New 2" (50-mm) Prototype - diyAudio
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Old 11th January 2010, 02:35 PM   #1
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Default New 2" (50-mm) Prototype

Hi Guys,
Here's a peek at the all-new 50-mm coned prototype. Its a new generation semi-saturated paper design. The advantage of this material is the weight saving. On this proto, the net load mass for the front of the power-train is 1.2 grams.

More to come in the following days.

Have fun!

Mark.
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Old 11th January 2010, 06:11 PM   #2
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Pretty

dave
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Old 11th January 2010, 06:25 PM   #3
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Very nice - what's the intended application? - small PC speakers, line arrays
It certainly looks the part.
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Old 11th January 2010, 06:32 PM   #4
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Interesting! Maybe a 2 way full paper cone, low xover freq will be possible once again..
Some pecs?
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Old 11th January 2010, 09:18 PM   #5
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Looks like a bit heavy surround ....but I want one

How much is sensitivity ?
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Old 12th January 2010, 05:52 AM   #6
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Hi Tinitus,
Must be cold where you are!
Remember I make low mass front suspensions with wide compliance. Looks are deceiving.

Hi Mosquito,
It's early days, more experimenting to do. I'll normally trade SPL for more X-load. But on a driver this small, LF will be limited. I'm also looking harder at cost. This driver is aiming for the budget end of the market. Can a crack the price V performance barrier? I'll try hard; And I'll do my best to deliver value for money.

Cheers

Mark.
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Old 12th January 2010, 06:15 AM   #7
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by markaudio View Post
Hi Tinitus,
Must be cold where you are!

I'll normally trade SPL for more X-load.
Mark.
Coldest winter in years
But I like mr frost and snow better than cold rain

Mark, please dont try to make it into a woofer
Fs around 100hz and 90db, crossing at 1khz would make it a nice cone tweeter
Or just call it a small FAST driver, now we are in fullrange forum
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Old 12th January 2010, 07:15 AM   #8
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Tinitus,
You read my mind!

Yep, Fo @ 100Hz is the target - well done!

90dB...... arrrrgh more difficult. At 90dB, power handling will be Zilch, distortion a real danger. It needs to take at the least a 1.5 watt load, so something in the low to middle 80's is safe. Remember this is a tiny tot driver so it won't take much to power this driver no matter what amp you use.

Cheers

Mark.

Last edited by markaudio; 12th January 2010 at 07:16 AM. Reason: typo mending
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Old 12th January 2010, 07:39 AM   #9
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Actually, I should say where I trying to take this driver.

I'm thinking of making an easy to use low cost driver that can be part of various applications, OB partnering, FAST partnering, woof partnering, single desk-top, near field etc. etc. I think there's a need for this type of full range (or near full range driver) in the low end market. I know there's a fair number of cheap tiny drivers out there; But often their acoustic performance are dynamic and range restricted. I am suggesting "cheap" market here. Any thoughts on this idea guys?

It should be an experimenter's driver. A driver that can be put into weekend projects without too much fuss. It won't be the end of the world if its' re-worked into several projects, or if its damaged in the various build processes etc.

I'd suggest the Alpair 5 remains a "higher end" prime project driver. Something that the wife won't object to if it ends up in the living room.

Did any of you remember Stat Trek 1 - The first motion picture? Bones (doctor) upon leaving the the transporter room of the all-new Enterprise says to Kirk....."I bet they've moved the sick bay. I know engineers, they always love to change things" - Yep - I love this bit of the movie!

Cheers

Mark.

Last edited by markaudio; 12th January 2010 at 07:53 AM. Reason: typo mending
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Old 12th January 2010, 09:08 AM   #10
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by markaudio View Post

90dB...... arrrrgh more difficult. At 90dB, power handling will be Zilch, distortion a real danger. It needs to take at the least a 1.5 watt load, so something in the low to middle 80's is safe.
Hmm, low sensitivity kind of also goes against powerhandling, doesnt it
Higher sensitivity is a better mate to lower powerhandling, if its possible

Maybe a thicker poleplate would help?
With a narrowed thickness at gap, fore a longer overhung voicecoil

Or, thick poleplate edge/gap fore a short underhung voicecoil
And maybe neomagnet

Inside/outside winded voicecoil would help too

I guess low budget would be down the drain fast
But I wouldnt mind paying a bit more

These may be worth looking at

http://www.tb-speaker.com/detail/1230_04/w2-800sl.htm

TC9FD-18-08 | Tymphany

I dont know the Vifa, but the small Tangband sounds ok
Funny thing, I use 18ohm series resistor to get it down
And a tiny little inductor
Btw, Alex Sequerra still insist on using a cheap cone tweeter in his speakers
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