JBL UT-405
¥ 150,000 (a set of two cars, around 2001)
Commentary
The Super Tweeter system was developed from the UHF driver unit of JBL studio monitor.
The UT 405 uses a ring radiator system that is used as a UHF (ultra high frequency) driver for the 4344 mkII and 4344M.
Uses a 2.5 cm tempered titanium diaphragm for the diaphragm.
This diaphragm is made of pure titanium and treated by high heat quenching with nitrogen gas to increase its hardness. Its regenerative capacity in the high-temperature range is expanded to over 70 kHz.
It has a built-in high-pass filter that can be connected directly to the amplifier in parallel with the main speaker.
The circuit uses JBL's unique charge-coupled linear definition network circuit. By applying DC-bias to the capacitor, crossover distortion is eliminated, and ultra-high frequency reproduction with less turbidity is achieved.
Equipped with a crossover frequency selector switch that can select three frequencies. The filter circuit uses a -18dB/oct type with a steep slope.
In addition, it is equipped with an output sound pressure level selection switch that can be set in three levels of 0dB/-2dB/-4dB, so that the level can be adjusted with the main speaker.
A large gold-plated binding post type terminal is used for the input terminal, and a banana plug or speaker cable with Y-type connector can be used.
The 33 mm thick MDF material is used for the front baffle to firmly support the unit.
The exterior has a high-gloss black finish on the front and a natural wood black ash finish on the cabinet.
Cone type 3-point pinpoint spike is included and vibration from the ground plane can be eliminated.
It also comes with a spike receiver to protect the top plate of the main speaker from scratches.
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Model Rating
| Method | 1-way, 1-speaker |
| Units Used | For Super High Band : 2.5 cm Ring Type |
| Frequency characteristic | Fc ~ 70 kHz |
| Impedance | 8 Ω |
| Allowable input | 50W(RMS) |
| Output sound pressure level | 95dB/2.83V/m (at 0 dB position) |
| Cutoff frequency | 16kHz/20kHz/24kHz, Switching Type |
| External dimensions | Width 190x Height 122x Depth 172 mm |
| Weight | 2.1kg |
| Attachment | Spike Spike receiver |
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