GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Horn-Loaded Speakers
In the Thread: Yamamura's 6 ways

Post Subject: It is not so simple.Posted by Romy the Cat on: 8/8/2013

twogoodears wrote:
Yes, maybe the 120 db/octave is THE trick for complex multi-ways systems of highest resolution, yet this barbaric:-) slope can ONLY be achieved by digital domain crossovering... unfortunately, as a satisfied user of TacT RCS 2.2 XP AAA room-corrector/crossover/DAC/preamplifier, the up-to 24th order crossovering can only be operated in sub/low-end area - i.e. any frequency to blend bass and mid-low, but ONLY this.
That's - among others - the greatest strength of new Be Yamamura's DAC/crossover/music server/software... Lyngdorf is still more limited, only average automatic room correction capabilities and no crossover whatsoever... and, then there is Groundsound, well... maybe it's worth digging it, as the latter allows better digital crossovering than TacT's, but MUCH limited hz-by-hz room correction and time-delays vs. TacT's, still the best... 'til Yamamura's appearing.

Twogoodear, this is not about the devises that do filtering or about the mythical “software” that does post-filtering correction. This is rather my attempt to get a feeling of the new topological move, something that I did not see yet before and something that I have no experience to hear before.
I use the word “barbaric” very deliberately as this is in a way very unnatural way to implement crossovering. This bold way do take care about the worsening of sound that uselessly come from loosing the bits during the slope and this is very good. However it shall also bring a whole arrays of own problems. I know it will but I have no idea how those problems will manifest itself auditably in context of playback.

Those brick-wall filters shall ring like crazy and 120dB per octave shall ring insanely. How will it be auditable I do not know as the brick-wall ringing in context of that system is spread across the channels. With absolutely unpredictable phase shit of each filter I do not know how they manage the system.

Now the most interesting part. If all 6 crossovers (12 slopes) are managed by one possessor then theoretically it is possible to analyze the ringing and phase discrepancies of the each individual slope and compensate it on the contra-slope. People use it in HF brick-wall filtration but the load in this case is a cable or passive and “flat” load. In our case the “load” is 12 compression drivers dispersed in space and analyzer is a human brain that is good 10 feet apart. So, even theoretically it is possible to equate the whole 12 channels delays, phases and ringing patters only for a single point in space. I am not taking about the sweat-spot about wish we accustom to talk in audio. I am waking about a few mm deviations from calculated sweat-spot and then a very sharp 120dB volatile chaos that come outside of that sweat-spot. It is mathematically impossible to balance the channels for 2 ears it might be only for one. Furthermore it is imposable to do it for continue octave but only for one differentional frequency. So it an instilment has let say a continue glissando then the drivers shall have a distinctive slide from in and out if phase cancelation.

This is all theory and I do not know how it sounds in practice. I would like to hear it and to confirm or to refuse my guess. What county the playback is set up?

Rerurn to Romy the Cat's Site