1 Tweeter, New-Old-Stock, Never Used. 1 Super-Tweeter, 4-ohm for. No 2 of 2. General Product Description of the Acoustic Research AR 1-inch Super Tweeter. The AR-3 (and the AR-3t, AR-3st, AR-2a and early models of the AR-2ax). Utilized a new phenolic-dome tweeter. And it was the first dome tweeter. Used in a commercially available loudspeaker. The AR-3 tweeter is probably the most recognized tweeters ever designed. With nearly perfect impulse response and superb off-axis response, it is still considered to be among the best-performing tweeters ever put in a loudspeaker. This tweeter design was first used in the famous AR-3 loudspeaker, introduced in October, 1958, and put into production in January 1959. This hard-dome tweeter was designed for the AR-3 by Edgar Villchur, and it was considered to be among the finest high-frequency transducers ever designed, both from the standpoint of its nearly ideal on-and off-axis frequency response and low distortion and coloration. Many experts and engineers considered this tweeter to be the equal of any electrostatic driver from the standpoint of transient behavior and linear, smooth response. 1-inch aluminum voice coil (this tweeter uses a free-form voice coil with no bobbin). Voice coil suspended in polyurethane-foam suspension. Voice coil sealed with butyl-latex coating around gap. Voice coil lead-out wires are aluminum. Top plate is -inch machined steel. Magnetic structure is 3.3 lbs Alnico-5 and Armco Iron. Mounting flange is specific to AR loudspeakers. Frequency response is ±1½ dB 7.5-20kHz. Sensitivity is approximately 86-87 dB. Tweeter used in AR-3, AR-3t, AR-3st, AR-2a and early models of the AR-2ax prior to 1969. 2 of 2 is a New-Old-Stock AR-3 super tweeter that has never been used or installed in a speaker, and it is in excellent condition, has good output, and it measures within the proper dc resistance range. This tweeter was part of the Delrama AR Export inventory that was in storage since 1969. Delrama exported AR products to Italy, Germany, England and other international locations for many years until AR added manufacturing locations in Holland and England. Overall Description covered by. Reproduction or copying of any of this material without the express permission of the writer is unlawful and prohibited. The item “Acoustic Research (AR) 1-inch Dome AR-3/AR-2a Super-Tweeter, NOS, 4ohm T-056″ is in sale since Wednesday, February 22, 2017. This item is in the category “Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Speakers”. The seller is “acoustic-research-inc” and is located in High Point, North Carolina. This item can be shipped worldwide.
- Brand: Acoustic Research
- MPN: ST-0375
- Model: AR-3 Super-Tweeter
- Country/Region of Manufacture: United States
- Tweeter Type: 1-3/8-inch phenolic dome
- Type Voice Coil & Former: Aluminum Free-Form Voice Coil
- Tweeter Magnet Assembly: 3.3 lbs. Alnico-Five & Armco Iron
- Anechoic On-Axis Freq. Resp: ±1½ dB 7.5-20kHz
- Impedance: 4-ohm