TRIO LS-303
¥ 53,000 (1 unit, around 1977)
Commentary
A speaker system developed based on the linear response concept.
A 33 cm cone woofer is installed in the low range.
A 65 φ voice coil and ferrite magnet are used for the magnetic circuit, and an asymmetric S-shaped edge is used for the edge supporting the cone paper which is less likely to generate harmonic distortion even at large amplitude.
The voice coil bobbin is made of aluminum, and the voice coil is fixed with heat-resistant adhesive to improve input resistance.
Aluminum die-cast is used for the frame.
Equipped with 12 cm cone type skoker in the middle area.
The cone shape uses an exclusive curved cone with excellent low-frequency characteristics.
A 4.5 cm cone type tweeter is installed in the high range.
In order to increase efficiency with a small diameter, we adopted a method of supporting cone paper with only a damping material, and reduced the mass of the edge to improve the transient response characteristics.
Newly developed acoustic homogen material is used for the enclosure.
Model Rating
| Method | 3-Way, 3-Speaker, Bass reflex system, Bookshelf Type | ||
| Unit | For low band : 33 cm cone type For Medium Range : 12 cm cone type For high pass : 4.5 cm cone type |
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| Frequency characteristic | 30 Hz to 18 kHz | ||
| Max Input | 90W | ||
| Rated input | 60W | ||
| Impedance | 8 Ω | ||
| Output sound pressure level | 92dB/W/m | ||
| Crossover frequency | 1.3 kHz, 5 kHz | ||
| Acoustic Level Control | Mid-range : ± 2 dB, 3 steps High frequency : ± 2 dB, 3 steps |
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| External dimensions | Width 380x Height 653x Depth 331 mm | ||
| Weight | 24kg | ||
| Sold Separately | Speaker Stand SR-2000S (2 pcs 1 set, ¥ 12,000) | ||
| Unit Characteristics | |||
| Type | Woofer | midrange | Tweeter |
| Type | 33 cm cone type | 12 cm cone mold | 4.5 cm cone type |
| Playback band | Fo ~ 2.7 kHz | 400 Hz to 10 kHz | 2 kHz to 18 kHz |
| Output sound pressure level | 92dB/W/m | 94dB/W/m | - |
| Impedance | 8 Ω | 8 Ω | 8 Ω |
| Magnetic flux density | 9,600gauss | 11,000gauss | 13,000gauss |
| Total flux | 157,000maxwell | 40,000maxwell | 16,700maxwell |