They have always been very well cared-for and have always lived in a smoke-free home. Each speaker contains adjustable tweeter, midrange, 8″ midbass and two 10″ woofers. All 4 woofers and 2 midbass were newly refoam. Newly foam have been installed the correct way with no voice coil rub. And sound quite amazing as a result. All grills are in very good condition and easily pop off and on. Please see pictures for cosmetic condition. In the Acoustic Research AR-9, for the first time we have a system that is virtually flat down to 28Hz, comes in with a more than acceptably low Q of 5, and reproduces bass frequencies with startling power and clarity. How have AR engineers managed to bend the laws of physics? First, the AR9 uses two 300mm (12 inch) woofers connected in parallel. At any volume setting each of them moves only half the distance a single driver would have to move to produce the same volume level. Thus the woofers are able to handle more power without distortion or break-up. Second, a large enclosure (120 litres) is used to create a system with a low resonant frequency. Third, and the real secret weapon, is a sophisticated new crossover network – an important step ahead in speaker design. This crossover is designed with special circuitry that acts like an automatic transmission and helps control bass response. It allows the system to have maximum damping at the resonant frequency (thus low Q) while maintaining bass output. Above the resonant frequency it shifts electronically to maintain flat response across the bass spectrum. Type: 4 way, 5 driver loudspeaker system. Frequency Response: 18Hz to 30kHz. Recommended Amplifier: 400W (maximum). Crossover Frequency: 200, 1200, 7000Hz. Bass: 2 x 300mm acoustic suspension. Midbass: 1 x 200mm acoustic suspension. Midrange: 1 x 38mm dome. Tweeter: 1 x 19mm dome. Dimensions: 1340 x 381 x 402mm. Weight: 130 lbs each. The item “Acoustic Research AR-9 4-Way Floor-Standing Loudspeaker System (1979) One Owner” is in sale since Sunday, July 31, 2016. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Speakers”. The seller is “2015cellphoneguy” and is located in Baton Rouge, Louisiana. This item can’t be shipped, the buyer must pick up the item.
- Brand: Teledyne Acoustic Research
- Model: AR9
- Country/Region of Manufacture: United States
- Country of Manufacture: United States