New 2" (50-mm) Prototype - Page 2 - diyAudio
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Old 12th January 2010, 09:22 AM   #11
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Have you considered offering your drivers in 600 ohm versions like Phillips did 50 years
ago? If Phillips could wind a 600ohm voice coil 50 years ago how hard could it be now with better materials?
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Old 12th January 2010, 10:08 AM   #12
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Perhaps the 50mm could have a tiny frame being something along the lines of the bandors or the tiny jordans (meant to be used in a vertical array of 4 drivers).

A climbing response will off set the combing when used that way.

Here is (was) the 7ths veil "nonsuch 4" using 4 of the 50mm bandors.
/images/SeventhVeil_Nonsuch4_big.jpg

but 4 drivers times 13cm2 has about the same cone area as a 4" driver.

Norman
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Old 12th January 2010, 10:09 AM   #13
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Hi Tinitus
Errrrrr No: High sensitivity in a tiny driver and power handling is conflicting by the nature of physics. Granted lower sensitivity only offers partial control but anyone who's uses smaller higher sensitivity drivers will just how just how vulnerable they are to being over-driven.

I'm always try not to comment on other maker's drivers products, so I'll do my best to talk technical observational terms only. I'm won't comment on what I think of these driver's performance qualities on their published data.

Looking at the examples you've suggested, Tymphany's unit, its T/S have similarities to the Alpair 5. Don't be confused by their quoted power ratings. This has more to do with durability testing than actual usable power. Tangband's power rating is nearer to what could be termed as "usable" and trade's away Fo at 160Hz and Xmax @ 1-mm. None of these units gets so close to the Fo-100-Hz 90dB dream. Both these drivers, along with mine face the same laws of physics. There's no free lunch.

I know you mean well but I have been building drivers for many years now.

Mark.

Last edited by markaudio; 12th January 2010 at 10:26 AM. Reason: Adding member name
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Old 12th January 2010, 10:09 AM   #14
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Hi, since this is the manufacturers forum, not the fullrange, I feel perfectly
confortable speaking about tweeters. (Markaudio is offering a dome unit if I'm not wrong.)
In my opinion, a quality paper cone unit, with easy flange, like was the Peerless CT62H,
will be welcome from more than one, and no one is offering such a thing nowadays...
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Old 12th January 2010, 10:13 AM   #15
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Quote:
Originally Posted by woody View Post
Have you considered offering your drivers in 600 ohm versions like Phillips did 50 years
ago? If Phillips could wind a 600ohm voice coil 50 years ago how hard could it be now with better materials?
Hi Woody,
Interesting idea. I re-worked the coil on the 6.5 woofer with regard to some of your thinking. Ummmmph, would it be practical? I'll leave to others to comment more on this.

Cheers

Mark.
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Old 12th January 2010, 10:17 AM   #16
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Quote:
Originally Posted by norman bates View Post
Perhaps the 50mm could have a tiny frame being something along the lines of the bandors or the tiny jordans (meant to be used in a vertical array of 4 drivers).

A climbing response will off set the combing when used that way.

Here is (was) the 7ths veil "nonsuch 4" using 4 of the 50mm bandors.
/images/SeventhVeil_Nonsuch4_big.jpg

but 4 drivers times 13cm2 has about the same cone area as a 4" driver.

Norman
Hello Norman,
Nicely thought out.
I'm already looking into finding a square frame. But is there enough demand? ummmmph - got to earn a crust.
Cheers
Mark.
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Old 12th January 2010, 10:22 AM   #17
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Quote:
Originally Posted by Mosquito View Post
Hi, since this is the manufacturers forum, not the fullrange, I feel perfectly
confortable speaking about tweeters. (Markaudio is offering a dome unit if I'm not wrong.)
In my opinion, a quality paper cone unit, with easy flange, like was the Peerless CT62H,
will be welcome from more than one, and no one is offering such a thing nowadays...
Hi M,
Good point - well spotted! Now you can possibly guess where I may be sort of heading............... so to speak. But can I eek out more range! That's my nature.
Cheers
Mark.
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Old 12th January 2010, 10:24 AM   #18
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Guys,
I gotta go get some more driver work done. It's 7.30 P.M in HK, still much to do.

Mark
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Old 12th January 2010, 08:43 PM   #19
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Quote:
Originally Posted by tinitus View Post

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 might help too
Hi Mark
Since you commented on the least essential parts of my post, I think you may have misunderstood my intentions
Maybe I should have limited my post to the above

Anyway, isnt sensitivity very much about bandwidth, and frequency
Regarding powerhandling
Many very small dome tweeters can have quite high powerhandling
Why cant any other driver have that too
I suppose its about materials and heat transfer
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Old 12th January 2010, 09:27 PM   #20
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Quote:
Originally Posted by markaudio View Post

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.
Just as a reference, what i consider the market leader currently in this segment, has an Fs ~125 Hz and efficiency of ~86-87 dB.

dave
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