Audio Database

The

JBL 250Ti
490,000yen(one-set, around the 1984 time)

Description
 
The large-sized floor type speaker system developed as a flag ship model which supplies the technology of Ti series and represents the thought and the technology of a JBL loudspeaker

It calculated to the wide band thoroughly to the location of coexistence of flat frequency characteristic and power response, the phase matching of each unit, the diffraction effect of an enclosure, and a backplane duct, and the form is determined as it.

LE14H-1 which is 38cmSFG Woofer by the Aqua positive compound cone is adopted as low-pass.

20cm cone type 118H developed for 250Ti is adopted as inside low-pass.

104H of a 13cm special polypropylene cone unit is carried in the mid-high range.
The special filler strip is raising the synthetic for polypropylene to the base sharply. And the same internal loss as polypropylene is maintained.

The 044Ti tweeter which used the pure titanium diaphragm is carried in the high region.
The original technology of spraying the fault style of high-voltage nitrogen gas has realized dome molding of 25-micron thickness, and the response which was excellent in the origami work of Japan combining the diamond edge pattern and reinforcement rib which obtained the Tips is gained.

The strapping busbar scheme with little tone-quality failure is adopted as an Attenuator.

The round baffle is used for an enclosure in consideration of the influence by the diffraction effect, and high-density particle board is used for the material. Moreover, surface finish is natural teak finish.
Furthermore, in order to prevent disorder of the response by reflection with a grill frame, the flooring grill using an original floating structure is adopted.


Rating of a mode
Scheme 3 ways, 3 loudspeaker bass-reflex scheme, and a floor type
Using unit For low-pass: 36cm cone type (LE14H-1)
For inside low-pass: 20cm cone type (108H)
For mid-high ranges: 13cm cone type (104H)
For high regions: Dome shape (044Ti)
Frequency characteristic 30Hz - -27kHz six dB
Allowable input (pink noise) 200W
Impedance 8ohms
Cross over frequency 400Hz, 1.4kHz, 5.2kHz
Output sound pressure level 90dB/W/m
Dimensions Width 572x height 1321x depth of 362mm
Weight 68kg