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Old 1st November 2007, 07:13 PM   #11
Sypher is offline Sypher  France
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Thanks, i'm gonna get information about your "transmission line" project cos i don't know what it is
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Old 1st November 2007, 07:13 PM   #12
Sypher is offline Sypher  France
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ok, is it that?

Click the image to open in full size.
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Old 2nd November 2007, 12:15 AM   #13
tinitus is offline tinitus  Europe
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This 12" probably wont have lots of heavy "punch" but will rather be impressively snappy and precise ... actually I dont think you will get much impressive punch with any 10", fore that you may need double 10in

Nahh, this driver probably have too high Fs fore hifi, but I do think its a real sweet looker ... and what makes it useable fore hifi is that fore PA relative low SPL, which should count fore some bass orientation
But it has pretty good linear Xmax of 9.2mm, hence would take some Eq

http://www.precisiondevices.co.uk/showdetails.asp?id=80
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Old 2nd November 2007, 12:20 PM   #14
kyselym is offline kyselym  Czech Republic
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I don't think it is a good idea to cross L26 at 300hz, well at least without any modification. 200hz or lower seems to be ok. My way would be going with multiple smaller drivers but not in simple 3way. Monacors C look good. What about SPP-300/AD ? seems good as well and is "cheap"
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Old 2nd November 2007, 01:09 PM   #15
Sypher is offline Sypher  France
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Yes tinitus, it seems to be the right choice, if it goes up to 50 hz, it's ok too.
But i can't find one for sale anywhere.
I've already looked round a little for 12" PA but except for Beyma 12b100r (and now the precision devices ) none seems to be willing to go down.
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Old 2nd November 2007, 01:09 PM   #16
Sypher is offline Sypher  France
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Maybe this one?:
http://www.precisiondevices.co.uk/showdetails.asp?id=63
With an equalization it looks ok and doesn't cost too much ( 100€). Has someone ever had experimented precision devices? Does it sound well?

ps: it works with an active crossover via a PC, so it isn't a pb to make a "bass boost"
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Old 2nd November 2007, 02:48 PM   #17
AndrewT is offline AndrewT  Scotland
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Hi,
that 12inch PD driver is a high efficiency PA bass speaker.
It is not intended for sub-bass duty.
__________________
regards Andrew T.
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Old 2nd November 2007, 03:35 PM   #18
tinitus is offline tinitus  Europe
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Sorry to say that the PD driver I linked to seems to be discontinued ... it was interesting because it wasnt too effective

Andrew, I clearly understood that its not a sub he wants, but a driver with midbass punch and still able to go high with clean rolloff

Beyma 10LW30N seems to behave very nice in about 50liter BR
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Old 2nd November 2007, 05:35 PM   #19
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they are many options up for you, though i'd personally not go for a PA driver.

L26 is an ok driver for you to cross at 300hz ! main breakup is at 4000hz so you dont have any HD3 distortion byproducts before 700hz or so, so quite ok for a 300hz crossover, even 12db...

the problem you're gonna have if you go passive is sensivity. Since thoses davis drivers are quite efficient (rated at 92.6 , but actually i know they're close to 89 db W/M,from having worked with em, wich is still not bad) and you're probably gonna want to compensate for baffle step , you're gonna need 95 db of sensivity. 93 would be enough for semi BS.

So using two drivers by side is quite attractive since it raises sensivity.

http://www.riviera-acoustics.com/cat...roducts_id=795

going with two of those would be quite attractive since they're cheap, low distortion and quite high sensivity. However, they're big. Two 12" a side may be too big.

if you don't need full baffle step, thoses could be an option

Peerless Exclusive 8"

even lower dist, good extension in a vented box, to around 25hz -3db i'd say looking at the specs.
Jon marsh tested them at htguide : 1 2 3 testing
he noted the cone flap at 900hz that disqualified the driver for the use he had in mind, but for your use it would be just perfect
(Personally that'd be my choice. You got scanspeak distortion and quality for a lot cheaper with thoses)

Monacor SPH-225C

thoses are not as known, but monacor usually does good quality stuff. No distortion information on it though.
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Old 2nd November 2007, 07:01 PM   #20
tinitus is offline tinitus  Europe
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I am by no means a PA fanatic at all and would sure like to have at least some of that 30hz too, but I have heard even quite cheap semi PA drivers make rather expencive hifi driver sound like the worst cheap toy drivers with no real bass at all
In many other cases where there really is some sub lows, its very often too much out of control
No, I dont belive that most hifi woofers can present any real slam ... they are too refined and civilized
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