Acoustic Research AR-4x, 1965-1966, made in USA

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The speaker system which changed the model of a tweeter based on AR-4 which was put on the market in 1965 and called explosive popularity. 

A 6cm corn type unit is adopted as a 20cm corn type Woofer and a high region low-pass. 

The acoustic suspension system is adopted as the enclosure. 
This system was a system by Mr. Edgar Villchur's invention, and it was developed in order to remove the fault of the speaker till then with which harmonic distortion increases especially in low-pitched sound. 
By this system, the box without corn paper with high intensity, an air leak, and resonance by which full sealing was carried out is used, the parasitism vibration at the time of a low-pitched sound play is braked, and distortion is suppressed. 

Finishing of the exterior serves as oil finish of the walnut. 

 

System: 2 ways, 2 speaker acoustic suspension system, and a book shelf type

Use unit:

- woofer: 20cm corn type (AlNiCo)
- tweeter: 6cm dome shape
Frequency response: 45Hz - 20kHz
Impedance: 8ohms

Allowable input: Suitable for the amplifier beyond 15W

Crossover frequency: 1kHz

Dimensions (WxHxD):  255 x 482 x 225 mm

Weight: 7.5kg