Classic 18 SRA Series Stereo Speakers. With Gold Plated Floor Isolation Spikes. Acoustic Research Classic SRA Stereo Speakers. The Acoustic Research Classic SRA Series is one of those super rare systems that few folks have ever seen, with even less being available on-line in the way of reference material! For those who are not aware, the Classic series was the last line of speakers Acoustic Research was still being produced in. 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, t. He 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. Nominal Impedance: 4 ohm. Drivers: 8 Poly Woofer, Two 5 ¼ Poly Midranges & 1 Soft Dome Tweeter. X Height 35 ½. Vintage Stereo Nut Guarantee. The item was tested and is being offered in proper working order. Please Note: The speakers are. Also listed to local San Francisco Bay Area. Craig’s List buyers. Driver License and cash. The item “Vintage Acoustic Research (AR) Classic 18 SRA Series Stereo Speakers Walnut” is in sale since Saturday, September 12, 2015. 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: Acoustic Research (AR)
- Model: Classic 18 SRA Series Stereo Speakers
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