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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: solve a problem + create a problem = still have a problem posted by wazoo on July 31, 2010 at 22:57:55:
I was thinking in your context, what you could do to get some of the features of a 20.1 without buying one.
First, attacking the bass issues- more output and extension. Dual subwoofers operating below 40 Hz would solve both without any drawbacks. This would not make the 3.6 into a push-pull bass driver, but it would relieve much of the strain on the 3.6 bass and let it deliver more output in the remaining bandpass.
The tweeter is truly great, so I doubt the extra "tweaked out" 20.1 tweeter would be a great improvement.
That leaves the midrange, and that is similar to the problem I solved with the line array of Neo 8 drivers (8 to 10). This can also be solved with the BG Radia RD75. That gives you a push-pull midrange down to 200 hz. I prefer the Neo 8 because it is quicker and much more sensitive - you can even power it with flea-watt SETs and has practically unlimited output without distrotion when crossed over - and even with no crossover it works wonders in output.
The array can be added beside the tweeter (or in front of the midrange portion of the speaker - probably at about 1.5 feet ahead and reversed polarity if using original 3rd order slopes). The fun thing here is that the crossover can be applied electronically without altering the speaker, simply notching the midrange out of the 3.6 using a Behringer DCX2496 or similar, and running the midrange either without crossover - or crossed over at 4-5 khz passively at line level since you would want to operate it where its dispersion is still good - and not beyond.
Note on recent experiences:
The output limits without crossover before the bass input starts interfering - I measured over 110 db peaks at my seat when the driver's attempts to produce deep bass well outside its output range caused what seemed to be a rattle like noise and IMD.
I did not manage to reproduce it once again - I did get a rattle on the bass driver but not in the midrange. I raised the volume more, and still didn't get the IMD again. I am thinking that the tape strip that I use to cover the gap between the panels was the cause for transmitting vibrations since after the first occurrence I found that the tape was sticking to the bass panel and loosened it.
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Follow Ups
- RE: solve a problem + create a problem = still have a problem - Satie 01:54:36 08/02/10 (1)
- thanks - wazoo 19:17:33 08/02/10 (0)
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