Audax HM210Z12 project help !

[djiv]

Hello,
I`m from Bulgaria. Sorry for my bad english!

I have a 2 pieces Audax HM210Z12 8 inch drivers. I want to do my first Diy project. Can you help me with the boxes. I`m searching for other projects with the same drivers, but can`t find them. I want to do a project like KLS9 but the drivers are not simmilar parameters. There are HM210Z0 and the resonance of the drivers is different. I don`t know how to start.

thanks very much!
best regards

[Dick West]

Here is information from a 4 year old Parts Express catalog:

Voice coil diameter 1.5 inches
Voice coil inductance -- 1.44 mH
Nominal impedance -- 8 ohms
DC resistance (Re) -- 6.2 ohms
Frequency range 32-3000 hz
Magnet weight 20 oz.
Fs 32.0 hz
SPL 90.7 dB 2.83V/1m
Vas 3.05 cu. ft.
Qms 3.24
Qes .37
Qts .33
Xmax 4.4 mm
Net weight 5 lbs.

Hope this helps.

Dick

[djiv]

Thanks, but i have the parameters of the drivers. I read all posts for Audax HM210Z12 in this forum, but i can`t find a project with them. The Kls9 is with HM210Z0. I want to do almost the same 2 way project. Does somebody has experience with these drivers?
Can yo help me?
Thanks

[Dick West]

I doubt you will find a completely finished project for this driver. The parameters will tell you how to make the box for the woofer, how large it should be, and the size and length of the tuning port if you make it a bass reflex cabinet. To do this you can use WinISD (free) box modeling software.

The crossover between it and the tweeter specified in the Kls9 will be almost identical. You can tweak it by ear to accomodate the slight difference between your drivers and their previous models.

I doubt you will find much more help.

You can go to this web site for some info about a 3-way project using two HM210ZO 8" drivers per channel:

http://www.blackdahlia.com/polyarti.htm

There you will see that only slight modifications were made to use this later model of the original HM210ZO drivers.

Cheers

[DarkOne]

Hi djiv,

I've already asked on forums if this driver is suitable for 2-way loudspeaker, but it seems that it's not. Driver has some breakup around 1.9kHz which can be seen on amplitude response, impedance and also on waterfall plot. But there's a nice design using them in d'Apollito configuration, it's called AD828. If you want construction plans, send me an email.

So it's hard to tell if this driver is good for 2-way design.

Robo

[Lionel]

I found that :
HM210Z12
Perhaps it could be helpful for a start.

good luck.

[ezkcdude]

Hello, everyone. I'm new to this board. Several years ago (1998?), I used that Aerogel 8" driver with a Focal inverted titanium dome (TC90 something or other), and it made a very fine combination. I bought both drivers from Madisound, although I see they don't carry Focal anymore. They also designed the crossover using the LEAP software. Anyway, I really loved those speakers, but they are now sitting in my dad's house. I built a smaller set of speakers using the same tweeter (love that Focal sound) and Scan-Speak 7" kevlar (18W/8546) woofers, which also sound great. One of these days, I'm going to build a three-way using all three of these drivers, if they can still be found, of course.

[Dick West]

ezkcdude,

Which version of that 8" driver did you use? The original HM210ZO or the later HM210Z1 or HM210Z2 versions? The original version did have a nice upper end. The later versions had a changed voice coil and spider which resulted in more bass, less upper range, and worked with a slightly smaller cabinet. Audax had been known to change T/S parameters on drivers in step with market demands.

I had 4 of the original HM210ZO drivers which were sold after replacement by the HP210Z2. The original HM drivers had a weak lower bass, the HP drivers had a better upper end, so this switch for me was a beneficial tradeoff (I am using them with a sub). Madisound had a design for the HP drivers. I was unaware of their design for the HM driver. This is all moot now as none of these drivers is now available. Audax closed out their retail sales 3 years ago.

FWIW, the best driver of the Audax Aerogels was their HM130Z0. It was a midrange used by some big name 3-way commercial designs. Its later versions (HM13OZ1 and 2) did not fare as well as they were more of a bass/mid driver (not just a midrange driver) and the midrange of them suffered in comparison to the original HM130ZO version.

Time marches on . . .

[ezkcdude]

I'm pretty sure I had the original version of the 8". I was kind of dissapointed that Audax doesn't sell those anymore. Well, at least, I'll have that one pair. I asked my dad to take some pics, and I'll post them here when he sends them to me. Dick, or anyone else listening, off the top of your head, what current drivers remind you the most of that original Aerogel? Is there anything comparable? It looks like it's hard to find any of my original drivers on Madisound, except for the Scan-Speak 7", which is still there. They don't carry Focal anymore. I really liked the sound combination of the Focal and the Aerogel. If anyone is interested, here is a pic of the DIY speakers I currently listen to with the Focal tweeter and Scan-Speak 7":

http://www2.kumc.edu/students/ezamir/diy.jpg

These are made of 3/4" MDF, 1/4" Oak plywood veneer (from Home Depot), and a two-way xover by Madisound. There's also a horizontal baffle placed between the two drivers. Each speaker weighs about 20 lbs or so.

[djiv]

Thanks for help,
What you thing for 2-way project with crossover at 2 Khz? The HM210Z12 has a phase plug. Bad or good?
Sorry for my bad english!

Will be good a this project http://www.diyaudio.gr/oldarcos.htm , but with 1 bass driver. The crossover is very complicated. What is your opinion about something like this?