| Re: But will it play Metal? [message #21238 is a reply to message #21236] |
Wed, 17 August 2005 06:42   |
Bob Brines
Messages: 186
Registered: May 2009
Location: Hot Springs Village, AR
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Master |
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It all depends on what the BR/MLTL resonant frequency is. My 6" Fostex BR's have Fc=60. They are fully unloaded by 40 Hz and show significant excursion on most program material. Therefore, I cross them at 80Hz to a sub and the problem goes away. They can play very loud with little IM distortion. My 6" Fostex MLTL's have Fc=40. They don't unload significantly until below 30 Hz. There just isn't much program material down there, so excursion isn't a problem. Of course, they DO run out of excursion first at 80-100 Hz, and this is what limits the ultimate undistorted SLP. Bob
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| 10-4, Martin & Bob [message #21239 is a reply to message #21237] |
Wed, 17 August 2005 07:42 |
Ed Schilling
Messages: 47
Registered: May 2009
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Baron |
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Martin,
Thanks. We are in "agreeance"(to quote some Rock Star).....for the most part. I have never designed a BR....nor have I heard one I could live with. Not sure why this is so, but it is.Playing warble tones I can not "see" the driver unload (in my favorite speaker) until the freq. is below audibility........but I know it happens. Bob,
Thanks, The TL's I have built seemed much as you described.......they did unload, but the freq. was low enough it did not seem to matter. I was under the impression this is a much bigger problem with a BR.......and also I am opposed to "wasting efficiency" with compensation networks or notch filters, when a single driver is used. Limiting the response below resonance seems reasonable to me in some cases. I don't do it as a general rule., however, because I seldom use a sub and simply prefer the sound of the speakers with no filters or components in the signal path, at least in the case of my "favorite" speaker. I do use a HP filter on my TV system........but those are ONE INCH full range drivers! They MUST be rolled off at about 200 Hz to have any power handling at all!
Thanks, guys
Ed
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| How about an... [message #21255 is a reply to message #21213] |
Wed, 24 August 2005 12:39 |
Crazy Dave
Messages: 67
Registered: May 2009
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Viscount |
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Eminence Beta 12LT. They are cheap, go quite low, efficenct, and play loud. The only down side is that you are going to need a helper tweeter. There is lots of DIY information on the web about this driver. Dave
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| Maximum SPL charts [message #21297 is a reply to message #21236] |
Mon, 12 September 2005 08:40 |
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Wayne Parham
Messages: 18784
Registered: January 2001
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Illuminati (33rd Degree) |
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A bass-reflex speaker is unloaded below the Helmholtz frequency. A transmission line is unloaded below its quarter-wave frequency. And a horn is unloaded below its flare frequency. This is particularly true for back-loaded horns, which act very much like bass-reflex cabinets or transmission lines in this regard. In each of these cases, excursion goes up rapidly when frequency drops below their passbands.As for your comments about maximum SPL, here's a chart that will help quantify matters. Below is an SPL chart based on Fostex specs. Add 6dB for π/2 radiation, where applicable. I've included maximum output based on the 10log figure, which of course assumes that X-max is not an issue and that there is no compression. In other words, the maximum SPL listed here is rather optimistic.
[Model][size][SPL at 1W/1M][Max power][Max SPL at 1M][Max SPL at 10 feet][Max SPL at 15 feet]
=============================================================================================
F83E 3" 88dB 10watts 98.00dB 88.25dB 84.75dB
F120A 5" 89dB 30watts 103.75dB 94.00dB 90.50dB
F200A 8" 90dB 80watts 109.00dB 99.25dB 95.75dB
FE87E 3" 89dB 15watts 100.75dB 91.00dB 87.50dB
FE103E 4" 89dB 15watts 100.75dB 91.00dB 87.50dB
FE107E 4" 90dB 15watts 101.75dB 92.00dB 88.50dB
FE108EΣ 4" 90dB 24watts 103.75dB 94.00dB 90.50dB
FE126E 5" 93dB 45watts 109.50dB 99.75dB 96.25dB
FE127E 4.7" 91dB 45watts 107.50dB 97.75dB 94.25dB
FE166E 6" 94dB 65watts 112.15dB 102.40dB 98.90dB
FE167E 6" 94dB 65watts 112.15dB 102.40dB 98.90dB
FE168EΣ 6.5" 94.5dB 80watts 113.50dB 103.75dB 100.25dB
FE206E 8" 96dB 90watts 115.50dB 105.75dB 102.25dB
FE207E 8" 95dB 90watts 114.50dB 104.75dB 101.25dB
FE208EΣ 8" 97dB 120watts 117.75dB 108.00dB 104.50dB
FF125K 4.5" 92dB 50watts 109.00dB 99.25dB 95.75dB
FF165K 6.5" 94dB 70watts 112.50dB 102.75dB 99.25dB
FF225K 8" 96dB 100watts 116.00dB 106.25dB 102.75dB
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| Re: Jordan or coral [message #21438 is a reply to message #21228] |
Mon, 20 February 2006 03:47 |
lippmann
Messages: 1
Registered: May 2009
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Esquire |
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I have a few pairs of Japanese Coral 6" fullrange (6m-1) Alico. built in 1968 to 1970, new old stock, if this is also what you are looking for, please contact me with your offer.
thanks.
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