Pioneer of Pioneer CS-E900 specifications

Pioneer CS-E900
¥ 55,000 (1 unit, around 1973)
¥ 58,000 (1 unit, around 1974)

Commentary

A 3-way speaker system with a 90 ° rotating tweeter.

A 30 cm cone type woofer is installed in the low range.
A FB cone and an aluminum voice coil are used in the vibration system of this unit, and a magnetic circuit using a large ferrite magnet and a large diameter long voice coil improves input resistance and reduces distortion.
The unit tongue of this woofer realizes fo19Hz, and it is combined with an enclosure filled with sufficient sound-absorbing material to improve the bass reproduction capability.

The mid-range has a 12 cm cone type mid-range.
This unit uses a FB cone for the diaphragm and is molded in a deep shape to ensure strength. Combined with the magnetic circuit using a large ferrite magnet, this unit realizes excellent transient characteristics and low distortion rate. Also, the directional characteristics are improved by the effect of the cone center dome.
The mid-range unit has a large cap on the back to prevent back pressure from the woofer.

A multi-cellar horn type tweeter is installed in the high range.
The combination of a 25 mm φ diaphragm made by molding 30 μ m ultra-hard duralumin into a dome shape and an aluminum die-cast multi-seller horn enables playback up to 28 kHz.
This unit has a unique rotating structure that allows the horn angle to be changed by 90 °, so that the directional characteristics do not change when the speaker is installed vertically or horizontally. It is also installed on the baffle plate in a unique way that eliminates interference distortion.

The network section employs a coil wound around a large ferrite core with low degradation and loss and good transient characteristics.
It also has level controls for mid-range and high-range signals.

The enclosure is hermetically sealed.

In addition to the normal with a multi-amplifier terminal in addition to the normal terminal. 2-way or 3-way multi-amplifier playback is possible by switching the switch.