- Nov 20, 2018
- Palo Alto, CA, USA
Sure. Those are the corrections that I inserted for use in my room and which I failed to defeat when I sent the speakers on to JA. He became aware of their inclusion only after he ran his sweeps. So, you can ignore those dips.
The still remaining point of disagreement between me and some esteemed members of this forum is the desirability of such hybrid acousto-DSP crossover at 100 Hz for studio use.
Ever since I dabbled in Comsol Acoustic Simulations (https://www.comsol.com/products), I realized that dynamic transducers generate highly complex 3D pressure fields even in idealized or very simple settings.
The way to deal with this inherent complexity was to design studio monitors enclosures and waveguides that allowed keeping the pressure field uniform enough for the human hearing system to not notice the inconsistencies, as long as the listener's head is within sweet spot.
The rest of the pressure field, typically anything beyond 45 degrees horizontally and 15 degrees vertically from the axis, can't be effectively controlled, and thus is usually suppressed using room treatments (but not completely eliminated).
If 8Cs are placed in front of a reflective wall at zero degrees, or in a reflective corner of a rectangular room at 45 degrees, the crossover summation around 100 Hz works acoustically well, and I expect people using 8Cs in such environments to be happy with their spatial accuracy.
If, however, 8Cs reproducing L and R channels are placed at 30 degrees angle to the front wall, as recommended for reproduction of stereo and multi-channel sound, the acoustic picture becomes much more complex, especially if the room is asymmetrical or have asymmetrically-placed furniture.
The acoustic field generated in this case emphasizes some characteristics of sound at the expense of others. The oft-cited 8Cs "wall of sound" and "larger than life sound image" are there, yet accurate instruments placement no longer is.
Acoustically, 8Cs would be both highly accurate and compliant with the placement standards when installed in houses and mixing/mastering studios with hexagonal rooms (e.g. https://3dwarehouse.sketchup.com/mo...f8c07f5d41f5a8/Hexagonal-House-with-Courtyard).
Hexagonal rooms are sparse in the world. Thus the market niches that 8Cs could truly benefit are the ones where consumers care more about the aforementioned Wall of Sound than about the spacial accuracy.