CHR-70 GENERATION 3 - COMING SOON - Page 24 - diyAudio
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Old 5th June 2011, 05:59 PM   #231
EUVL is offline EUVL  Europe
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Old 15th June 2011, 04:52 PM   #232
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Hi Fellas,
Here's the final mass production data for the CHR-70 Gen.3's.
This is the first time I've make a lower cost Markaudio driver (aside the EL70) that gets to 25-kHz. Overall, its a nicely improved driver over the Gen. 2.

The output from the power-train is a significant improvement. I've managed to move the peak up to HF range so its well outside the most sensitive parts of the spectrum. This driver's Fo is lower (65Hz) while maintaining a total Q of 0.55. Try your winzip and other software, you'll get a nice box design for this CHR. You're getting even more "bang for your bucks" so to speak.

Technical improvements are:
1 - stiffer frame.
2 - new cap design with new improved fitting method.
3 - new Japanese designed coil.
4 - new spider for improved bass (3060).
5 -2 colour choice (champagne gold and and brush look metal cones)

Take a look at the data, I'll post more later and make information PDF's soonest possible.

Cheers

Mark.

CHR-70 Gen.3 Data
REVC 7.2 Ohm
Fo 65.40 Hz
Sd 5.02 K mm/2
Vas 5.17 Ltrs
Cms 1.44 uM/N
Mmd 3.90 g
Mms 4.10 g
BL 4.20 G/cm
Qms 2.66
Qes 0.69
Qts 0.55
Levc 32.44 uH
No 0.20%
Spl 85.4 dB
Pwr 20w Nom.
X max 4-mm 1 way
Coil Dia 20-mm
Main tolerance +/- 2.5 hz on mean Fo
Attached Images
File Type: jpg CHR-70-gen3-fr-june2011-sml.jpg (157.5 KB, 237 views)
File Type: jpg CHR-70-gen3-fr0_15_30-june2011-smla.jpg (172.2 KB, 233 views)
File Type: jpg CHR-70-gen3-imp-june2011-sml.jpg (168.3 KB, 218 views)

Last edited by markaudio; 15th June 2011 at 04:59 PM. Reason: typo fix
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Old 15th June 2011, 04:55 PM   #233
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Hi Fellas,
Here's the pics:
Cheers
Mark.
Attached Images
File Type: jpg CHR-70-Gen.3-chamagne-sml.jpg (97.7 KB, 216 views)
File Type: jpg CHR-70-Gen.3-metal-sml.jpg (94.7 KB, 217 views)
File Type: jpg CHR-70-Gen.3-champ-metal-1-sml.jpg (94.9 KB, 67 views)
File Type: jpg CHR-70-Gen.3-champ-metal-2-sml.jpg (101.4 KB, 64 views)
File Type: jpg CHR-70-Gen.3-champagne-box-sml.jpg (130.1 KB, 65 views)
File Type: jpg CHR-70-Gen.3-metal-box-sml.jpg (138.3 KB, 50 views)
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Old 15th June 2011, 04:58 PM   #234
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Looks awesome and I hope it will sound awesome as well. Sign me up for three (r/c/l) as soon as they hit the US. Thanks for all of your sharing Mark.
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Old 15th June 2011, 05:00 PM   #235
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Beautiful, sir! Is it just me, or has the pressure to increase impedance and SPL reduced the amount of built in BSC, or even eliminated it?

...And will you be posting info on the CHP-70 anytime soon?
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Old 15th June 2011, 05:01 PM   #236
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Thanks Mark, new CHR-70 looking good.

Anything on the new CHP-70?

-Zia
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Old 15th June 2011, 05:13 PM   #237
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Quote:
Originally Posted by chazdrumzalot View Post
Beautiful, sir! Is it just me, or has the pressure to increase impedance and SPL reduced the amount of built in BSC, or even eliminated it?
...And will you be posting info on the CHP-70 anytime soon?
Hi Chaz
A little less so. The correction is now wider. I've spent more time flattening out much of the frequency range. Reason being the total range has increased by some 15%, thus I needed to increase stability in the power-train (lots of late nights working on this design challenge).

With 65Hz and a total Q of .55, you'll get nice bass so in most box designs, no need for any correction.

About to post CHP results.

Cheers
Mark.
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Old 15th June 2011, 05:15 PM   #238
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Quote:
Originally Posted by chazdrumzalot View Post
Beautiful, sir! Is it just me, or has the pressure to increase impedance and SPL reduced the amount of built in BSC, or even eliminated it?
It's still there to an extent although the balance has clearly shifted toward something more akin to the Alpairs. It's a broader band lift this time, if slightly shallower, so it may end up being more effective than previously. The off-axis behaviour appears to be stable, with a gentle HF roll-off, which should help.

Quote:
...And will you be posting info on the CHP-70 anytime soon?
I suspect a case of watch this space over the next day or so.

Last edited by Scottmoose; 15th June 2011 at 05:20 PM.
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Old 15th June 2011, 09:43 PM   #239
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Hi Mark, I want to use these in a TL but because of the high qts and good bass response I am not sure what length line- close to Fs as normal or much lower?
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Old 15th June 2011, 10:16 PM   #240
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Quote:
Originally Posted by Bill poster View Post
close to Fs as normal or much lower?
Rarely a good idea to tune any TL to below Fs.

dave
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