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ligs

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  1. I owned AR 4x,2AX,3A, 11, 9 , and 15 Hi Res over the years, reflecting the evolution of AR sound from classic to modern era. Each model is quite different except for 3a and 11 with the latter being sounding cleaner to me. As to "Older AR's or, just buy new speakers?" I belong to the camp of " instead of either or, why not having both new and old but make sure they are level matched and properly crossovered. While classic AR speakers have good bass if you like 100 db spl at 20 hz you probably still need a potent subwoofer or two. On the other end spectrum, if you need more articulated treble it is ok to add a standalone tweeter or just borrow the topend of a well design modern speaker. You can use passive crossover or active crossover such as implemented in here George
  2. It is good to know. I felt the same way when I A/B AR 3a with vs without the low pass crossover(2.8mh/150uf). George
  3. It does look like a resistor as in https://www.ebay.com/p/17014131132 It also makes sense to have a resistor in-line with a tweeter for matching with the sensitivity of the woofer. George
  4. AR and JBL speakers sounded distinctly different at one time and the classical music did sound better on AR than JBL in the past. Today, JBL Studio range of speakers, are very smooth (flat response ) play well with all sort of music except pipe organ. This is the reason I am using acoustic suspension NHT 3.3 12" woofer and Revel 8" for the low end and the midrange. George
  5. Thanks, Only a single Crown XLS 1502 is used for all the drivers. I am particularly pleased how seamlessly the low bass blends into the midbass without adding any heaviness or thickness. So both male and female voices sound very natural. I could add a few more recording materials from these speakers but it seems in the reply page one can upload a file of only 1.18 mb, too small for a sound file. George
  6. ZOOM0007.WAV NHT 3.3 has been a well regarded top of line speaker from NHT(Now Hear This). Due to its potent bass performance, it has been favorably compared to the legendary AR 9. JBL Studio 530 speaker is a widely reviewed modern speaker speaker on youtube. I especially like the treble range, clean, well dispersed and without irritating quality. The limitation is its 5 inch factory woofer, which can be distressed if listening in a large room. My project of integrating a NHT 1259 subwoofer(used in NHT 3.3) with JBL 530 involves the following elements. NHT 1259 12” subwoofer for between 200 hz to its lower limit. Revel 8” woofer( cast frame ceramic cone from Revel IW80) woofer from 200 hz to 1500 hz. I borrow this feature from AR 9, which uses an 8” woofer from 200 to 1200 hz. for power handling and low distortion. JBL Studio 530 from 1500 hz and up, using the separate upper range terminals in the back. I use a homemade passive crossover between NHT and Revel a bandpass crossover for Revel and JBL own tweeter and upper crossover. The overall sound is clean, clear , more balanced(in my humble opinion), than JBL 530 alone. I include a snippet of my recoded sound of these speakers. I used a Zoom H1N digital stereo recorder for the soundtrack. I believe the proper blending of the subwoofer with the woofer(or midrange) is very important in the coherence of the overall sound. Also the use of two fullrange speakers in this case also gives you two subwoofers instead of just one ZOOM0007.WAV . In a typical satellite/subwoofer combination, one would normally use only a single subwoofer for both channels. ZOOM0007.WAV
  7. Since you mentioned some subwoofers I played with in the past here is a link about that. I did observe one thing. When you extend the low bass you probably would need a slightly elevated treble to balance the overall sound. George
  8. I think you are right. I now remember 30 years ago, I constructed 2 tubular structures trying to have the same internal volume as the factory AR9 LMR. But instead of looking up the original drawing as you did I just took the measurements of the the two home-made enclosures. Senior moment struck again. George
  9. Years ago I measured the sealed enclosure behind the AR9 8" ' LMR. I remember it was made of a concrete former of about 6" in diameter and 6.5" long. So the volume of the enclosure was less than 0.1 cubic feet. I hope someone else can confirm this. George
  10. I did try to use the DSP to set 80 hz high pass to drive my main speakers. It seemed to work just fine. Presently I am trying to trouble-shoot a stereo speaker level -to -line subwoofer crossover/equalizer(from HSU research) that became unbalanced(one channel louder than the other). It has a 6 db boost at 20 hz in addition to a variable low pass function. I have been trying to trace the circuitry trying to find the problem. Time to refresh my electronics.
  11. It is working out pretty well. The sound seems to become smoother after month's playing. I would rate it as good as my Adcom GFA 555-2 which I had before. The ability of playing down to low impedance (2 ohms) gives me comfort in driving stacked Infinity R253 in parallel with a pair of Peerless midbass ! I have since acquired another Crown XLS 1502. George
  12. Regarding a tweeter capable of crossing over as low as 1200 hz, I want to mention that Carlspeak has identified Dayton RS28F-4 as a candidate. In fact Carspeak used RS28F-4 crossing at 1000 hz to a big 10-inch woofer in Advent Loudspeaker. Carlspeaker even came up the proper crossover for the above system. Therefore, it is very likely this tweeter could be used as a replacement for AR4x tweeter with some adjustments to the crossover. Later, Dayton came up with a replacement for RS28H-4, the new model is called RST28-H4, which retains much of the characteristics of the original tweeter. https://community.classicspeakerpages.net/topic/8427-you-can-now-salvage-un-salvageable-olas/ http://www.loudspeakerdatabase.com/Dayton/RST28A-4
  13. "In realtà, quel valore non è Fs ma Fc; tutti questi dati sono relativi al woofer installato nell'altoparlante e collegato al filtro crossover. Quindi il Qts è il Qtc, Qes è il Qec e così via. È anche evidente dal titolo, AR3a (European)." Translation: In reality, that value is not Fs but Fc; all these data refer to the woofer installed in the speaker and connected to the crossover filter. So Qts is Qtc, Qes is Qec and so on. It is also evident from the title, AR3a (European).
  14. That is good to know. I tried Dynaudio D21(3/4" dome with a semi horn) before in AR3a. The treble sounded too prominent. Now I know why. George
  15. Just a couple more notes about the Peeless 835025 aluminum woofer used in this MTM design. I just found out Mike from AMPsLab had three designs using this woofer. Mike praised its performance and reasonable cost. Here is an example: https://ampslab.com/blog/2021/01/21/grosbeak-tbfc/ I continue to like my MTM speakers. They sound more authoritative and more solid than typical small speakers. In this way they remind me of classic AR speakers with 8" or larger woofers. If anything I like the the treble range to be less analytical and more transparent.
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