DIATONE AS-4021
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Commentary
This large-size audio monitor system incorporates an all-transistor amplifier into a 3-way high-fidelity speaker that combines a newly developed 12 cm mid-range speaker with a 40 cm low-sound speaker.
Similar to AS-4001, it was completed in 1966 (1966) in technical cooperation with NHK Technical Research Institute.
Each unit is fully adjusted in an anechoic room.
Since it was developed for stereo, it has a symmetrical unit arrangement.
It is designed to be used as a large trial listening room, recording monitor speakers for music, and audition speakers.
The input code is based on 21P3B of BTS-4101.
Model Rating
| Method | 3-Way, 5-Speaker, Bass Reflex System, Floor Type |
| Configuration such as unit | For low band : 40 cm cone type (PW-4011B) x1 For Medium Range : 12 cm Cone Type (PM-1201) x2 For High Range : 5 cm Cone Type (TW-25S) x2 Network : 1 x NT - 3402 Amplifier : One MA-402 all-transistor type amplifier Caster : MC-1470 Type |
| Playback frequency band | 40 Hz to 15000 Hz ± 5 dB |
| Input level | -22dBm |
| Input impedance | 600 Ω, 10k Ω (Balanced) |
| Crossover frequency | 300 Hz, 3000 Hz |
| Maximum output sound pressure level | 111dB/m |
| Undistorted maximum output sound pressure level | 109dB/m |
| Pwer | 100 VAC, 110 VA |
| External dimensions | Body Only : Width 850x Height 1278x Depth 520 mm With Casters : Width 1113x Height 1428x Depth 520 mm |
| Weight | 160kg |