Quote:
Originally Posted by michael hurd /t/1501074/si-24z-build-8-of-em/540#post_24548393
So tell me, you think the difference is going to be made by taking one cabinet and stacking it on the other, they are basically in the same location, no?
Michael,
I too think he's gained significantly with the new quasi baffle-wall like approach. I've posted before I believe the acoustic efficiencies of the current approach create a great peak summation of in phase energy. Whereas the old approach suffered a somewhat less than optimal SBIR laden impulse ... especially up in the region where notnyt first noted the subjective benefits. I like what he's done, he was encountering bottoming concerns, he addressed it...noting the differences and tradeoffs.
Independent of my personal convictions and approach, and independent of any potential bias' that he brings relative to his experiences, I find notnyt's system makeover from sealed to vented, a fascinating study. He's a contributor I'll always take the time to read.
He's typically as precise as anyone, ... whether it's measuring acoustic aspects or measuring electronic signal path, or simply articulating his subjective findings. He rarely if ever uses hyperbole etc, in his posts. All said I find his contributions to be top rate.
Quote:
Originally Posted by bossobass /t/1501074/si-24z-build-8-of-em/540#post_24548097
I also believe the sealed subs would have shown better low end 'sensitivity' if they had been stacked in the corner as the ported system is, for obvious reasons.
Wrt notnyt's preference for vented, or anyone's subjective preference for any audio related anything, it's consistently been shown that merely a raise in level is sufficient to significantly sway subjective preferences toward the louder item.
Some of his first comments clearly and enthusiastically stated the preference for the vented, as it possessed a more punch or greater visceral component. I suggested the baffle-wall like wave-launch was superior in that the energy possessed greater impulse, greater level of peak summation in phase, less 1/2 space diffraction back toward the boundaries behind and to the sides.
So yeah Bosso, I agree the wave-launch as it existed prior to the changeover to vented, wasn't as optimized as it could have been. And this is especially true in the punch or visceral region. Is it enough to matter? It would matter significantly, in my opinion, but I don't know how much. In the upper range of the previous sealed subs, yes I believe there were acoustic gains left on the table. However, the area of interest for notnyt, ~20hz, not as much as he gained going tuned/reflex.
Quote:
Originally Posted by bossobass /t/1501074/si-24z-build-8-of-em/540#post_24548097
This is nothing new. Callas (with his LLT) and I hashed this out over a number of years. I'm surprised it's being rehashed.
I don't view it as a re-hash, he recognizes and accepts the differences.
Bosso, I know you've mentioned having several dozen varietal subwoofer drivers over the past several years, have you explored either subjective or measured differences, in your room or any room you know well?
Good stuff, thanks,
Kevin