KENWOOD LS-330
¥ 37,000 (1 unit, around 1984)
Commentary
A 3-way bookshelf speaker system that uses an ion-plated titanium dome tweeter.
A 21 cm cone type woofer is installed in the low range.
This unit is designed with high efficiency. The drive system uses a large ferrite magnet with a magnetic flux density of 9000 Gauss, a total magnetic flux density of 88000 Maxwell, and a diameter of 100 for the magnetic circuit magnet. The diaphragm uses a high-rigidity lightweight cone containing a special impregnation material with higher hardness in addition to a thermal shock treed cone. This combination realizes a Woofer unit with high efficiency and excellent transient characteristics.
A 7.5 cm semi-dome type skoker is mounted in the middle area.
We have developed a lightweight and high-rigidity diaphragm using aluminum dome with hardened surface made of oxide ceramic. It is a semi-dome type with features of dome type with excellent directivity and cone type with high efficiency.
A 2.5 cm ion-plated titanium dome type tweeter is installed in the high range.
For the diaphragm of this unit, we introduced ion plating (IP) technology for the first time in the world to realize a lightweight and highly rigid diaphragm. This ion plating technology ionizes titanium nitride, accelerates it in a plasma state, and deposits it on the surface of titanium. Since the kinetic energy of the molecules of titanium nitride is increased, the film is deposited, resulting in a diaphragm with high deposition strength and hardness more than six times that of titanium.
In addition, a high magnetic flux density is achieved by using a lightweight aluminum wire for the voice coil and a strontium ferrite magnet for the magnetic circuit.
In the network section, the printed circuit board is designed independently for the woofer, squaker, and tweeter, and is installed in three separate boards to reduce network crosstalk almost completely. The crosstalk from woofer to tweeter is -80dB, and from woofer to squaker is -100dB.
The enclosure has a unique connection structure for the connection between the baffle plate and the side plate, increasing the strength by approximately 40% compared to the simple hozo / mizo type connection.
We also take into consideration the hardness of the adhesive and use a special vinyl acetate resin adhesive that is harder than epoxy.
It uses a symmetrical design.
Model Rating
| Method | 3-Way, 3-Speaker, Bass reflex system, Bookshelf Type |
| Units Used | For low band : 21 cm cone type For Middle Area : 7.5 cm Semi-dome Type For high-pass : 2.5 cm dome type |
| Frequency characteristic | 35 Hz to 40 kHz |
| Instantaneous maximum input | 210W |
| Maximum allowable input | 170W(EIAJ) |
| Rated input | 110W |
| Impedance | 6 Ω |
| Output sound pressure level | 92dB/W/m |
| Crossover frequency | 900 Hz, 4.5 kHz |
| Maximum external dimensions | Width 280x Height 510x Depth 261 mm |
| Weight | 11kg |