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Driver for AH-160hz horn: cd vs cone?
Driver for AH-160hz horn: cd vs cone?
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Old 23rd August 2010, 06:50 PM   #11
ScottG is offline ScottG  United States
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Originally Posted by bvan View Post
..cant find any published impedance curves for the 950pb.
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..and also of interest:


I think this one would be better than the Radian for the mid-band (and cost a lot less too):
Note that it is NOT the "ti" version.
perspective is everything

Last edited by ScottG; 23rd August 2010 at 07:20 PM.
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Old 23rd August 2010, 09:58 PM   #12
SunRa is offline SunRa  Romania
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nice find Scott, that Selenium..
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Old 23rd August 2010, 11:58 PM   #13
angeloitacare is offline angeloitacare  Brazil
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I think distortion is complete NO issue for compression drivers, used below Fs.

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These results are important as well as interesting since the insignificance of Level was not anticipated.
The fact that nonlinear distortion in a compression driver is not a significant subjective parameter is quite
enlightening and useful. Prior to this study, the exact opposite was believed to be true; that nonlinear
distortion was a major problem in compression drivers. Regardless of any previously held notions about
the auditory importance of nonlinear distortion in compression drivers, what the data is saying must be
accepted - nonlinear distortion in a compression driver is simply not a factor to its sound quality.
This conclusion is in agreement with other recent publications on nonlinear distortion in
horn/waveguide compression driver subsystems that conclude that virtually all of the distortion in these
subsystems is the result of the waveguide itself.[2] The data shown here is substantial support for this
position-certainly from a subjective perspective.
One significant result from this study is that there is no reason to consider any aspect of compression
driver design from a nonlinear distortion perspective. In fact, one could argue that these results indicate
that distortion could be substantially increased, in order to save money or tradeoff other aspects of the
design for distortion (like sensitivity), without having a negative impact on the sound quality of the
device. Without access to the results presented in this report, the audio community would certainly have
taken exception to this conclusion, and would likely object most strenuously.


there are even 1" compression drivers used to cover down to 300hz.
See the examples with the Sato horns.

links to webpages with pictures and descriptions of Audio Systems with hornspeakers - Page 59 - Audio Voice Acoustics

Jean Michel also confirms positive results :

Jean Michel on LeCleac'h horns

The best sounding low mid compression drivers I used to listen were:

1) Goto
2) WE555 (I have the Alnico French modification by LMT)
2) Onken
3) Yamaha JA6681 (I have 2 pairs of them)
4) TAD TD2001 (yes, a bit modified and on the Sato horn above 250Hz)
5) Vitavox S2
6) Philips

I have not made any measurements. Bass lowpass i use now 300hz/24db.

The Radian has remained in the lower midrange channel.

I would love to try a GOTO UNIT SG-555P

GOTO UNIT SG-555P????????????16???? - Yahoo!??????

an other interesting alternative is the Vitavox GP1, with a large suspension, similar to the WE555a

Vitavox - Page 2 - Audio Voice Acoustics

that driver should aloud to play quit low in a apropriate horn
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Old 24th August 2010, 09:35 AM   #14
Inductor is offline Inductor  Portugal
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Nice pictures in websites. Bring this Eminence PSD:3006-8 2" Titanium Driver 8 Ohm | Parts-Express.com to the bag.
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Old 3rd September 2010, 09:40 PM   #15
bvan is offline bvan  Denmark
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Just saw these posts now, thanks much for the ideas.
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Old 3rd September 2010, 11:00 PM   #16
Flaesh is offline Flaesh  Russian Federation
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Radian 950. impedance in ph2380 (2380 clone(?)) and free air
Attached Images
File Type: jpg 950imp_2380_fa.jpg (59.5 KB, 659 views)
flesh flash flush
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Old 4th September 2010, 06:23 PM   #17
Flaesh is offline Flaesh  Russian Federation
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1245 diaphragm
flesh flash flush
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Old 5th September 2010, 10:21 AM   #18
DorinD is offline DorinD  Romania
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What about this?:

I'm using Selenium D405 in dedicated 90x40 Selenium CD horn and the best sound I've got is for 500Hz@24dBLR up. Also tried 360Hz and 400Hz @18dB/24dBLR but were not so good into my system ( http://forum.audiofil.ro/index.php?topic=524.0 ). Hope it helps.

Last edited by DorinD; 5th September 2010 at 10:29 AM.
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Old 5th September 2010, 01:19 PM   #19
SunRa is offline SunRa  Romania
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Hello Dorin,

Nice system you have over there. Although I knew it for some time, I wasn't aware you are using the D405. Nice..
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Old 5th September 2010, 03:29 PM   #20
whgeiger is offline whgeiger  United States
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The compression driver I prefer to use to cover this range, is the Community M4. See
However, the cost of this unit will bust your driver budget. Other viable candidates operated at slightly higher c/o frequencies [fh] will as well. Alternatively, you can design and build your own phase plug and use a direct radiating low [Qts] driver.
The horn to properly load these drivers is quite large. Horn cut-off [fc] should be approximately octave below the -3db point [fh] of the high pass filter used. Horn length < [fh]/[vs]/4 and mouth perimeter < [fh]/[vs] is contraindicated here. If the horn is of minimum recommended dimensions, then a steep sloped (=> 24/db/oct) high pass filter should be used to protect the driver as it becomes unloaded. Unlike direct radiating drivers, the proximity of the phasing plug imposes displacement limitations on diaphragm movement long before its suspension limits are met.
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