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Old 7th January 2010, 04:12 AM   #11
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Any idea what an Alpair12 would sound like in something like this? This is the first I've seen of this thread so excuse me for being behind :S
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Old 8th January 2010, 11:00 AM   #12
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Default alpair 12

Hello,

more for the Posaune, SD near a 6,5" driver,
Alpair 12 Grau - Hobbyhifiladen
the point is
if you can get 100 dB SPLo in the same enclosure
you won´t use a 90 db SPLo driver,

no Xmax or bigger amp will match the difference.
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Old 8th January 2010, 12:02 PM   #13
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Well, despite the fact that I generally prefer high-efficiency drivers, I might, if the lower efficiency unit is fundamentally superior in response, distortion, dispersion etc., and can do without a whizzer cone. To each their own of course.
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Old 10th April 2013, 07:22 AM   #14
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Is it really ok adding much cheaper driver to something like Tang Band W8-1772? What about sound quality after doing this?
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Old 10th April 2013, 09:28 AM   #15
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I believe Horst is only using the indirect / bipole driver to a fairly low frequency (< 1KHz), so it should have less of an impact than if it were being run over a broader BW. How much of an impact upon outright sound quality this will have is open to question -the only way you could really determine the audibility or otherwise would be to blind test. There are some reasonable cheap units out there, though, particularly if you're not asking them to go very high, so I doubt it would be a major issue providing you select carefully.
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Old 10th April 2013, 02:26 PM   #16
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Default darkheart

Hello,
compair my measurement of the RDH20
with the measurement of the speaker of the year 2012
measurement circumstances nearly the same
rdhmess
Voxativ Ampeggio loudspeaker Measurements | Stereophile.com

than imagine that you listen the back invers driver of the BIPOL system
only indirect by room reflexion, you know
Precedence effect - Wikipedia, the free encyclopedia, and
look the bass impedanz below 50 Hz 4 Ohm but bass down 30 Hz
what does that mean for sound, amp, needed watt and tube amps.
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Old 19th April 2013, 06:59 AM   #17
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OK, I saw your measurements, but what about harmonic distortion measurements? I don't believe they look good for Visaton BG20.
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Old 19th April 2013, 08:02 AM   #18
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Default OK

Hello,
i pay for measurement, may be next time i will buy it.

look what happens to membran movement by deleting the impedanz,

Membran movement
interlacing:

My haptic verifications
show a rather linear
membrane movement,
similar to a normal
distribution curve.
Which means a reduction
of "pressure changes",
and hence less mechanical
membrane stress and
maximized sound and SPL

What does that means for distortionß
if you read the feedbacks of all double horns
they tell the same.

believe is no knowledge.
up to 1kHz, invers montage, the BG20 is ok,
today i prefer the Monacor SPH-210 or similar,
might be no notch filter is needed.

Try a free test with the Mini-posaune,
make measurements by yourself,
it is a hobby no profession.
in german but understandable
Hörner
pic from Kornett 3 cm wider
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Old 19th April 2013, 01:53 PM   #19
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Thanks, hm. Maybe I will try it with 3 inch bamboo widerange.
That Monacor driver has a very nice specs. Could you share your own impressions about it? I am looking for some 8inch drivers for midbass and lower midrange duties with fast transient response ans clean midbass. This looks very good.
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Old 9th July 2014, 02:55 PM   #20
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Default rdh20 new driver test

Hello,
i made a test with ffront driver:
H1597-08 FA22RCZ
back invers polarzied Monacor SPH-210
MONACOR INTERNATIONAL : SPH-210

excellent performance,
and improved the stiffness of the enclosure,
left right short stabilized in the middle.
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File Type: jpg rdh20seasBB1web.jpg (17.0 KB, 64 views)
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