TRIO LS-5000
¥ 35,000 (1 unit, around 1975)
Commentary
A bookshelf speaker system that employs a passive radiator system.
The enclosure uses a passive radiator method, which uses the internal sound pressure changes caused by the woofer to drive the passive radiator, greatly improving the efficiency of the low frequency range.
The passive radiator of the LS 5000 is equipped with a 25 cm cone type passive radiator. In order to synchronize sound quality and vibration with the woofer, this unit uses the same cone paper and edge as the woofer to improve the low-frequency texture. In addition, a weight is used at the base of the cone paper to realize a low-frequency range with a high sound pressure level.
A 25 cm cone type woofer is installed in the low range.
This unit uses CF cone with bright sound developed in LS series, and NUKP (unbleached pulp) is blended to improve the sharpness of sound.
In addition, a double chamber system has been adopted. The chamber is bonded to the voice coil of the woofer and the chamber is attached to the cone paper. The small paper chamber directly connected to the voice coil extends the high range of the woofer sufficiently. In addition, the cloth chamber on the cone paper smoothly reduces the sound pressure that has extended to the high range and is connected to the tweeter.
An asymmetrical S-shaped edge is used for the edge part to allow the cone paper to move freely by allowing a large up and down amplitude. In addition, a large magnetic circuit is used for realize a low-pitched sound with damping and a high-and high-efficiency range.
A soft dome type tweeter with a voice coil diameter of 2.54 cm is installed in the high range.
The diaphragm of this unit is made of a Ganpishi that was selected after thorough research into soft dome materials. The Ganpishi has long fibers, excellent flexibility and strength, and achieves bright high-frequency playback. In addition, a doughnut-shaped micron glass wool is inserted between the equalizer and diaphragm, and the sound absorbing material in the center of the diaphragm is cut off to emphasize sound brightness.
In addition, by using a large magnet of the same class as LS 700, a high frequency with good articulation is realized.
A lumber core material is used for the front baffle with an emphasis on brightness in the middle and high range. This plate material uses muku material as a core material, and by sticking single plates on the front and back, it has a bright and nice sound.
In addition, an acoustic plate is placed obliquely between the woofer and the passive cone to prevent the occurrence of standing waves inside the enclosure and to achieve the best low-frequency characteristics.
Model Rating
| Method | 2-way, 2-speaker, passive radiator system ・ Bookshelf type |
| Unit | For low band : 25 cm cone type For High Range : Dome Type (Voice Coil Diameter 2.54 cm) Passive radiator : 25 cm cone type |
| Playback frequency band | 35 Hz to 20 kHz |
| Max Input | 60W |
| Impedance | 8 Ω |
| Output sound pressure level | 93dB/W/m |
| Crossover frequency | 4kHz |
| External dimensions | Width 320x Height 715x Depth 301 mm |
| Weight | 15.3kg |