CORAL BL-25D
¥ 73,800 (1 unit, around 1980)
Commentary
A 2-way backload horn speaker system with a newly designed horn tweeter added to the BETA-10.
The unit has a full-range unit, BETA-10
H-24 horn type tweeter is installed for high frequency band.
This H-24 uses 18 micron thick super duralumin for the diaphragm, and an edge-wise winding using high conductivity aluminum alloy ribbon wire for the voice coil to reduce weight.
Equipped with level control for the tweeter.
It is also possible to set it to the full range in which only BETA-10 operates by using the selector switch.
The enclosure is a backload horn enclosure designed for the BETA-10. Harmful harmonics are eliminated by the R. D. E. (Radiant Damping Effect) installed in the sound channel.
Model Rating
Method | 2-way, 2-speaker, CW back-load horn system ・ Floor type |
Units Used | For All Bands : 25 cm Cone Type (BETA-10) For High Range : Horn Type (H-24) |
Impedance | 8 Ω |
Program source input | 40W |
Crossover frequency | 6kHz |
Output sound pressure level | 101dB/W/m |
External dimensions | Width 450x Height 880x Depth 440 mm |
Weight | 36kg |
BETA-10 rating | |
Playback frequency band | 25 Hz to 20 kHz |
Lowest resonance frequency | 25 Hz to 40 Hz |
Output sound pressure level | 97dB |
Impedance | 8 Ω |
Effective mass of vibration system | 16g |
Qo | 0.5(35Hz) |
Magnetic flux density | 15,500gauss |
Rating of the H-24 | |
Playback frequency band | 4 kHz to 20 kHz |
Output sound pressure level | 110dB |
Program source input | 20W |
Magnetic flux density | 16,000gauss |