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  1. Mitchco

    [ANNC] Accurate Sound Calibration Services

    Apologise if this is the wrong forum to post, mods please move if required. https://accuratesound.ca/ My company offers accurate sound calibration services using DSP software such as Acourate, Audiolense and Dirac 2.0. Hope you are all enjoying the music in 2020! Kind regards, Mitch
  2. Mitchco

    Intrigued by JBL M2 speaker system .... Opinions please ...

    @iansr - if you are using computer audio, then perhaps consider Acourate software DSP. Here I used it to develop a 3-way linear phase XO, linearized and time aligned the drivers...
  3. Mitchco

    [ANNC] eBook on Accurate Sound Reproduction Using DSP

    Book review on Sound On Sound: http://www.soundonsound.com/reviews/book-review-accurate-sound-reproduction-using-dsp Related article I wrote on Computer Audiophile: http://www.computeraudiophile.com/content/712-mitch-provides-unique-perspective-vancouver-audio-show/ Hope you like it...
  4. Mitchco

    [ANNC] eBook on Accurate Sound Reproduction Using DSP

    Frantz, thank you. Sounds like a good journey! No pics, prototype unit. But it started off as this: http://www.critesspeakers.com/cornscala-style-c.html I replaced both the tweeter horn and compression driver, that now sits on top of the cab. The new waveguide is almost as large as the 90 x...
  5. Mitchco

    [ANNC] eBook on Accurate Sound Reproduction Using DSP

    Michael thanks. I see there are a few reading comprehension issues. Thanks for adding the context. To be clear, the first paragraph of the book description is: This eBook provides the audio enthusiast with an easy-to-follow step-by-step guide for designing a custom digital filter that corrects...
  6. Mitchco

    [ANNC] eBook on Accurate Sound Reproduction Using DSP

    Hi Amir, I hope you don't mind me making an announcement. I wrote an easy-to-follow step-by-step guide for designing a custom digital filter that corrects the frequency and timing response of your loudspeakers in your listening environment so that the music arriving at your ears matches as...
  7. Mitchco

    Redefine your budget room EQ 'flat' target curve to Harman's pro curve

    Thanks for the kind words Audiophile Bill. We are already seeing the future of DSP in products like: http://kiiaudio.com/en/tech-acou.html and http://www.tonmeister.ca/wordpress/2015/10/06/beolab-90-behind-the-scenes/ where DSP is being used to control the directivity of the speaker. Probably...
  8. Mitchco

    Redefine your budget room EQ 'flat' target curve to Harman's pro curve

    Interesting topic. Just passing along some info and impressions as I spent over 30 years with room curves starting with RTA's, 31 band eq's then TEF, 10 years of which working professionally in a variety of recording studios/control rooms and the last 5 years with digital loudspeaker and room...
  9. Mitchco

    Jitter vs no-Jitter

    esldude - have you tried these? http://www.cranesong.com/jitter_1.html bib - I will give your files a try Cheers, Mitch
  10. Mitchco

    Speaker/Room calibration

    Hey Bruce, Nice frequency response! Would be interesting to see the ETC's and Waterfalls as well. Are you enjoying the sound? I wrote an article comparing my untreated room, with acoustics treatments, and with digital room correction. What is novel is that I also recorded the sound of...
  11. Mitchco

    Speaker/Room calibration

    Yes, looks good! You certainly are on the right path. Does your mic have a calibration file for 90 degrees? I wrote a speaker to room calibration walkthrough that may have a few tips and tricks that may be useful. http://www.computeraudiophile.com/blogs/Speaker-Room-Calibration-Walkthrough...
  12. Mitchco

    Speaker/Room calibration

    To follow up, here is the stereo spec for the equilateral triangle (See Annex 1): RECOMMENDATION ITU-R BS.775-1* MULTICHANNEL STEREOPHONIC SOUND SYSTEM WITH AND WITHOUT ACCOMPANYING PICTURE...
  13. Mitchco

    Speaker/Room calibration

    Re: equilateral triangle The studios I worked in have the control room monitors configured in an equilateral triangle. I posted a few pics of control rooms with room treatment a few posts back. If you look, you will see that they are set up as an equilateral triangle. If you search online...
  14. Mitchco

    Speaker/Room calibration

    Bruce, agree with your approach 100%. I did similar, sans the analog eq, and really worked out well for me. I highly recommend a digital laser measurer. I use this one: http://www.amazon.com/Bosch-DLR130K-Digital-Distance-Measurer/dp/B001U89QBU A 20 KHz wavelength is just over 1/2"...
  15. Mitchco

