Classic 18 SRA Stereo Speakers. Gold Plated Floor Isolation Spikes. They are a rare find today because they stopped production almost as soon as it started! For those who are not aware, the Classic series was the last line of speakers Acoustic Research was still being produced in Canton , Massachusetts. Acoustic Research Classic 18 Technical Overview. Classic SRA Series speakers systems are all build around one of AR’s core technology modules, called the Symmetrical Radiation Array (SRA). The SRA consists of one 1 Soft-dome Tweeter, two Poly Midranges Drivers and the Poly Bass Driver. Apart from the bass driver size, the SRA is identical in all Classic systems, from the 18 to the 30. What the designers were seeking was controlled, uniform dispersion within a moderately wide listening window. This topology creates a virtual point source; all sound appears to emanate from one point or acoustic center. The enclosures that house all this technology are designed to be as inert as possible. Trapezoidal in footprint, and with a sloping top, the cabinets are heavily braced internally and are finished in high quality real wood veneers. The trapezoidal shape helps to reduce standing waves within the enclosure and provide increased rigidity. The front panel is as slim as possible for any given drive unit size and is heavily reinforced. This is to reduce early reflections in the mid to high frequency domain. All Classic SRA models are equipped with removable spikes and removable protective grills. These speakers are in very nice condition excepting a minor repair on one bass rubber dust cap, the cabinets are walnut and all corners are sharp. There are no significant scratches, dings, water stains, veneer damage or blemishes…… Complete with grills and gold plated floor isolation spikes. Spikes are adjustable for leveling, sit on gold plated discs or may be removed for use on stands or the floor. Includes the Original 14 page Owner’s Reference Manual. With Owner’s Registration Card. Plus a color copy of the Early 1992 AR Brochure & Specification for Classic Model 5, 6, 8 and Classis SRA Series Model 12, 18, 26, 30 & 36. You will notice that there are models discrepancy between the Owner’s Reference Manual and the Later AR Brochure found on-line. And concludes this some models never made it to production like the Classic 36! Nominal Impedance: 4 ohm. Frequency Reponse: 40Hz-20kHZ (+/-3dB). Drivers: 8 Poly Woofer, Two 5 ¼ Poly Midranges & 1 Soft Dome Tweeter. Dimensions: Wide 9 13/16 x Deep 12 5/16 x Height 35 ½. Vintage Stereo Nut Guarantee: The item was tested and is being offered in proper working order. The speakers are also listed to local. San Francisco Bay Area. Buyers; I reserve the right to cancel this ad. Please Note: You must present a driver license and your signature will be required. The item “Vintage Acoustic Research Classic 18 SRA Series Walnut Stereo Speakers with Spikes” is in sale since Thursday, November 17, 2016. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Speakers”. The seller is “vintage-stereo-nut” and is located in Ben Lomond, California. This item can’t be shipped, the buyer must pick up the item.
- Brand: Vintage Acoustic Research
- Model: Classic 18 SRA Series