AMT : new player in the game

mige0 · 02:37 PM

There are only very few AMT available for DIY - ESS, Eton, Mundorf, Beyma, Aurum Cantus (?) - and all are insane expensive given the easy construction.

Here is a new one from Harwood Acoustics called "AM 25 AIR MOTION" - welcome !

hifisound eShop * -* HARWOOD ACOUSTICS AM 25 AIR MOTION * A

Seems not much more data available at the moment except a short test in a German magazine where shown data (CSD in particular) look even a little bit better.
Low distortion even up to high levels not exactly on par to competitors but almost

Michael

Telstar · 29th December 2009, 12:04 PM

It looks very good in the Q/P department.

mige0 · 04:23 PM

In the mentioned magazine there are two other AMT form Harwood Acoustics advertised called AM30 and AM35.

They are bigger (150x110mm 180x100mm), have increased sesitivity (~1dB ~2dB), increased power handling (100W 120W) and more are expensive (plus EUR 100.- 200.-)

Didn't find any additional data for those...

Michael

Borat · 29th December 2009, 07:40 PM

Quote:

Originally Posted by mige0

all are insane expensive given the easy construction

i agree. they should sell for $20 a piece.

Telstar · 29th December 2009, 08:02 PM

Some AMT must be assembled by hand (Procide, Mundorf).

paulfx · 8th January 2010, 10:38 PM

...and of course there is nothing wrong with that!

mige0 · 06:33 PM

Quote:

Originally Posted by Telstar

Some AMT must be assembled by hand (Procide, Mundorf).

what parts of the AMT could that possibly be - and - how much time would that steps actually consume ?

I mean
- usually you have the magnets plus top and bottom plate
- the diaphragm in its frame plus glued terminals

anything else?

Telstar · 9th January 2010, 08:54 PM

The membrane IIRC. I saw a couple of those that "came bad".

mige0 · 9th January 2010, 09:04 PM

The membrane in the frame that surrounds it or the membrane aligned in the motor?

tinitus · 9th January 2010, 09:14 PM

Harwood, do they make those drivers
Theres several Fountek and Hivi sold by other companies with different name
Some may be OEM designs from production speakers

26th December 2009, 02:19 PM	#1
mige0 diyAudio Member Join Date: Jan 2005 Location: Austria, at a beautiful place right in the heart of the Alps.	AMT : new player in the game There are only very few AMT available for DIY - ESS, Eton, Mundorf, Beyma, Aurum Cantus (?) - and all are insane expensive given the easy construction. Here is a new one from Harwood Acoustics called "AM 25 AIR MOTION" - welcome ! hifisound eShop * -* HARWOOD ACOUSTICS AM 25 AIR MOTION * A Seems not much more data available at the moment except a short test in a German magazine where shown data (CSD in particular) look even a little bit better. Low distortion even up to high levels not exactly on par to competitors but almost Michael __________________ Audio and Loudspeaker Design Guidelines Last edited by mige0; 26th December 2009 at 02:37 PM.

29th December 2009, 12:04 PM	#2
Telstar diyAudio Member Join Date: Dec 2007	It looks very good in the Q/P department. __________________ The response of the inner ear extends to at least 200khz - Dr W. Tempest

29th December 2009, 04:20 PM	#3
mige0 diyAudio Member Join Date: Jan 2005 Location: Austria, at a beautiful place right in the heart of the Alps.	In the mentioned magazine there are two other AMT form Harwood Acoustics advertised called AM30 and AM35. They are bigger (150x110mm 180x100mm), have increased sesitivity (~1dB ~2dB), increased power handling (100W 120W) and more are expensive (plus EUR 100.- 200.-) Didn't find any additional data for those... Michael __________________ Audio and Loudspeaker Design Guidelines Last edited by mige0; 29th December 2009 at 04:23 PM.

29th December 2009, 08:02 PM	#5
Telstar diyAudio Member Join Date: Dec 2007	Some AMT must be assembled by hand (Procide, Mundorf). __________________ The response of the inner ear extends to at least 200khz - Dr W. Tempest

8th January 2010, 10:38 PM	#6
paulfx diyAudio Member Join Date: Aug 2009 Location: Cary, NC, USA	AMTs by Hand ...and of course there is nothing wrong with that!


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9th January 2010, 08:54 PM	#8
Telstar diyAudio Member Join Date: Dec 2007	The membrane IIRC. I saw a couple of those that "came bad". __________________ The response of the inner ear extends to at least 200khz - Dr W. Tempest

9th January 2010, 09:04 PM	#9
mige0 diyAudio Member Join Date: Jan 2005 Location: Austria, at a beautiful place right in the heart of the Alps.	The membrane in the frame that surrounds it or the membrane aligned in the motor? __________________ Audio and Loudspeaker Design Guidelines

9th January 2010, 09:14 PM	#10
tinitus diyAudio Moderator Join Date: Nov 2005	Harwood, do they make those drivers Theres several Fountek and Hivi sold by other companies with different name Some may be OEM designs from production speakers

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