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Old 17th January 2007, 12:15 AM   #61
v-bro is offline v-bro  Netherlands
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Good one!
I do this with my ESL mid-treble panels, works great!

I use a piece of 'pritex' for it and put it in a half circle behind the panel, attached to the sides....knobs of the foam pointed towards the 'driver'...Glued pieces in the top and the bottom... It's like a 'foam enclosure'...
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Old 24th July 2010, 09:29 PM   #62
galop is offline galop  Slovenia
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can i use b200 in 3 sistem loudspeakers for mid range?I thinking to use 2 x kef b139 1xb200 and tweeter. Is this right way?
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Old 24th July 2010, 10:07 PM   #63
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db/W/m ?
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Old 25th July 2010, 08:15 AM   #64
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galop - this driver is designed to sound best on it's own, so it's more than capable of doing the bass and treble that other drivers may not. Introducing these extra speakers won't increase the bandwidth by much (that's the usual reason why tweeters/bass drivers are added), but there's likely to be some degrading of sound quality.
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Old 25th July 2010, 08:28 AM   #65
hm is offline hm  Europe
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Default B200

Hello,

"this driver is designed to sound best on it's own"
thats right.

i have superb experience with the B200 in my sat-horns,
also to see at the measurements,
the B200 ist also available in my double horns very good,
specially useful for classic listeners.
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File Type: jpg sathornb200web.jpg (5.3 KB, 199 views)
File Type: gif trumpet B200 0,15,30,.gif (13.2 KB, 197 views)
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Old 25th July 2010, 10:06 AM   #66
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Quote:
Originally Posted by galop View Post
can i use b200 in 3 sistem loudspeakers for mid range?I thinking to use 2 x kef b139 1xb200 and tweeter. Is this right way?
Yes and no. It depends what you want to achieve.

The B200 is well regarded, but possessing both a high Q and a high Vas, it isn't an especially easy driver to work with, and has some characteristics that bother certain listeners, particularly in its higher frequencies. Employing it as a wide bandwidth midrange driver however makes considerable sense, and you may effect a considerable improvement in system capabilities providing the crossovers are located and designed properly.

For example, crossing to dedicated bass drivers at, say, 200Hz will effect a massive improvement on the available dynamic headroom of the system. Horst demonstrates something along these lines with his statelite horns, which are intended to be run to about this point (or just below) and then hand over to bass units. Chances are you would also obtain far more useful bass extension into the bargain, as a single B200 requires a very large cabinet indeed (by contemporary standards) to produce a decent low frequency response. And crossing to a well-selected, quality tweeter at, say, 8KHz should also bring far superior high frequency results, with an improved polar response / dispersion and linearity. Note that in both these cases, the XO is outside the telephone band (critical hearing bandwidth, or midrange if you prefer) defined by Bell Labs back in the 1930s as stretching from 200Hz - 4KHz and amply demonstrated by the Fletcher - Munson / Equal Loudness curves, thus minimising XO related nasties. Both, if done well, should be inaudible in practice. That 200Hz point would suit the B139 rather well as it happens, as it is not a driver that likes being crossed much higher.
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Last edited by Scottmoose; 25th July 2010 at 10:18 AM.
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