One Pair Acoustic Research AR4x 8 Ohm Speakers Acoustic Suspension Loudspeakers. Serial numbers: FX320598 and FX310393. 2-Way 2-Speaker Acoustic Suspension System. Frequency Response: 45Hz – 20kHz. Recommended Amplifier: 15 Watts minimum. Bass: 1 x 8 cone. Tweeter: 1 x 2.5 wide dispersion cone. Finish: Oiled Walnut, Birch, Pine. Dimensions: 19-1/8″ (H) x 10-1/8″ (W) x 9-1/8 (D) (Each). Tested in our shop, in good working condition. One of the speakers has a ring-shaped watermark on top (see photos). Surfaces have scratches, stains, marks, oxidation, discoloration, and wear from age and normal use (see photos). East Hartford, CT 06108. The item “One Pair Acoustic Research AR4x 8 Ohm Speakers Acoustic Suspension Loudspeakers” is in sale since Monday, September 21, 2020. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Speakers”. The seller is “gordon_lasalle_music” and is located in Southbridge, Massachusetts. This item can be shipped worldwide.