70s year Legend Pair Maxonic field coil D511EX driver and HS501 horn. Original power supply EX-6 is included.

It was manufactured in 70s year and become one of Japanese honor, this

is the best horn driver that has sound is very close to Western

Electric, very very rare item and high reputation from audiophile. It is

field coil driver, which use 7V power supply. Power supply is original EX-6.

Specification:

The finest excitation type screwdriver designed for professional use such as theaters and large halls.

Each one is carefully made under strict quality standards.

A high-end excitation type driver designed for professional use such as theaters and large halls.

Each unit is carefully made under strict quality standards.

An excitation type is adopted for this driver unit.

In general speaker units, it is ideal for the diaphragm to move in the same direction as the input signal current. Also, the movement does not stop due to inertia, and the sound is different from the original sound.

In order to remove this shortcoming, in the excitation type unit, a particularly strong magnetic field is created to speed up the start, and the voice coil generates strong back electromotive force to apply complete self-braking (electric brake).

The D51EX uses silicon steel with a magnetic resistance that is several thousandths of that of a ferrite magnet to create a strong magnetic force and generate a back electromotive force so that complete self-braking is applied.
Frequency characteristics 500Hz-18kHz

Output sound pressure level 108dB / m
Maximum allowable input 30W

Impedance 8Ω
Optimal crossover 500Hz or higher

Magnetic flux density 18,000 gauss
Excitation voltage 8V

Throat diameter 25mm
External dimensions Diameter 150φ x Depth 120mm

Weight 9kg
Sold separately: Excitation power supply for D51EX EX8-3 (¥ 8,000)

DC output voltage 6, 7, 8, 9V
Power supply voltage AC100V, 50Hz / 60Hz

External dimensions Width 120 x Height 90 x Depth 180 mm