NIKKA CS-W55

Commentary

A floor-type speaker system that uses a National-Made Unit.

The speaker unit uses the EAS-20PW55, a 20 cm double-cone unit consisting of a main cone for low-frequency playback and a high-tone cone for high-frequency playback.
This unit uses the UL edge newly developed by National. Since the UL edge is a special plastic edge that can increase compliance, strain is reduced without requiring conventional special processing.
Since the voice coil is made of high-purity aluminum wire and is much lighter than copper wire, we have succeeded in extending the high-frequency reproduction limit.

Since the sound waves emitted from each part of the speaker cone have a phase difference between them, interference occurs at a certain wavelength, especially in the high-frequency range, causing fluctuation in frequency characteristics.
In order to cope with this problem, a patented equalizer ball (low-phase equalizer) is installed in front of the high-tone cone to flatten the high-tone characteristics by aligning the surface using the diffraction of sound waves.

Uses a magnetic circuit with air gap magnetic flux density of 12,200 Gauss.

The enclosure is a bass reflex type using the walnut developed for the EAS-20PW55.
The interior is covered with a glass wool sound-absorbing material, and the exterior has a matte color and decoration.
It is designed to be installed with the back side along a hard wall.

Model Rating

Method	1-Way, 1-Speaker, Bass Reflex System, Floor Type
Units Used	For All Bands : 20 cm Double Cone Type (EAS-20PW55)
Impedance	8 Ω
Frequency characteristic	35 Hz to 20000 Hz
Nominal input	10W
Music power	20W
External dimensions	Width 380x Height 720x Depth 300 mm
Weight	13kg