CHS40 and CHS50 early developments - diyAudio
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Old 30th August 2014, 03:20 PM   #1
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Default CHS40 and CHS50 early developments

Hello Chaps,
Some pics for you of new drivers I'm hoping to develop during the rest of the year. With your feedback and allot of support from Evan Yu (bless him).

CHS40 - note the new GF30 frame, 40mm dia., cone on a 14.5mm dia. coil/power train (might change as I tweak). Not sure on the throw yet, around a 4.4mm col winding. Driver will likely be a 2 suspension unit. You can see the rear suspension under development in the pic. F zero is projected to be 200Hz.

CHS50 - similar to CHS40 but with 50mm dia. cone and a 16mm dia.coil/power-train.
Its F zero is project to be around 140Hz.

Both drivers are being designed for wide dispersion as supplementary high-range output units (cone wide band tweeters if you like). Or for desk-top near-field applications.

Some way to go be, at least you all know my brain is still ticking on.

Cheers
Mark.
Attached Images
File Type: jpg chs40.jpg (91.0 KB, 484 views)
File Type: jpg chs50-1.jpg (95.8 KB, 461 views)

Last edited by markaudio; 30th August 2014 at 03:29 PM.
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Old 30th August 2014, 04:34 PM   #2
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Hello Mark,
This could be good news! I have been looking for a mid/tweeter to replace the Peerless MTR-25 and CT62H drivers that are very hard to find,now (8 ohms).
Keep up the good work,Mark.

Last edited by Cambe; 30th August 2014 at 04:36 PM. Reason: Spelling
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Old 30th August 2014, 04:57 PM   #3
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Always great to see any type of new drivers from you Mark! Either unit has got my vote. Great for FAST systems!

You wouldn't want to make a mid driver for diy domestic synergy horns would you? ;P

Cheers
Dean.
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Old 30th August 2014, 09:36 PM   #4
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Sounds promising to me. There is a dearth of quality cone tweeters out there, so a couple of new ones would be very welcome.
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Old 30th August 2014, 09:55 PM   #5
chrisb is offline chrisb  Canada
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Yes, I fondly remember the short lived Alpair 5 - with your R&D since then, new offerings in the 1.5 - 2" range could be very interesting.

MTM with CHBW70 could be lots o' fun.
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Old 11th September 2014, 11:16 AM   #6
AndrewR is offline AndrewR  United Kingdom
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Hi Mark and all,

Just contributing as a result of my enquiry about drivers suitable for open-baffle. The CHS50 is of interest. Hence I have loads of questions (sorry).

The original Alpair 5 was a spiderless design. Did that have advantages from an open-baffle perspective from a standpoint of reducing reflections? Did it also contribute to the desirable high Qts of 0.74? Can this be implemented or did I read it correctly that the EU restricted the use of ferrofluid?

Are you aiming for a 0.74 Qts?

A high Qts should be great and help deliver good bass output despite the high F0.

Looking forward to something magical. Any rough timeframe on availability? 6 months or a year? Would an Alpair 7 Grey in an open baffle tide me over?

Thank you,

Andrew
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Old 11th September 2014, 11:18 AM   #7
AndrewR is offline AndrewR  United Kingdom
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One other though. Is it possible to design a driver with interchangeable magnets (e.g. screw-in) for modular upgrades to other magnet technologies (e.g. Alnico and Neodymium)?

Andrew
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Old 11th September 2014, 01:49 PM   #8
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Quote:
Originally Posted by AndrewR View Post
Hi Mark and all,

Just contributing as a result of my enquiry about drivers suitable for open-baffle. The CHS50 is of interest. Hence I have loads of questions (sorry).

The original Alpair 5 was a spiderless design. Did that have advantages from an open-baffle perspective from a standpoint of reducing reflections? Did it also contribute to the desirable high Qts of 0.74? Can this be implemented or did I read it correctly that the EU restricted the use of ferrofluid?

Are you aiming for a 0.74 Qts? A high Qts should be great and help deliver good bass output despite the high F0.

Looking forward to something magical. Any rough timeframe on availability? 6 months or a year? Would an Alpair 7 Grey in an open baffle tide me over?

Thank you,

Andrew
Hello Andrew,
Thanks for your interest. Answering:

The original Alp5 suspension design wouldn't normally favour OB, as this design was intended for closed or ported boxes where the back pressure generated acts as a stabilising force on the power-train. I know from Japan feedback that the early drivers underwent allot of OB experimentation on amp matching to compensate for the lack of environmental damping. Hence the successful application seen in the Youtube video. Its an illustration of the Alp5's efficient electro-mechanical conversion process within its power-train where the coil is free from fixed mechanical suspension effort. However, since Matsubara san (Father FE series designer) has joined us, his spider designs have moved Markaudio drivers along way forward. We likely will use his latest spider designs as they offer increased linearity compared to earlier designs, more likely suitable for OB.

High Total Q isn't a specific priority. While your idea has an interest for single point designs, these series of drivers must have a balanced design approach where they can also partner with larger units.

Time-frame I hope will be within 3 months to final pre-production.

Alp7M (or P) should be an interesting OB application.

Thanks
Mark.
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Old 11th September 2014, 10:41 PM   #9
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Hey Mark,

These drivers sound very interesting! Could likely make for a stellar low crossover / "Fast" 2 way design.

I'm actually in the processes of designing a 3 way open baffle using the 7m/p on top, a yet to be determined mid-bass and a pair of rather large "atmosphere generators" on the bottom. Perhaps the 12p-woofer is the ticket for the mid-bass! I'll have to get my hands on a pair in the near future for testing.
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Old 12th September 2014, 05:41 AM   #10
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Quote:
Originally Posted by Robertburchell View Post
Hey Mark,

These drivers sound very interesting! Could likely make for a stellar low crossover / "Fast" 2 way design.

I'm actually in the processes of designing a 3 way open baffle using the 7m/p on top, a yet to be determined mid-bass and a pair of rather large "atmosphere generators" on the bottom. Perhaps the 12p-woofer is the ticket for the mid-bass! I'll have to get my hands on a pair in the near future for testing.
Hello Robert,
Good to hear from you. Did you receive my email (sent a day back)? Its worth considering the 12PW. Some have already emailed me suggesting CHS40 + Alpair 7 (or CHS70) + Alpair 12PW; a mix of paper and metal but cone profiles are similar. Not sure how it would work out but certainly could be interesting.

There's several requests in for a paper cone version of the CHS40. But I'm not sure if I can extract a bucket load of extreme HF as yet.

Thanks
Mark.
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