Guest Posted January 2, 2003 Report Share Posted January 2, 2003 Can someone tell me the frequencey response for each of the ar3 drivers?Or where the woofer dpops off and the mid picks up?woofer range-Mid range-Tweet range-I dont know how to read the drawings on the schmatic pageThanksBrian O Link to comment Share on other sites More sharing options...
charger3834 Posted January 2, 2003 Report Share Posted January 2, 2003 I think I can field this one.In the AR-3 speaker system, the crossover points are as follows: The woofer responds from about 30 HZ to 1000 Hz. The 2" mid range dome takes over at 1000 Hz. The 1 3/8" tweeter takes over at 7500 HZ and continues to respond beyond 20000 HZ. The AR-3 is without a doubt, a full range loudspeaker.As for the response curves of each driver tested alone, refer to AR's technical data sheets. You can download an AR-3 brochure from this site that contains technical data. Link to comment Share on other sites More sharing options...
Guest Posted January 2, 2003 Report Share Posted January 2, 2003 >I think I can field this one. >>In the AR-3 speaker system, the crossover points are as >follows: The woofer responds from about 30 HZ to 1000 Hz. >The 2" mid range dome takes over at 1000 Hz. The 1 3/8" >tweeter takes over at 7500 HZ and continues to respond >beyond 20000 HZ. The AR-3 is without a doubt, a full range >loudspeaker. >>As for the response curves of each driver tested alone, >refer to AR's technical data sheets. You can download an >AR-3 brochure from this site that contains technical data. Thankyou BradBrian O Link to comment Share on other sites More sharing options...
tysontom Posted January 22, 2003 Report Share Posted January 22, 2003 >Can someone tell me the frequencey response for each of the >ar3 drivers? >Or where the woofer dpops off and the mid picks up? >woofer range- >Mid range- >Tweet range- >I dont know how to read the drawings on the schmatic page >Thanks >Brian O I tried to weigh-in on this message when it came out, but was unable to succeed because of this forum's earlier problems. All is well now, I hope.The AR-3: I love this speaker. I think it is the highest single technical achievement from Acoustic Research in terms of innovation and "contribution." Its accuracy and low distortion were state-of-the-art, and clearly the AR-3 was the best loudspeaker commercially available throughout the late-50s and on into the mid-1960s. It literally changed the way the industry thought about loudspeakers, and it is still considered a fine loudspeaker after almost forty-five years. Despite its classic status, the AR-3 was certainly not perfect, and part of that imperfection came from the technical limitations and compromises that existed back in the late 1950s (and to a lesser degree today). The woofer in the AR-3 was crossed over at approximately 1000 Hz., but it was starting to get ragged off-axis by 800 Hz. or so. On axis, AR measured the low-frequency capability of the AR-3 at +/- 1.5 dB, 38-1000Hz, and 6-dB down at 30 Hz. Because of the woofer’s prodigious low-bass output, there is significant, if reduced, output down to 20 Hz. and below. The woofer gets quite "directional" at that upper frequency (in contrast, the AR-3a's 575-Hz. crossover was better, and its 1-1/2-inch midrange driver could go lower than the 2-inch AR-3 unit, and it had greater excursion capability). Nevertheless, the crossover slopes are gentle in the AR-3, so the 2-inch midrange -- with its excellent off-axis response -- is working pretty well at 1000 Hz., and overlapping the woofer's response somewhat. The 2-inch midrange driver in the AR-3 is crossed over at 7,500 to the tweeter, but could have been operated from 1000 Hz. to 15,000 Hz. or so, if the AR-3 had been a 2-way design. The 1-3/8-inch "super tweeter," as it was known, was AR's most perfect driver at the time. It had a gently rising characteristic up through 7,000 Hz. and on out to 20,000 Hz. The 7,500 Hz. crossover was an optimum point for this tweeter. The high-frequency section of the AR-3 had a measured (anechoic) response of 1000-20,000 Hz., +/- 2dB, on axis. Measured 45-degrees off-axis, any direction, the response was -3dB at 10,000 Hz., and -8dB at 15,000 Hz. This is pretty good performance by any known standard. Incidentally, this was not a “system” response, per se, but the individual-driver measured response, measured in AR's and MIT's anechoic chambers. AR published all these curves and made these available to anyone upon request, another unique AR trait. --Tom Tyson Link to comment Share on other sites More sharing options...
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