also, there were blue and red grills as an option sold separately.

Model Rating
Method 3-Way, 3-Speaker, Bass reflex system, Bookshelf Type
Units Used For low band : 30 cm cone type
For Middle and High Area : Horn Type
For Super High Band : Horn Type
Impedance 8 Ω
Playback frequency band 35 Hz to 20 kHz
Output sound pressure level 91dB/W
Max Input 75W
Crossover frequency 700 Hz, 14 kHz
External dimensions Width 380x Height 660x Depth 346 mm
Weight 23kg
Sold Separately Replacement Grill Net PP-70BE (Blue, Pair, ¥ 2,500)
PP-70RD (Red, Pair, ¥ 2500)