    WAV vs FLAC revisited

    Hi rbbert. I explained in the post that I was comparing in the analog domain and measuring at the analog line output of my Lynx L22 sound card. The 2nd recording/measuring laptop had a -86dB signal to noise ratio using the onboard sound chip (i.e. line amp and ADC). That's the limitation...
  16. Mitchco

    WAV vs FLAC revisited

    Hi Vincent, Bruce is right, that is diigital loopback. But that is why I also performed the other test at the analog outputs as that does cover off jitter and any other distortions/artifacts, including the analog output stage. Again, the difference file, at the analog outs, was -90 dB =...
  17. Mitchco

    Speaker/Room calibration

    Hi NorthStar, thanks. I tried many curves, including flat, X curve, and others and always come back to the B&K target as it seems to have two properties that suit my ears (and seemingly others that were referenced in the B&K and Harmon articles). One is the tonal balance or timbre; sounds not...
  18. Mitchco

    Speaker/Room calibration

    Hey Bruce, Looks good! Have you ever considered Digital Room Correction? I use Audiolense myself, but there are several others. Given the 64bit processing paths, I have never heard any artifacts generated by the digital filters. Here is an example of my Bob Crite's Cornscalas at the...
  19. Mitchco

    WAV vs FLAC revisited

    Aloha Vincent, thank you for putting this summary together. Amir says, "At the risk of stating the obvious, you do NOT want to sync the clocks in the capture to player. The whole point of this exercise is to see if timing of samples is changed. If DAC timing is locked to external source, then...
  20. Mitchco

    WAV vs FLAC revisited

    Hi Vincent, I used http://www.aes16.com/support_faq_result.asp?c=32 loopback capabilities and recorded Tom Petty Refugee, 24/96 FLAC/WAV using Audio DiffMaker on the same computer as the playback software. Here is the result...
  21. Mitchco

    WAV vs FLAC revisited

    Hey Vincent, I included the playback DAC and analog line out stage on purpose. This is a response I just put up at Computer Audiophile as to the reason why. The reason I wrote the FLAC vs WAV and this post was to show that my computer audio playback system is working correctly. FLAC and...
  22. Mitchco

    WAV vs FLAC revisited

    Thanks folks. Pretty easy to do if you want to try it yourself. While not FLAC vs WAV... Here is a the same process used to compare two music players - JRiver vs JPLAY http://www.computeraudiophile.com/blogs/JRiver-vs-JPLAY-Test-Results Cheers!
  23. Mitchco

    WAV vs FLAC revisited

    FLAC vs WAV Part 2 Final Results http://www.computeraudiophile.com/blogs/FLAC-vs-WAV-Part-2-Final-Results
  24. Mitchco

    WAV vs FLAC revisited

    Hey Amir, thanks. Yes, this is a basic null test using the files on disk... I see there is further discussion that maybe during or after the the digital to analog conversion and analog line output stage, there is some thing causing a waveform difference between FLAC and WAV. The...
  25. Mitchco

    The Sheffield Lab Drum & Track Disc?

    Cool. Out of curiosity, and if you can say, what format did the tracks come in on? Meaning, 2 track analog master or digital and if digital what format? Was it a straight transfer or was there processing? Is there any info as to the origin of the files? I.e. which master(s) did they come...
  26. Mitchco

    WAV vs FLAC revisited

    Maybe my approach was not too scientific, but... http://www.computeraudiophile.com/blogs/FLAC-vs-WAV-vs-MP3-vs-M4A-Experiment This was the computer used, nothing special: http://i1217.photobucket.com/albums/dd381/mitchatola/Win7PC.jpg
  27. Mitchco

    The Sheffield Lab Drum & Track Disc?

    Thanks Bruce! And for others chiming in. Do you (or others on the forum) have any recommendations to music with a good sounding kit? I have The Who Tommy, Rush Moving Picture and Yes Fragile from HDTracks. I like the sound of the drums on those downloads. I also like the expansive snare...
  28. Mitchco

    The Sheffield Lab Drum & Track Disc?

    Hi Bruce, I was wondering if you did the DXD remaster of this? I only ask as someone commented you did: http://www.amazon.com/review/RN2XUC89XHUJ1/ref=cm_cr_pr_perm?ie=UTF8&ASIN=B003JG93DC&nodeID=&tag=&linkCode= I have the orginal CD pressing and really dissapointed in the drum...

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