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Multi-Way Conventional loudspeakers with crossovers

Purifi Audio by Bruno Putzeys and friends.
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Old 10th July 2019, 03:42 PM   #21
Antoinel is offline Antoinel  United States
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Purifi Audio by Bruno Putzeys and friends.
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Originally Posted by jan.didden View Post
The next AudioXpress will have a report from me about a presentation Bruno and Lars did for the NL AES section. That will have more technical details about the improvements in both the class D and the driver.

Jan
Purifi APS has a published US Patent Application [20190149920] which is entitled " A Method of Controlling Loudspeaker Diaphragm Excursion" ; inventors Putzeys and Risbo.
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Old 10th July 2019, 04:01 PM   #22
Bill Coltrane is offline Bill Coltrane  Netherlands
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Originally Posted by Max Headroom View Post
Yup, just like I have stated in the past that typical class D amplifier ferrite output inductors are noisy, I also stated that ferrite speaker magnets are noisy and I also stated that I have solution for this, ie Goop changes noise properties of such ferrites.


Dan.
Any measurements, ether objective or subjective that you can show us?
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Old 10th July 2019, 04:32 PM   #23
daanve is offline daanve  Netherlands
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Subjective measurements?? eek:
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Old 10th July 2019, 04:41 PM   #24
Monteverdi is offline Monteverdi  United States
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Originally Posted by Antoinel View Post
Purifi APS has a published US Patent Application [20190149920] which is entitled " A Method of Controlling Loudspeaker Diaphragm Excursion" ; inventors Putzeys and Risbo.
Just scanning this patent this is about electronic driver excursion correction and not about driver design. Many Subwoofer do that is some form and Devialet has an DSP option to correct low frequency of many different loudspeakers called SAM (speaker aktive matching) which is apparently a feed forward implemented based on speaker measurements and not sensors like in many subwoofers
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Old 11th July 2019, 12:32 AM   #25
gabdx is offline gabdx  Canada
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could this be there is some 'electronic' correction applied to the speaker which enables this out of this world (-50db) thd levels ...? and the driver is ordinary except that...

idk if an amplifier can reduce the THD of sine waves... testings.
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Old 11th July 2019, 12:45 AM   #26
Capt Grogg is offline Capt Grogg  United States
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Default Excursion control

Lots of history. Analog Bass Computer by DVR at KLH,many RH pro syztems, TI Smart Amp that Lars Risbo worked on and Klippel Controlled Sound among many others.
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Old 11th July 2019, 01:02 AM   #27
Patrick Bateman is offline Patrick Bateman  United States
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Originally Posted by AllenB View Post
Not dissimilar to these Fostex FE108EΣ, which make a nice little workbench speaker or part of a bigger system. Good midband sound.
this too :

Click the image to open in full size.
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Old 11th July 2019, 02:15 AM   #28
gabdx is offline gabdx  Canada
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Originally Posted by Capt Grogg View Post
Lots of history. Analog Bass Computer by DVR at KLH,many RH pro syztems, TI Smart Amp that Lars Risbo worked on and Klippel Controlled Sound among many others.
ok , can such a system paired with a nominal -30db THD driver, give a 20db advantage in sweep tone testing, then becoming a -50 THD nominal driver hehe.
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Old 11th July 2019, 04:31 AM   #29
Monteverdi is offline Monteverdi  United States
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Stretching the surround (too far) causes distortion and I don't see how these designs really change that. But the surround has its own independent acoustic behavior (even at small to medium excursion), with resonances different from the membrane and I can envision that a more complex shape can ameliorate that by having multiple small resonances and thus reducing distortions caused by the surround. Are there any real data confirming that?
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Old 11th July 2019, 05:54 AM   #30
Max Headroom is offline Max Headroom  Australia
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Originally Posted by Bill Coltrane View Post
Any measurements, ether objective or subjective that you can show us?
Hello Bill, no measurements, sorry about that. Only subjective experience, and conclusion that materials in contact with the ferrite ring or back plate/pole piece interact to some extent and alter sound properties.

Some drivers have for example plastic/foil fancy label (aftermarket car speakers especially) and removing this label changes the fundamental sound ime, ditto drivers with aluminium plate glued to rear of magnet assy.

I have an experimental putty/moulded formulation that when applied to typical magnet assemblies changes driver noise properties and when all drivers are so treated this magnet noise subjectively disappears and all drivers (both channels) merge into one sound source with unusual/unique clarity. You can experiment for yourself....try wrapping kitchen aluminium foil around the magnet assemblies of one channel and take a close listen, you ought to hear a different ASDR envelope that you may or may not prefer, I don't.

Cheers, Dan.
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