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About mitchco

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  1. Wow @hulkss that is some engineered system you have there! Like I say, I would love to hear it! 14 x 15" woofers, that must be some slam! Just in case you did not see it, JRiver 27 will have VST3 support: https://yabb.jriver.com/interact/index.php/topic,126706.0.html Still likely need the metaplugin... Thanks for sharing!
  2. @hulkss very cool man! Would love to hear your system! Very interesting about DTS Neural Surround UpMix, will have to look into that... Curious about what your JRiver DSP Studio looks like and the order of your plugins... How is the MSO filter added?
  3. HI @hulkss Cool! Any photos of the setup to share? Or a graph or two of the result? Cheers, Mitch
  4. Hi @deneb thanks for the kind words. Perhaps Thierry @fresponse can point us to the sweep signals...
  5. @Cazzesman Thanks! The listening is a lot of fun, but the writing is a lot of work as I am more familiar with programming languages than English 🙂 The Kii Three's you and @firedog have are something special for sure. The least coloured speaker I have listened to yet. As I understand it, Bruno had control from analog/digital input to acoustic output. The corrective feedback loop encompassed the entire signal chain and acoustic output devices. There are a number of patents that cover the details of some of the pieces. It will be exciting to see what Purifi does next!
  6. Hi @R1200CL Dirac is a bit different than other DSP software in that it uses a combination of IIR and FIR filters. This paper covers how it works, Controlling the impulse responses and the spatial variability in digital loudspeaker-room correction." Note Dirac does not have many user adjustable controls... This short primer on FIR Filter for Audio Practitioners answers your questions on calculating the number of taps and frequency resolution. If you really want to get into it, then I suggest this accessible text on, "The Scientist and Engineer's Guide to Digital Signal Proces
  7. Hi @skatbelt Both Acourate and Audiolense DSP provide sophisticated digital XO capabilities. One can choose the type of digital XO, slopes and number of XO points. Here is an article on Acourate for a triamp system and here is another article on Audiolense that integrates and time aligns dual subwoofers with stereo mains (which also happens to be biamped). Since the latter article, I upgraded to dual Rythmik F18 subs crossed at 45 Hz with a steep digital XO, as you can see in the Audiolense article. Further, these XO's sum perfectly in the frequency and time domains. You can see the frequency
  8. Hi @R1200CL room correction and Room Shaper are two different technologies solving two different types of room acoustic problems. Room correction, in the context of this article, corrects both the frequency and time domain. Room Shaper reduces the low frequency "decay time" in a room. Room correction filters, in the context of this article, are static FIR filters that are convolved with the music in real time. Hence requiring a convolver to work. Room Shaper is not a static filter and processes the incoming signal based on a threshold level and strength that the user sets.
  9. Hi @Bob Stern, it is proprietary psychoacoustic smoothing.
  10. Hi @ALLDIGITAL as @The Computer Audiophile and @firedog have mentioned, flexibility is key. Another technical point I would like to bring out is that all h/w DSP solutions, whether they be Lyngdorf, miniDSP, Trinnov, DEQX or Audyssey that is used in so many AVR's, is that their filtering capabilities are very limited. How much "filtering" that can be done is based on the number of FIR filter taps available. In these h/w devices the number of filters taps available is typically limited to 1024 taps or up to 4096 and at the extreme, 8192 taps. Whereas the filters that can
  11. Thanks @blue2 Other than a UMIK-1 mic, a Mac, and REW to take the measurements, the hardware is listed under the picture of John's @Olesno system. I can export the REW impulses and import them into Audiolense. On this site, you will find a number of "walkthroughs" I wrote using Audiolense, Acourate, and Dirac. These should provide you with most of the details to your question.
  12. Hi @R1200CL Here is my review of Thierry's Room Shaper SW. Note Thierry's RS is based on events detection and modifications of only some portions of the input signal. It requires a VST plugin to operate. Re: Audiolense XO - this version has the time domain correction capabilities which I recommend. I use commercial DSP software like Acourate, Audiolense, and Dirac designed for loudspeaker and room correction. Kind regards, Mitch
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