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In Reply to: RE: How many quads should I stack? posted by hahax@verizon.net on January 30, 2016 at 21:05:47
I'm confused that it won't move the -3dB point lower. Won't overall SPL be down by adding extra panels in parallel but since there are more panels, the -3dB rolloff for bass should be better with more surface area to move air no? However insignificant, more bass panels = more ability to play lower. It doesn't matter if excursion is the same, if 4 things are trying to play 35hz now as opposed to 2, the SPL has to be higher no?
Follow Ups:
The 63 is a very unique design unlike just about any other speaker ever built.
The speaker produces bass over its entire area. The outer 'bass' panel, a bit of a misnomer, simple increases the size of the baffle.
Adding extra bass panels will not make the speaker play any louder or go any lower.
Yeah I've read that each panel is in fact full range, it's just that the concentric circles do the time delay? It still escapes me how adding additional "bass" panels doesn't affect the SPL in a conventional way. Is it because the outer panels are essentially the "outer ring" in the time delay not really translating to a whole panel being excited for playing low notes?
The delay line assembly performs several functions. It rolls off more and more top end as we move out from the central area to prevent beaming, delays in time each successive ring to emulate a point source, and attenuates output to each ring as we move out from the central area. The outer ring is down in output substantially compared to the central full range area.
In theory yes adding more bass panels will increase output but given the low output of the outer ring, the bass panels, one would have to add a whole lot of them to have any real impact.
If what you want is more output, more bass energy you have a couple of options. Add a good sub or find a different speaker. The 63 is what it is. No amount of tweaking adding bass panels, etc., is going to change the nature of the speaker.
This is good advice and really sheds light on the situation at hand. I'm definitely now leaning towards leaving them as they are, other than the restoration. I'm very happy with the sound, they just sound so good it's easy to get carried away with the right material. When I blew up the one the other day, I definitely didn't think they were playing quietly. I decided to push the limits and see what happens and well, I had failure. I'm also using 3 micron thickness which may be much more susceptible to abuse.
The speakers were originally built with 3 micron film. Gauge of the film will have no impact on reliability.
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