QRD‘s on front back side walls? I’ve been told these are not effective on side walls - only front and back. And should not be used in unless in multiples of three (to avoid lobing).
My dedicated audio room build - QuadDiffusor's Big Dig
- Thread starter QuadDiffuser
- Start date
Wil,
I believe that audiophiles don't use QRDs on the sidewalls not because the QRDs are deleterious to optimizing room acoustics, but because the close proximity of sidewalls in typical room sizes violate the rules of minimum separation distance roughly equal to two wavelengths of the lowest frequency bandwidth limit of the 1D QRD, not to mention the expenses of large QRDs and above all, real estate.
In my listening room, I'm lucky to have enough distance from my listening position to the sidewalls to not have to worry.
This has been discussed on this thread previously:
www.whatsbestforum.com
I believe that audiophiles don't use QRDs on the sidewalls not because the QRDs are deleterious to optimizing room acoustics, but because the close proximity of sidewalls in typical room sizes violate the rules of minimum separation distance roughly equal to two wavelengths of the lowest frequency bandwidth limit of the 1D QRD, not to mention the expenses of large QRDs and above all, real estate.
In my listening room, I'm lucky to have enough distance from my listening position to the sidewalls to not have to worry.
This has been discussed on this thread previously:
My dedicated audio room build - QuadDiffusor's Big Dig
Further simplifying, with recommendations expressed in a chart. Accordingly, instead of running my Ground conductor straight through in parallel as I have planned, instead I'll try to spiral it loosely around the tightly twisted Live + Neutral pair. Final Recommendation: The best...
www.whatsbestforum.com
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My custom made in-wall AC cables arrived, in 100m bundles!
From L to R (details inside second image):
16mm2, XLPE insulated single conductor (7-stranded copper), PVC sheathed
10mm2, XLPE insulated single conductor (7-stranded copper)
10mm2 twisted pair, XLPE insulated, XLPE sheathed
6mm2 twisted pair, XLPE insulated, XLPE sheathed
From L to R (details inside second image):
16mm2, XLPE insulated single conductor (7-stranded copper), PVC sheathed
10mm2, XLPE insulated single conductor (7-stranded copper)
10mm2 twisted pair, XLPE insulated, XLPE sheathed
6mm2 twisted pair, XLPE insulated, XLPE sheathed
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This 6mm2 twisted pair AC cable will likely be the star of the show, as so many dedicated listening room builders experienced in auditioning in-wall AC cables have vouched for thinner gauges. I will nevertheless audition it against its larger/thicker 10mm2 twisted pair brother (seen in the background) which can deliver higher current and has lower DC resistance.
I'll simply use the one which exhibits superior audiophile sonics.
I'll simply use the one which exhibits superior audiophile sonics.
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I bought the "stock" version of the 16mm2 XLPE conductor with PVC sheathing because it was readily available and economical, with no need for custom manufacturing.
Using this type of tool, I'll strip off the unnecessary black PVC sheath from the 16mm2 conductor to reveal the conductor within (with its thin XLPE insulation) superb as a Ground conductor having extremely low DC resistance.
I expect to be using the same ~9 meter length of this 16mm2 conductor for all ten of my Ground conductors between the Century breaker box and the component AC power cords inside the audio room. Alternatively, if a thinner more flexible Ground conductor is necessary, I'll switch to the 10mm2 conductor which I also bought as an alternative.
Using this type of tool, I'll strip off the unnecessary black PVC sheath from the 16mm2 conductor to reveal the conductor within (with its thin XLPE insulation) superb as a Ground conductor having extremely low DC resistance.
I expect to be using the same ~9 meter length of this 16mm2 conductor for all ten of my Ground conductors between the Century breaker box and the component AC power cords inside the audio room. Alternatively, if a thinner more flexible Ground conductor is necessary, I'll switch to the 10mm2 conductor which I also bought as an alternative.
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The ceiling grid’s been installed!
View from the entrance door:
View to the entrance door:
View from the entrance door:
View to the entrance door:
Not sure whether the perspective distortion, causing hyper-compression in the far front and hyper-expansion of the near field, is realistic but here’s a render of the front wall, as seen from the listening position sofa:
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The colors and lighting create a warm and comforting atmosphere.
That is going to be a very calm space..are you going to add some lighting under the diffusers.. a deep recess and some lighting would give the illusion of a wider space
The HRS EXR racks will likely be configured with 10” clearance heights for the lower shelf, to maintain a low profile, yet accommodate Seismion Reactio2 active vibration cancellation platforms with decent space left for components. The top shelf will happily accept lots of stacked components (including both the Taiko Olympus music server and the MSB Sentinel DAC) as long as loading limits are not breached.
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Really enjoying this thread and all the details you're sharing. I salute you epic journey building this amazing listening room. Look forward to more updates. Not sure if you've seen this Youtube video, but well worth watching right through. The guy making the video has been visiting various people and their rooms to get ideas before building his own listening room.
Thank you, BFM, for your kind words! I’m glad to share my journey through this labyrinth of complex, often costly and high-risk decisions - as in many respects, it feels like I’m forging a path as a pioneer. I’m also deeply grateful to all the WBF members who have challenged my thinking and generously offered their insights along the way.
As part of my journey of discovery and learning, I traveled to Georgia two years ago to meet Hugh, who was the most generous and gracious host imaginable. He welcomed me into his listening room, and although I wasn’t resourceful enough to create a YouTube video, I came away with many of the same takeaways as the gentleman featured in the video.
As part of my journey of discovery and learning, I traveled to Georgia two years ago to meet Hugh, who was the most generous and gracious host imaginable. He welcomed me into his listening room, and although I wasn’t resourceful enough to create a YouTube video, I came away with many of the same takeaways as the gentleman featured in the video.
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Built a Bocchino IEC plug using my custom-made AC cables, as a trial sample, using the twisted pair of 10mm2 copper conductors insulated and sheathed in milky XLPE (with L and N polarity labelling), and the 16mm2 copper (Ground) conductor insulated in clear XLPE, an absolute beauty. Shrink wrap will likely be used at the entrance to the Bocchino IEC to stabilize the triple conductors.
The outcome was a power cable which has sufficient flexibility to comfortably snake through the conduits which I'm planning to use.
Success!
The outcome was a power cable which has sufficient flexibility to comfortably snake through the conduits which I'm planning to use.
Success!
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Rather than three HRS EXR-1921 component racks connected side-by-side, I'm now more likely to go for three individual component racks because of the greater flexibility in placement, accepting the minor tradeoffs of slightly higher cost and extra width of 6" (152mm).
Might this a wise decision? Welcome any comments from those who have first-hand experience deciding between wide-bodied audio racks vs single racks placed side-by-side.
The anticipated lay out may resemble the center portion this lo-rez image, except that the three side-by-side component racks will be centered much closer into the front wall, leaving just enough space for the cables to "breathe", away from the "must-keep-clear" area between the two loudspeakers.
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Ceiling anchors, structures, and panels are being installed.
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Is there a reason you want all of your electronics on racks between the speakers? In my experience locating the electronics on one side of the room sounds better. I have monoblock amps on short stands between the speakers but everything else is on a side wall.
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