JBL 4312SX 115,000yen(one-set, around the 2000 time)

The speaker system which expanded a power range of crown compass by leaps and bounds, and aimed at the correspondence to DVD-Audio, SACD, etc.

2213H which is a 30cm white cone type Woofer is adopted as low-pass.
The copper ribbon edgewise volume voice coil of the diameter of 75mm is used, and the SFG (symmetrical field geometry) magnetic circuit and the aluminum die-casting frame are adopted.
Moreover, the Aqua positive coating pulp cone is adopted as a diaphragm, and the accordion-pleats edge is used for an edge.

904Ti-1 of a 12.5cm pure titanium inverted dome mid range is adopted as a mid range.
In order to expand a waveguide-plunger motion area, while molding a diaphragm in the shape of a reverse dome shape, in order to suppress an occurrence of a splitting oscillation, the 37mm voice coil of a balance drive design is adopted.
The neodymium magnet is adopted as a magnetic circuit and the Tran Gent property and resolution are conjointly raised with the bucket structure by an aluminum die-casting frame, and the Ben Ted center pole piece which misses a back-pressure.

TW025Ti which is a 25mm replace pure titanium dome tweeter is carried in the high region.
a profit -- the lightweight aluminum voice coil which gave the Kopper coating to the pure titanium diaphragm of press molding is adopted.
Furthermore, "fellow fluid dumping" which heightens the vibration suppression effect is adopted at the same time it misses the heat of a diaphragm.

The succession variable Attenuator volume of a mid range / high region independency is equipped so that it can respond to usage various as a bookshelf type.

The enclosure has adopted the twin port type of a bass-reflex structure.
Moreover, while raising a baffle intensity by using 25mm thickness MDF material for a front baffle, the phase and diffraction of an inter-unit are controlled by forming a mid-high-range unit into flush mounting.
The sheath serves as walnut finish. 

Scheme	3 ways, 3 loudspeaker bass-reflex scheme, and a bookshelf type
Unit etc.	For low-pass: 30cm cone type (2213H) For mid ranges: 12.5cm reverse dome shape (904Ti-1) For high regions: 2.5cm dome shape (TW025Ti)
Frequency characteristic	40Hz-50000Hz±0dB
Output sound pressure level	93dB(2.83V/1m)
Impedance	6ohms
Allowable input	150W(RMS)
Cross over frequency	900Hz, 3800Hz
Dimensions	Width 362x height 597x depth of 299mm
Weight	20.0kg
Option	Loudspeaker table lamp JS-50 (one set, 25,000yen)

Posted in: JBL, JBL-Speaker, JBL-Speaker-Professional