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Author Topic: NAD RP18 (Kapton version) Measurements  (Read 7728 times)

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shipsupt

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Re: NAD RP18 Bass Heavy Measurements
« Reply #10 on: March 14, 2013, 08:11:47 PM »
Thanks RD!  I was just getting ready to hit the google trail, but your explanation was WAY better!   :)p1
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Yeah, well, you know, that's just, like, your opinion, man.

gurubhai

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Re: NAD RP18 Bass Heavy Measurements
« Reply #11 on: March 14, 2013, 08:13:04 PM »
Here's the link to Wualta's original thread:
http://www.head-fi.org/t/94407/planar-obsession-old-fostex-t50

A bit of history :
The original Fostex T50 was released around 1975 in Japan. NAD RP18 is the OEM version of this headphone which was released around 1977 in German market.
North America got its first taste of this headphone in 1978 & it is this NA version that was usually referred to as T50v1 by Wualta et al in the HF ortho thread.
The 1975 version was referred to as T50v0 and their was another version around 1980 that was called the T50v2(just to be clear these terms were used by orthoheads on HF, Fostex itself refers to all three versions as just 'Fostex T50').

Minor nitpicks I know, but it is intended so that folks who follow HF ortho thread don't get confused.
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rhythmdevils

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Re: NAD RP18 Bass Heavy Measurements
« Reply #12 on: March 14, 2013, 08:19:52 PM »
I think the 1975 date should be the one remembered though, because that's when the design and materials used are dated to.  As in, this is what was possible in 1975.  I added another paragraph to my above post.
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jerg

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Re: NAD RP18 Bass Heavy Measurements
« Reply #13 on: March 14, 2013, 09:19:38 PM »
The intricacy of those diaphragm tracings put Hifiman / Audeze drivers to shame...
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HideousPride

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Re: NAD RP18 Bass Heavy Measurements
« Reply #14 on: March 14, 2013, 09:19:46 PM »
Fantastic explanation RD, was curious about these and learned a little something today.
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dBel84

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Re: NAD RP18 Bass Heavy Measurements
« Reply #15 on: March 14, 2013, 09:36:19 PM »
Quote from: jerg on March 14, 2013, 09:19:38 PM
The intricacy of those diaphragm tracings put Hifiman / Audeze drivers to shame...

don't lump hifiman and audeze in the same boat when it comes to driver design. HFM does look like a basement etch job but the LCD's have amazed me with their technical prowess when it comes to driver design, both trace density , layout and special "tricks" used to get more performance out of the drivers.

..dB
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rhythmdevils

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Re: NAD RP18 Bass Heavy Measurements
« Reply #16 on: March 14, 2013, 09:57:01 PM »
Hey Don, kudos for discovering the RP18/Hifiman pad synergy!  They sound better with the hifiman pads than with the others I'd tried previously.  Although the Jmoney Beyer pads are pretty good too.  Talk about soundstage! 
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victor25

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Re: NAD RP18 (Kapton version) Measurements
« Reply #17 on: March 14, 2013, 10:20:51 PM »
Thread is awesome  :money:, these will be hard to find now tough!  :)p2
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jerg

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Re: NAD RP18 Bass Heavy Measurements
« Reply #18 on: March 14, 2013, 10:24:02 PM »
Quote from: dBel84 on March 14, 2013, 09:36:19 PM
Quote from: jerg on March 14, 2013, 09:19:38 PM
The intricacy of those diaphragm tracings put Hifiman / Audeze drivers to shame...

don't lump hifiman and audeze in the same boat when it comes to driver design. HFM does look like a basement etch job but the LCD's have amazed me with their technical prowess when it comes to driver design, both trace density , layout and special "tricks" used to get more performance out of the drivers.

..dB

Apologies, I assumed without any basis they'd used similar methods of etching.

Are there any photos of exposed LCD2 or LCD3 diaphragms released on the Internet? The only photos are ones that have the magnet enclosures on and the tracings barely showing through the cracks.
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dBel84

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Re: NAD RP18 (Kapton version) Measurements
« Reply #19 on: March 14, 2013, 10:43:00 PM »
not sure if there are any in the wild. Traces are very thin and densely packed, especially in the original LCD2. That particular driver had staggered magnets; I never could fathom the value in doing this.
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