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ligs

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  1. AR-5 Frequency Response "Problem"

    It was published in September of 1970. I put that graph in a different thread. Here is the entire page.
  2. Adams, I have been highly impressed by your dedication to better sound through experimentation. I have been trying to blend speakers of different brands and sizes way back when I still owned a pair of AR9’s. I was looking for more natural sounding vocals and clarity in general. I liked the bass of AR9 but above the midbass, NHT Zero, Radioshack LX4(with Linaeum tweeter) and several other brands with stiff metal drivers sounded more natural to me. After I sold my AR9’s, I acquired a pair of NHT 1259(the woofer in NHT 3.3). I also bought a pair of HSU Research TN1220 subwoofers capable of responding to below 20 Hz. Over the years I have paired many more commercial and even some DIY speakers to serve as tops to use with either NHT 1259 or Hsu. I have learned that there have been real advances in reducing the coloration and distortion of the drivers. Technologies such as symmetrical magnetic drive(JBL and Scanspeak), shorting ring for reducing the voice coil inductance(very common now), anodized aluminum cone(Ceramic) for stiffness, waveguide for tweeter and software for better crossover design, all were developed in the past 30 years. More recently, my favorite tops are Infinity R162 and R152. https://www.soundandvision.com/content/infinity-reference-r162-speaker-system Among the DIY speakers I like is a simple 2-way using Dayton RS 225-4 and RS28-A4. I don’t think I have reached my perfect sound yet but I don’t want to stop experimenting either.
  3. A 'NEW' look in AR badges?

    Only until recently I recognized AR could also stand for antiques roadshow. I wonder if AR is a trademark?
  4. Interesting. I have 1976 Edition of High Fidelity's Test Reports. I was looking for any discontinuity of the frequency response of AR 2ax woofer up to and beyond 2000 hz. I could not find any. This brings up perhaps another requirement for good listening: smoothness and paralleling of the response curves over a wide range of angles. Perhaps not just the crossover point( what Hz)but the implementation of crossover design will determine how good the total speaker will sound. In the crossover design, the phases of the component drivers need to compliment each other, otherwise a disruption could result in the final frequency response and dispersion characteristic. Without an EE degree, I am not qualified to comment this in any more details. George
  5. Thanks for the clarification. George
  6. I don't know John Murphy in person but I believe he is the designer behind Phiharmonic Audio speakers http://www.philharmonicaudio.com/ and the author of " Introduction to Loudspeaker Design. 2nd Edition. https://www.trueaudio.com/ild_abt1.htm More about Murphy. https://rhythmaudiodesign.com/pages/dennis-murphy And perhaps he could chime in this discussion. George
  7. Tom, My point was"Measuring multi-way speakers system is always problematic, IMO" In " The Sound Field in Home Listening Rooms by Roy F. Allison and Robert Berkovitz" , response curves of muti-way speakers can look very different depending on the test chambers(2 pi or 4 pi or where in room) and even with or without the cabinet molding. If a speaker is placed well into the room without reinforcement from the wall or floor it could conceivably sound like that measured in a 4 pi chamber which is labeled as Figure 8. George
  8. Just for completeness, I like to include additional response curves for AR3A from the net. I assume the on-axis anechoic response response is at the axis of the tweeter. Measuring multi-way speakers system is always problematic, IMO.
  9. Normally, attenuation of the individual driver changes not only the spl but also the slope of the crossover of the driver and could make the overall frequency response more ragged as seen in the illustration. A true L-pad which provides a constant impedance may be better but I can not find an example for it.
  10. There are a family of AR speakers. I thought it would be useful to show the differences among the several AR speakers so one can choose which AR speaker you wish to match. The comparative frequency response curves were published originally in 1970 from the September Issue of Electronics World by Hirsch-Houck Labs.
  11. “Your comment about the "heavy 12-inch AR woofer having relatively high distortions at higher frequencies" is vague, incorrect and appears to be based on assumption. "Relatively high" compared to what? “ Tom. I am comparing the distortions at 300 hz vs 80 hz from the same speaker, 4.2% vs about 1% at the same 100 db spl. The latter is exceptionally low and is probably still unchallenged even today. I have the 1976 edition of High Fidelity’s Test Reports. The harmonic distortion figures of AR-LST are similar to yours. Interestingly the 8” AR-6 woofer is no slouch either.
  12. Another consideration is the distortion figures of the woofer. The heavy 12" AR woofer, while it has very low distortions at low frequencies, has relatively high distortions at higher frequencies. If the goal is to have the cleanest sound then cutting off the woofer at a relatively low frequency is probably the way to go. The very competent NHT 1259 woofer used in NHT model 3.3 is used only to 100 hz !
  13. I just listened to a pair of NHT 1.3 at my friend's house. They have very realistic, pristine mids and highs when auditioned on stands, away from the walls and directly toward you about 8 ft away. The bass was limited yet very clean and well defined too. I don't have AR speakers with 6.5" woofer and 1" tweeter for comparison. Therefore, I am wondering if the AR bookshelf speakers( designed mostly for use against the wall or 2 pi placement) will sound if placed well into the room?
  14. Here is an article about converting a good 2-way speaker into a 3-way full range speaker by adding a woofer and a passive crossover between the woofer and the 2-way speaker. This is a DIY approach. https://app.box.com/s/a4bqr447s7ox7v9kt7r9tjui0h7yqkrv Here is another one for DIY. https://audionostalgia.co.uk/rogers-ab1-diy-project/#&gid=psgal_43_11&pid=1
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