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Chris A

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Chris A last won the day on January 24

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  1. Well, I don't believe he measured "it" wrong, but I do think that he's overwhelmed with what he did measure, and lacks the experience of a journeyman loudspeaker design engineer to make choices from among the "zits" that he measured. I believe that even he (amirm) would agree that is a major factor in his audio measurement journey. He apparently uses relative standards (i.e., how well did "x" do against all the other widgets I've measured in a particular chosen measurement type--which is not a very good way to do business), and lacks judgment in the basic areas of audibility of the measured differences and the tradeoffs that must be made in order to get to a certain price point ($150 per pair of loudspeakers WITH PROFIT MARGIN INCLUDED is below my personal threshold for doing much of anything in terms of loudspeaker design). I think that the author of that thread over at ASR consistently loses track of what he's doing, but that's just my opinion... Chris
  2. The owner of the ASR forum ("amirm") recently acquired a Klippel Near Field Scanner (NFS) system. If you were to pull out your checkbook to pay for one of these, you'd spend something like $100,000 (USD). So this is a pretty big deal. Apparently the first loudspeaker that he reviewed for the ASR forum is the Klipsch R-41M ($149 per pair from Amazon). Here are the results, which will knock your socks off, so at least hang onto your hat: https://www.audiosciencereview.com/forum/index.php?threads/klipsch-r-41m-bookshelf-speaker-review.11566/ Note that the guy "amirm" isn't too keen on understanding where "good enough" meets "better", so understand that he tends to make mountains out of molehills--a lot. This is especially true when he reviews electronics (particularly DACs--where he regularly argues about SNR+distortion performance that's more than 60 dB below the noise floor of the best home theater room available---120 dB(SPL) ). It's also true for his review of the R-41M (but whose review presages many future reviews on at least low cost loudspeakers), although some points that he makes are worth paying attention to. Enjoy! (...I know I did...) Chris
  3. The Xilicas don't have fans. I suppose that the higher processing required for using FIR filters is probably the reason for the fans: https://www.apex-audio.be/products/intelli-x-2-48/ The following taken from here: However, the ability to flatten the phase response as well as SPL response (even using steep crossover filters) is an advantage--if you can isolate the fan noise. Chris
  4. Any DSP crossover having enough PEQ filters (biquads) can do it. See the following for the steps that you take: https://community.klipsch.com/index.php?/topic/182419-subconscious-auditory-effects-of-quasi-linear-phase-loudspeakers/page/4/&tab=comments#comment-2388972 If you need assistance, send me a PM. Chris
  5. Reportedly, the life of the diaphragms is decades (more than 35 years according to a German source that tested an old one recently), as I've seen more than one person state that they have ESS AMTs from the 1970s that still work. The diaphragm backing material is made of clear polyester sheet with metal foil conductive channels deposited on them--much like a PC board, except flexible. When you see a diaphragm up close, you'll understand. They don't seem to be affected by humidity or heat. The soldered connections (2 per diaphragm) are the only failure points if they get too hot, apparently. That can be done yourself if you prefer (e.g., an old AMT-1 that was tested by a German hi-fi magazine some time back): Chris
  6. When you start taking REW measurements, I can help via email. You send your REW .mdat files, I can send back screenshots or text files of the PEQs. For the crossover type that you reference (i.e., nameless, or I call them "fractional order" crossovers just like Tom Danley), there are no HPFs or LPFs used. You use the natural response of the drivers themselves, and trim off the response that you don't need via PEQs. That way, there are no phase shifts through the crossover bands. Shoot me a PM if you want to try the email thing. It usually takes about 3-4 round robin email cycles before you're within ±2 dB SPL response and dialed-in in terms of time alignment--which is usually the most time consuming task to coordinate with the SPL response around the crossover region(s). You'll always have that configuration that you can switch to/from to try vis-à-vis other approaches using traditional HPFs/LPFs. Chris
  7. Same deal here (i.e., pictures of the K-402), except that I've got two K-510 horns with mumps. Your choice. Chris
  8. I'm still working on it. I had an infancy failure of one AMT-1 diaphragm when supplying a 2.7V pink noise input to it to break it in, so my stacked/winged AMT-1 with Khorn clone bass bins is still waiting on ESS to provide the fourth AMT-1 diaphragm that works. I talked to Ricky Caudillo (the ESS CEO) on the phone, who graciously agreed to send me a replacement diaphragm as warranty replacement, but that was ~2 weeks ago and I still have no replacement diaphragm, and no response from ESS from my emails. The AMT-1 driver is rated at 40 W input (no restrictions stated in their specifications), so there must have been a problem with the diaphragm in manufacturing to fail at 99 dB/1m after 5 minutes (nominally 2 W input assuming 3.7 ohm impedance). Chris
  9. I'm using a Yamaha SP2060 presently, so there is no Xilica file to share currently (and I don't have a working Ethernet connection to the Yamaha, so no visualizations there). I've do have a miniDSP 2x4 HD configuration file for my 1981 Belle bass bins and AMT-1s on top (bi-amped): Askew miniDSP2x4 HD settings 20 Jan 2020 - AMTs in middle of Belle top (6.79 inches back from front).xml The channel assignments are: input 1=left input from preamp input 2=right input from preamp output1=left Belle bass bin to amplifier output2=right Belle bass bin to amplifier output3=left AMT-1 to amplifier output4=right AMT-1 to amplifier (Note the scales in each plot.) Chris
  10. I find that it actually depends on the model of the crossover. The original PWK-designed crossovers didn't use a low pass filter on the midrange channel thus allowing the K-55 to roll off naturally on its own--which it does very well. So the "beaming" that you're speaking of is actually an echo pulse that's between 2 and 3 full time periods behind the tweeter's output (usually 0.6 ms), but rolling off fast above 5 kHz. It wasn't until later crossover models that the midrange lowpass filter was added (as I'm told by others here on the forum--since I don't own later Heritage models). I usually set the crossover frequency at 4900 Hz between the K-55 driver (and whichever Heritage horn is being used) and the tweeter (usually a K-77, but it could also be a Crites tweeter) when using a DSP crossover. There actually isn't much latitude between the midrange and tweeter in terms of viable crossover overlap band. Chris
  11. Voila! Success. You might want to zoom in a bit on the SPL vs. frequency plot. I usually use no more than 5 dB/vertical division. Chris
  12. Yes--if you're talking about a DSP crossover (not analog active).
  13. Sure looks like you've got a reversed polarity through that crossover. If you showed the phase plot in your plots above, it would tell you if you've got a polarity reversal. I'd try reversing the polarity on the bass bin leads to the passive crossover and take another measurement--this time showing the phase trace in the SPL plot. Chris
  14. It's 170 Hz without boundary support/gain while driven from the throat (i.e., not off-axis MEH ports). Chris
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