BG Neo 3 Headphone project - diyAudio
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Old 29th April 2012, 01:16 AM   #1
Remlab is offline Remlab  United States
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Default BG Neo 3 Headphone project

O.K. I found the headphones I'm going to use for the Neo 3PDR tweeters. They are amazing cans for the money. Sturdily built, two detachable cords of different lengths(11.5ft and 4ft),and two swivel points(Three if you include the fold up feature). All this for $22.00. They supposedly sound amazing. They are the Mono Prices at the bottom of this page
http://www.innerfidelity.com/content...ll-size-sealed
I'm taking the drivers out and replacing them with the neo 3 drivers. I am also removing the closed back from these cans because planar magnetic headphones sound much better that way. Planar magnetic headphones are amazingly expensive( $700.00 up to $2,000). If this experiment works, they can be had for under $200.00. If they sound good enough to my ears, I'll send them to Tyll Herstens for a full battery of dummy head measurements which he then posts on his site in the DIY section..
Here's another article on the Mono Price;
http://www.head-fi.org/products/mono...hp-839/reviews
(The product# is different but the product is the same)
Seth

Last edited by Remlab; 29th April 2012 at 01:41 AM.
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Old 29th April 2012, 11:25 AM   #2
Remlab is offline Remlab  United States
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Quote:
Originally Posted by Remlab View Post
O.K. I found the headphones I'm going to use for the Neo 3PDR tweeters. They are amazing cans for the money. Sturdily built, two detachable cords of different lengths(11.5ft and 4ft),and two swivel points(Three if you include the fold up feature). All this for $22.00. They supposedly sound amazing. They are the Mono Prices at the bottom of this page
InnerFidelity's "Wall of Fame" Full-Size Sealed | InnerFidelity
I'm taking the drivers out and replacing them with the neo 3 drivers. I am also removing the closed back from these cans because planar magnetic headphones sound much better that way. Planar magnetic headphones are amazingly expensive( $700.00 up to $2,000). If this experiment works, they can be had for under $200.00. If they sound good enough to my ears, I'll send them to Tyll Herstens for a full battery of dummy head measurements which he then posts on his site in the DIY section..
Here's another article on the Mono Price;
Monoprice MHP-839 Reviews
(The product# is different but the product is the same)
Seth
I tested these BG tweeters a few weeks ago in a very crude, totally sealed enclosure with roughly the same volume and absorption(more absorption than normal)as typical headphones. I completely sealed it off with putty so there was no air leakage.
The frequency response was shocking to say the least. The response was ruler flat from 40hz to 700hz. No wiggle. No anything. Just a flat line. Above that, frequency response measurements are not reliable without a headphone dummy head and an HRTF filter. The intriguing thing though, is that a driver designed as a tweeter can do that at all! This is what got me started on this crazy project/experiment..

Last edited by Remlab; 29th April 2012 at 11:34 AM.
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Old 29th April 2012, 10:33 PM   #3
Remlab is offline Remlab  United States
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This was taken from a different thread..

Quote:
Originally Posted by Toaster

Remlab, even used at low levels as earspeakers, surely the high fs of the Neo 3s will make them unsuitable for full range use?
Toaster

The Neo 3 has no fs. For proof of this, look at the impedance trace on the Zaph website. Perfectly resistive(Flat) to the upper and lower limits of the graph. This is why planar magnetic tweeters can be used as headphone diaphrams, and conventional tweeters obviously cannot.
Seth

Last edited by Remlab; 29th April 2012 at 10:39 PM.
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Old 29th April 2012, 10:57 PM   #4
Remlab is offline Remlab  United States
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Look at the impedance curves on both of these graphs. The Hd 800 headphones are widely regarded as the worlds best. The HiFiman HE500 planar magnetic Phones are considered one of the best..

http://www.innerfidelity.com/images/SennheiserHD800.pdf

http://www.innerfidelity.com/images/HiFiMANHE500.pdf

Note that the HD 800 has a huge impedance peak centered at 100hz. The HiFiman is perfectly resistive. This is why planar magnetic transducers make ideal headphone drivers..

Last edited by Remlab; 29th April 2012 at 11:20 PM.
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Old 29th April 2012, 11:11 PM   #5
Remlab is offline Remlab  United States
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Incredibly informative planar magnetic headphone article with an excellent Youtube video at the end..
How Planar Magnetic Headphones Work | InnerFidelity

This article and video (with links at the end), provides an excellent explanation of planar magnetic transducer technology.
Seth

Last edited by Remlab; 29th April 2012 at 11:27 PM.
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Old 30th April 2012, 01:26 AM   #6
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Seth,

I have a pair of neo3 floating around that I was gonna put in my car, but this project really has me excited! Looking forward to more information and pictures.

Do you have the monoprice headphones yet? I have a pretty narrow head and a lot of times large headphones do not fit well.

Greg
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Old 30th April 2012, 01:37 AM   #7
Remlab is offline Remlab  United States
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I must state that when It's all said and done, they may sound good, or they may sound like crap. That's why I'm investing as little as possible in this project. What happens above 700hz is extremely critical for good performance, regardless of what happens below that point...
Seth

Last edited by Remlab; 30th April 2012 at 01:47 AM.
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Old 30th April 2012, 02:06 AM   #8
Remlab is offline Remlab  United States
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Quote:
Originally Posted by studiotech View Post
Seth,

I have a pair of neo3 floating around that I was gonna put in my car, but this project really has me excited! Looking forward to more information and pictures.

Do you have the monoprice headphones yet? I have a pretty narrow head and a lot of times large headphones do not fit well.

Greg
My head is pretty narrow also. I'll let you when I get them on Tuesday.
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Old 30th April 2012, 02:11 AM   #9
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Quote:
Originally Posted by Remlab View Post
My head is pretty narrow also. I'll let you when I get them on Tuesday.
LOL! Perfect! Maybe us "pencilheads" have something predisposed to like planar drivers...

Greg
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Old 30th April 2012, 02:13 AM   #10
Remlab is offline Remlab  United States
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I have the Neo 3PDR's. If they are too subdued in the highs because of their inherent design characteristics, someone with the regular Neo 3's could be of help with this experiment..
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