For sale is a pair of Acoustic Research AR9 4-Way Speakers. They are a hard to find, audiophile set from the eighties and in excellent condition. All speakers are in tact and function as they should. If you Google them, you will see that there are many websites, devoted to this particular model. They are rated at the top of the hill, for the reproduction of music. You can audition them, before the sale is finalized. 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. The item “Acoustic Research AR9 4-Way Classic Vintage Speakers” is in sale since Sunday, December 1, 2019. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Speakers”. The seller is “mosey711s” and is located in Monkton, Maryland. This item can’t be shipped, the buyer must pick up the item.
- Model: AR9
- Country/Region of Manufacture: United States
- Custom Bundle: No
- Brand: Acoustic Research