YAMAHA JA-4272

Commentary

Horn type tweeter with beryllium ring diaphragm.

It consists of a 200 mg lightweight V-shaped ring diaphragm of 50 mm outer diameter and 30 mm inner diameter made of high-purity beryllium with a thickness of 50 microns, and a short-cut, low-cutoff exponential spherical horn that takes sound quality and directional characteristics into consideration.

An internal magnetic circuit with an Alnico magnet is used for the magnetic circuit.

Model Rating

Type	Horn type tweeter unit
Nominal impedance	8 Ω
Playback frequency band	4 kHz to 20 kHz
Recommended bandwidth	7 kHz or more
Rated input	10W
Max Input	20W
Output sound pressure level	105dB/W · m
Diaphragm	V-shaped beryllium ring
Voice coil diameter	42.6 φ mm
Equalizer, horn	Aluminum Milling
Magnet	Alnico, 0.33 kg
Magnetic flux density	18,500gauss
Total flux	74,300maxwell
External dimensions	Diameter 104 mm x Height 90.5 mm
Weight	3.3kg
Sold Separately	Mount Ring M-4272B (¥ 8,700) Stand M-0572S (¥ 8,000)