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  1. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    SPEAKER CHOICES Revisiting my speaker audition list! Lurkers - any others which I should be adding? ;-) NEW/updated (listed alphabetically): Magico M7 Marten (audition in Munich) Rockport (Lyra - still unable to audition properly, grrr) Von Schweikert Audio Ultra9 (mk2?) + pair of high-level...
  2. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Auditioned a pair in white at Dynamic Audio (Akihabara, Tokyo) in early March. Very novel aesthetic, but its prominent on-axis emphasis right at the ear’s most sensitive 3k region added a persistently excitable layer of grit, and their off-axis cliff-dive in high frequency response, have taken...
  3. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    It’s been a while. The concrete for the basement walls are (finally) being poured/casted during the next week.
  4. QuadDiffuser

    Magico M7 2023

    Any photos or videos to share? For how long will the M7s be available for audition at the venue?
  5. QuadDiffuser

    Magico M7 2023

    Please help post a web link containing details - this will spare me from taking a trip to Magico’s HQ outside of San Francisco!
  6. QuadDiffuser

    Reality is Cruel : Cybershaft new Ultimate OCXO 10M Clocks Shootout OP20 vs OP17

    A TCP/IP "audiophile" network switch does not necessarily perform better with an external "precision" clock connected, particularly when 'mediocre' power supplies and cables are used, as demonstrated by quantitative measurements shown in this video. As with all things High End audio, there are...
  7. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    I've added the Monitor Audio Hyphn to my list of potential loudspeakers to audition and purchase, as it incorporates many of the attributes I'm seeking (co-axial drivers approximating a point-source, constant/linear hemispheric directivity, crossover absence in the critical broad midrange...
  8. QuadDiffuser

    The Digital Director - A new MSB product improving everything from the source to the output

    Three of the best in one video; congrats and thanks!
  9. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Phil, it’s not - there’s a wrong way, and a right way for corner placement.
  10. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    A very educational and important video on the physics of metal plate bass absorbers from RealAcoustix.com's Richard Lenz, presented by John Brandt. My takeaways are: 1) its size should be as large as possible, to increase the probability of good coupling with the very long wavelengths of...
  11. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Hi Lee, I have not spoken with ASC's Art Noxon (yet), as my basement listen room already incorporates what's in Robert Harley's room (from 10+ years ago). But I have been very active in doing research, and reaching out to select room treatment module makers and acousticians to explore...
  12. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    I'm working on optimizing room acoustics - the subject of loudspeaker choice, bass arrays, active bass equalization, etc. is another topic altogether, and I'm not there yet. BTW, I've browsed through the jamesromeyn.com website, and like many other audio component manufacturers, it's basically...
  13. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Hi ADYC, I've started from the position of neutrality with as little bias as possible, and have been repeatedly reviewing the cost, rationale, and specifications for ALL of the proposed room treatments, sharing my research and journey with everyone here on WBF. As the world is so full of...
  14. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Sub-bass Absorption, via metal plates I've decided to skip the heavier 2mm and 3mm steel plates which will require very high corresponding SPLs to become energized, and instead, standardize to just the 1.5mm metal plate (green trace, below), predicted to have a broader "Q" to address peak...
  15. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Sub-bass Absorption, via gypsum "sandwich" wall treatments Bass absorption of the L and R side walls, using a 50mm gap (0mm air + 50mm Rockwool) will be extremely effective for the (predicted) 48Hz axial room mode. Bass absorption predicted for the front/back walls using a 150mm gap (100mm...
  16. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    ROOM NODES - axial The dimensions of the structural walls are being finalized, likely to be fixed into the dimensions entered into the AMROC calculator below; note that the primary axial modes (yellow highlights) are predicted to be 35Hz, 40Hz, and 48Hz. Hence, the room's bass treatment...
  17. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Bass Traps - many! Between the reinforced concrete structural wall and the 27.5mm thick gypsum "sandwich" (12.5mm Sheetrock + 2.5mm damping sheet + 12.5mm Sheetrock), the air space/gap distance (partially filled, with 50mm Rockwool, to maximize frictional losses) will be the following...
  18. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Hi Phil, I also wondered whether applying diffusion on the sidewalls and angling them away would be beneficial, but the bottom line is that in my particular setup, it would be difficult to do this due to its close proximity to the listening position. Therefore, absorption seems to make more...
  19. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    CEILING diffuser canopy Looking at the specifications of various 2D diffusers from RPG, it's evident that the deeper the wells, the deeper the bandwidth, and correspondingly the broader the scatter and diffusion properties. Essentially, I'm looking for as broad, flat, and wide a diffusion...
  20. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Photo below - an example of a listening room with a ceiling canopy filled with 2D diffusers, something I'd like to do, using modules which are deeper (than the standard designs), which have deeper bandwidth. The D'Appolito driver array on the L/R loudspeakers guarantee zero vertical dispersion...
  21. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    The deeper the wells, the deeper the low frequency bandwidth (desirable) of QRDs, but the tradeoff is that more distance needs to be maintained between the listener and the diffusor. P13s...
  22. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    I think the angle of incidence matters a lot, as the amplitude of the diffused reflection will be impacted greatly. While the decorrelated (scrambled) nature of the sound should confuse the ear/brain into being unable to localize these diffused reflections (a GOOD thing to have), being seated...
  23. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    MID-to-HIGH Frequencies: front wall, sidewalls, and ceiling The front wall will be covered with P23 QRDs, which will randomize and horizontally diffuse/disperse frequencies between 185 Hz - 3,400Hz. The ceiling will have a sub-structure built as a canopy, in which diffusers can be inserted in...
  24. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Sharing some very basic screen-capture pics from a 3D rendering video of my elevator-equipped, and solar panel roofed, five-level future home. The 50+ year-old structure was demolished a few months ago, with ongoing sheet piling and column piling. Excavation will take place in coming months...
  25. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    I'm inclined to believe that the heroically (over-) engineered floor isolation design currently proposed by my Acoustics Consultant will NOT be necessary in my basement listening room. 1) vibrations from outside (with no major roads in the vicinity) will be negligible as tons of compacted earth...
  26. QuadDiffuser

    Artnovion Myron E vs Vicoustic DC2 diffuser

    Hi All, apologies for the very belated reply. Having owned both the RPG Skyline and the Artnovion Myron E diffusors, it's important to understand that both are constructed of expanded polystyrene, or basically just another form of styrofoam, except that they are denser than the typical packing...
  27. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    This is by far the BEST YouTube video I've watched on the subject of optimizing room acoustics - Anthony Grimani's advice mirrors many of my own self-taught experiences from past decades! While the design discussed on the video mostly optimizes requirements for multi-channel home theater, the...
  28. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Recently, I discovered that the suspended floor (in the rear 2/3 of the room) is NOT for isolating ground-borne vibrations from the loudspeaker cabinets, but rather for controlling and suppressing room nodes. Well, gosh, darn it, am I being bamboozled? Who here on WBF has ever heard of a 1/4...
  29. QuadDiffuser

    My dedicated audio room build - QuadDiffusor's Big Dig

    Hey Lee, great hearing from you! How have you been since our April get-together in Alpharetta? :cool:
  30. QuadDiffuser

    PSI Audio AVAA C20 Active Bass Absorber

    The DSP version, I have not seen in the flesh, nor read any reviews on. Therefore, I decided to stick with the analog version which I was already familiar with, and thought was more attractive looking. Also, I managed to find them at a generous discount through my audiophile network.

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