'Audaxity' a project featuring the HM100Z0 - diyAudio
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Old 13th January 2006, 04:07 PM   #1
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Default 'Audaxity' a project featuring the HM100Z0

Audaxity? Why? Because hopefully its got the cheek to challange much more expensive designs

After some interesting conversations and comparison regarding the Audax HM100Z0 4" midrange driver I decided that I've got to try this one.

To cut to the chase, I've had it on good authority that this driver is a potential giant killer among pure midranges. Comparisons have been made to the ATC SM75-150 and SM75-150S dome mids which in my mind are the ultimate pure midrange drivers. The best part about it though is that the Audax can be had for a measely 35 each or around 60Euros compared to 280/395 for a single ATC depending on standard or super configuration.

The bad news is that these driver have been out of production for over a year now since Audax pulled out of the DIY and driver sale market. So unfortunately that means that these are becoming increasingly rare and will continue to do so.


Where to get the HM100Z0:

For the fellow UK folks I've found one source that still has 'plenty' of these drivers:

http://www.iplacoustics.co.uk/

Like I've said before they're 35 each + postage.

For our Central European friends I've found one supplier that seems to have a rather large inventory of popular Audax units including 4 of the HM100Z0's:

http://www.cadaudio.dk/audaxunits.htm


TS Parameters:

The Thiel Small parameters for the HM100Z0 are as follows:

Click the image to open in full size.

I'm really not sure if these are for the old version without the phase plug or the newer one with. Could any please clarify and correct please?


Any idea's?

I've found it hard to come by anything in the way of plots such as FR, impedance, waterfall etc. ANY information would be greatfully recieved.
I have dug up a few old threads on here and a couple of webpages all regarding the HM100Z0:

3-way active design with Scanspeak 2905-3000, HM100Z0 & HM210Z0:
http://www.soton.ac.uk/~apm3/diyaudio/Speakers.html

Hifi World KLS-6 design but the page is in french
http://membres.lycos.fr/jadai/Kls6.htm

Old discussion threads:
http://www.diyaudio.com/forums/showthread/t-31440.html
http://www.diyaudio.com/forums/showt...p?postid=66766

A review of a commercial design with the HM100Z0 and HM210Z0:
http://www.hometheaterhifi.com/volum...s-11-2002.html

It looks as if its possible to use the newer version of the HM100Z0 up to at least 5Khz and down to around 300-500hz. Anyone have any thoughts on a suitable bass and treble, I've got a couple of idea's but I'd like to investigate further before making a fool out of myself

Anyone with any experience with this driver - please speak up, I would greatly appreciate it.
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Old 13th January 2006, 04:46 PM   #2
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No direct experience with these drivers, but my current 2 ways use the larger HM210Z0's and they have a very smooth response up to 3KHz, not bad considering they're 200mm.

The HM100's were all the rage about 7yrs ago when Hifi World mag did a range of speaker designs (I built the KLS9's, 2-ways with HM210Z0 + tweet). Their larger 3-way design (KLS6?) used the HM100Z0 as a mid and used it's extended response to allow them to use the quirky (and EXPENSIVE) Audax piezo tweet , I remember they revisited the design a few months after it was printed in the mag, as they'd crossed the little 4" too low and it was suffering over-exertion in the mid-bass range. (This is all from memory by the way, not bad for a friday after pub lunch an all that!) The new design I believe crossed over at 400Hz to the HP100Z0 and it ran up to about 5 or 6KHz. Just checked the World audio design website and they're not doing speakers anymore, looks like Audax are definitely out of DIY..

Cheers,

Len.
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Old 13th January 2006, 04:50 PM   #3
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Hmm.

Well, I'll have to think about the bottom end, but for me, for a true budget giant-killer system, the tweeter is obvious, the Morel MDT30/2. I would suggest the 33, but it is priced outside the brief.

As for plots, measurements and stuff, I don't know if I have them to hand any more. A lot of my measuring for my speakers was done before computers, so a lot of it was on paper, and that was two house moves ago. Still, I'll have a dig around, and see what I can find.
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Old 13th January 2006, 04:52 PM   #4
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Quote:
Originally posted by len_scanlan
... the quirky (and EXPENSIVE) Audax piezo tweet...
OY YOU! That's fighting talk... Outside now!

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Old 13th January 2006, 04:56 PM   #5
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I forgot to mention that I'd like to keep this one as cheap as possible but without compromising the sound quality.

What are peoples thoughts on:

Tweeters:
Morel MDT30s or MDT32s

Seas 27TBFC/G or Seas 27TFFC

Vifa XT25TG-30-04 or XT19

Maybe the Excel T25C003 which is a little spendy and probably breaks the rule of keep it cost effective.

I've no idea on the bass though. It seems difficult to really get killer woofers that are reasonably price(less than 100 or preferable 60-70) or easy to get hold of.
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Old 13th January 2006, 04:57 PM   #6
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Opps cross post, so you suggest the MDT30 or 32 then Al?
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Old 13th January 2006, 05:04 PM   #7
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Hi ShinOBIWAN, (sorry for my english)
That is the old version ( Fs=250 Hz)
The "new" version have Fs= 175Hz and Xmax= 1,25mm (if I well remember) plus the ogive. This is my actual mid and sure it is a "monster"!!
Cheers,
Inertial
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Old 13th January 2006, 05:06 PM   #8
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Quote:
Originally posted by len_scanlan
No direct experience with these drivers, but my current 2 ways use the larger HM210Z0's and they have a very smooth response up to 3KHz, not bad considering they're 200mm.

The HM100's were all the rage about 7yrs ago when Hifi World mag did a range of speaker designs (I built the KLS9's, 2-ways with HM210Z0 + tweet). Their larger 3-way design (KLS6?) used the HM100Z0 as a mid and used it's extended response to allow them to use the quirky (and EXPENSIVE) Audax piezo tweet , I remember they revisited the design a few months after it was printed in the mag, as they'd crossed the little 4" too low and it was suffering over-exertion in the mid-bass range. (This is all from memory by the way, not bad for a friday after pub lunch an all that!) The new design I believe crossed over at 400Hz to the HP100Z0 and it ran up to about 5 or 6KHz. Just checked the World audio design website and they're not doing speakers anymore, looks like Audax are definitely out of DIY..

Cheers,

Len.
Thanks for the input Len,

Sadly I started doing DIY home speaker less than 3 years ago but have been building subwoofer for more than twice that. This of course meant that I was pretty much oblivious to Audax at the time and when I did look into them I thought them to be inferior to the stuff from Seas and Scanspeak etc. - typical noob attitude.

I'm hoping to get a taste of something that's cheap but can come close to the DIY ATC designs I'm using now. Its going to be very interesting comparing a 500(estimated) design to one that cost over 3500. And I'm optimistic that it will come close
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Old 13th January 2006, 05:08 PM   #9
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Quote:
Originally posted by inertial
Hi ShinOBIWAN, (sorry for my english)
That is the old version ( Fs=250 Hz)
The "new" version have Fs= 175Hz and Xmax= 1,25mm (if I well remember) plus the ogive. This is my actual mid and sure it is a "monster"!!
Cheers,
Inertial
Thanks Inertial,

Its the newer ones with phase plugs that I'm getting.

I expect the Qes, Qtc and Qms are all different too? Does anyone have definite TS specs on the rev.2 HM100Z0?
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Old 13th January 2006, 05:22 PM   #10
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What about a 10" Peerless XLS on bass?

Vikash is doing them for a very reasonable 94 each.
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