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In Reply to: RE: DIY room lenses (shakti hallowgraph) on the cheap posted by YRY on February 05, 2021 at 10:29:47
Trying to figure out how to answer, but here goes. When we set up new speakers, we try and configure them a certain distance from the walls and what we hear from our listening position. Two different people might set the toe in angle differently, the speaker position, etc., according to what sounds best to that person.
The hallowgraphs may be an extension of that, in that you are trying to improve, soundstaging, details,naturalness, bass reproduction, etc. by aiming these devices in a particular direction.
In my case, I assumed (wrongly) that toeing them out would open up the soundstage, and that toeing them in would give more detail, which in general is true. Over time I found that it depends on the recording, for instance sometimes orchestral music sounds best with them toed in, and ensemble music might sound best with them toed out. I eventually put the Hallographs on lazy susans, so I could pivot them easily and determine what position sounds best, which for most people is a PITA and many times I just leave them where they are.
If you ever put on a recording and you are wanting the soundfield to open up, or you're wanting more richness in the notes, give these a try.
Sorry for the long explanation.
Follow Ups:
I've read some reviews that seem to mirror your experience And while it sounds like they can certainly benefit certain setups, you could be going down a rabbit hole if you combine them with position-sensitive speakers.
I don't think so. The idea is to enhance the sound, and I don't know of any speakers they wouldn't work with (I think Jonathan Valin of Absolute Sound still uses 4!).
Previously I used them with my Dunlavy's, and when I switched to open baffle Spatial Audio speakers, I thought I would no longer need them because the open baffle/room interaction would be different. Wrong! As it turns out the Spatials use "controlled directivity" which MINIMIZES room boundaries--that's part of the appeal of the design. Having an open baffle design, you would think would use more of the room nodes, but not in this case.
At any rate, what I present on this forum is a very low cost project that is easy to do. You decide if it works! The hallographs (I misspelled them)are still being sold at $1495. The first pair I made out of oak, the second pair out of cheap wiggle molding. Is there a difference in sound? Even with a different design, they still work. Do they work as well as the originals? Can't say. Good luck!
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