DIATONE DIATONE F1
¥ 47,000 (1 unit, around 1977)
This is a bookshelf type speaker system using the newly developed bass reflex method.
A bass reflex system is used for the enclosure, and a newly developed underwater center duct is used for the bass reflex port.
In a 2-way system, there are two causes of cross modulation distortion : one is that the high sound emitted from the tweeter hits the diaphragm of the woofer and the high sound modulated by the vibration of the diaphragm is radiated, and the other is that the vibration of the woofer is transmitted through the baffle plate and causes the tweeter to swing by the vibration and cross modulation distortion is generated.
In order to reduce the cross modulation distortion caused by these causes, the extrinsic center duct adopted in F1 has a bass reflex duct installed between the woofer and the tweeter, and the opening of the duct protrudes from the baffle plate. This structure prevents the sound emitted from the tweeter from reaching the woofer by blocking the duct, and at the same time prevents the vibration transmitted from the woofer to the baffle plate from being transmitted to the tweeter, thus reducing the cross modulation distortion.
A 30 cm cone type woofer is installed in the low range.
The cone paper is equipped with an effective corrugation, material, molding method, and additives to prevent distortion due to split vibration. The sound quality is also improved by a powerful magnetic circuit and a die-cast frame weighing approximately 1.4 kg.
A 5 cm semi-dome type tweeter is installed in the high range.
A semi-dome type with a wide frequency range is adopted in order to reproduce the middle and high frequencies well. In addition, by increasing the voice coil diameter, generation of distortion is suppressed and transient is improved.
|Method||2-Way, 2-Speaker, Bass Reflex System, Bookshelf Type|
|Units Used||For low band : 30 cm cone type
For High Range : 5 cm Semi-dome Type
|Rated impedance||6 Ω|
|Playback frequency band||35 Hz to 20 kHz|
|Output sound pressure level||93dB/W (New JIS)|
|Level control||High Frequency : 3 positions (1.5 kHz to 20 kHz)|
|External dimensions||Width 370x Height 670x Depth 350 mm|