 Romy the Cat wrote: | | Even if it is possible with a given (multichannel, faulty design) loudspeaker then the DPLOS become very fragile and appears/appears too sudden, without a gradual improvement while approaching the DPLOS. The keys are phase coherency and … surprise, surprise a compliance of the individual drivers between each other. |
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This was exactly the case -- figuratively speaking, the last mm makes a strong perceptible difference. (And this looked very silly from the viewpoint of another person in the room looking at me touching the bottom of a spkr -- and doing visibly nothing, but the sound changed.)
| Romy the Cat wrote: |
Higher order crossovers produce less “maximum amplitude” at the level #3 (my post above) of the DPLOS proximity. Any deviation of crossover from 6db per octave severely minimized articulation and expressive capacity of a loudspeaker. The impedance normalization networks and any resonating chains completely kille it.
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Ironically 12dB per octave coming from a mechanical device (for instance cut off due to the size of a horn bell) instead of electrical resonating chain do not affect Sound so negatively.
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Again, exactly my experience. To state the obvious: given the engineering compromises allowed in the design of the spkrs there seems to be an (equivalently compromised) "optimum" in approaching the DPLOS.
OTOH, the advantage of a mechanical cut-off seems quite logical; or inversely put, an equivalent electrical circuit has much higher variability (apart from the ubiquitous phase anomalies). I don't mean infinitessimal changes perceptible only to a platinum ear -- I mean our beautiful, 1kHz @ 3volts (let's say) xover, complete with designer components that slips to 0,5kHz (just an example) at 5 volts. With a 6db electrical, you have to work very hard getting things right around that xover -- but, at least, it operates more or less predictably thereafter...
| Romy the Cat wrote: | | (the new) location is closer (luckily) to the DPLOS then the original was. |
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Indeed  ! One of the bonuses of working hard to place the spkrs in the first place!
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