Technics SB-E500

Commentary

This 4-way linear phase speaker system was completed by refining the know-how accumulated in the SB-10000.

A 38 cm cone type woofer is used for the low range.
The piston motion range is expanded by adopting a high-rigidity straight cone mainly composed of softwood pulp.
In addition, a high-hardness rubber ring is attached to the 75 mm large-diameter voice coil to brake the resonance of the voice coil itself, and the joint with the cone paper is also reinforced to suppress peaks that tend to occur in the high-frequency range.

A 25 cm cone type unit is used for the middle and low frequency band, which was developed considering the smooth connection with the horn type unit.
A high efficiency of 97dB/W/m is achieved by using a lightweight cone with a simple composition and an edgewise voice coil. In addition, the cone shape extends the playback high-range limit as a curved cone.

A tapered flare radial horn unit that opens at a wide opening angle of 150 ° is adopted for the middle and high range, and along with the tweeter, it realizes excellent directional characteristics as a horn speaker.
In addition, it is a cascade type in which a throat section with different cut-off frequency is provided between the high-precision 5-slit equalizer and the horn section to flatten the energy characteristics.
The driver section drives a 60 mm diameter, 30 μ m thick titanium diamond wheel with a magnetic circuit with a magnetic flux density of 19000 Gauss.
The voice coil uses CCAW for a high heat-resistant design.

A tapered flare radial horn that opens at a wide opening angle of 150 ° from the throat is used for the high range.
Shell type equalizers are used for equalizers that require high accuracy in the gap between the vibrating plate and the equalizer, and clear reproduction is achieved up to high frequencies beyond the range of audibility range.
The driver section is made of a 25mm-diameter aluminum dome coated with boron compound, and uses aluminum boride and negative ram to extend the playback high-frequency limit to outside of the 23 khz range of audibility range.

A linear phase network is used to control the phase characteristics of the speakers.

The enclosure has a large capacity of 170L and a solid structure using high-density perch boards.
In addition, the center of the enclosure is reinforced to minimize vibration modes by connecting the side plates, baffle plates, and back plates with plank.
It is finished with a rosewood oil finish, and uses a design that makes use of the aspect.

Model Rating

Method	4-way, 4-speaker, linear phase bass reflex system ・ Floor type
Units Used	For low band : 38 cm cone type For middle and low band : 25 cm cone type For Middle and High Area : Horn Type For High Frequency : Horn Type
Impedance	8 Ω
Output sound pressure level	93dB/W/m
Allowable input	150W(DIN RMS) 300W(MUSIC)
Crossover frequency	350 Hz, 1500 Hz, 8500 Hz
External dimensions	Width 720x Height 1030x Depth 560 mm
Weight	80 kg (With Net)