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Orthodynamic Roundup - Page 1416

post #21226 of 23576

Now: sit down, take a breath, grab scissors, felt, and a microphone, and mod them.

post #21227 of 23576

You might find the bass a little loose after a bit of listening time, tighten that up  with some damping materials and you'll be good to go, it should get even better than what you are hearing now!  Get used to them first.  Ask any sort of questions here about all that too, how to get into them , etc.

post #21228 of 23576
Def for right now I like how they sound, ill evaluate them for a bit in stock form. Tho typically i dont mod unless i have a second pair, not only for direct a/bing bit also if i f up i have a back up.
The only question I have is the leather in runner the plastic frame near the point where it mounts to the main frame is broken, left rear and right front. Is the leather strong until I can get some leather or sheepskin and try to make a pad? Also is there a good jack adapter for using these with either directly with the iPhone or the e11? I got one from radio shack during lunch eager to try these, and it sucks, the one that came with my akg k701 sucks too, sometimes you have to wiggle the dumb thing to get both channels right.(verified its the adaptor and not the headphones).
Edited by droido256 - 3/2/13 at 3:38am
post #21229 of 23576

^ Microphone and response plots for comparing mod progress.

 

On a similar note, I looked through a lot of the gallery for this thread a few days ago, and saw very few response plots. Made me sad. Also saw a cosmetics ad, and a guy who had shaved only half of his face.

 

And I'm pretty sure I saw some outright, literal porn images in this thread some months back when I was browsing through the older pages.

post #21230 of 23576
Quote:
Originally Posted by vid View Post

^ Microphone and response plots for comparing mod progress.

 

On a similar note, I looked through a lot of the gallery for this thread a few days ago, and saw very few response plots. Made me sad. Also saw a cosmetics ad, and a guy who had shaved only half of his face.

 

And I'm pretty sure I saw some outright, literal porn images in this thread some months back when I was browsing through the older pages.


and what does this tell us about response plots? :-)

 

btw, I would like to take some measurements myself but I miss the necessary equipment.

post #21231 of 23576
Quote:
Originally Posted by vid View Post

^ Microphone and response plots for comparing mod progress.

 

On a similar note, I looked through a lot of the gallery for this thread a few days ago, and saw very few response plots. Made me sad. Also saw a cosmetics ad, and a guy who had shaved only half of his face.

 

And I'm pretty sure I saw some outright, literal porn images in this thread some months back when I was browsing through the older pages.

All those naked drivers *drool*.....tongue.gif

post #21232 of 23576

Taking measurements where the idea is to compare one to another (say, one mod to another slightly different mod) doesn't require calibrated microphones or anything else fancy. And as for CSD plots, I've done some experimental measurements where I literally dangled the microphone in front of an open baffle and still got results comparable to those from more careful measurements (i.e. the spots of ringing showed up in both measurements). Though generating the CSD plots from the measurement data is more tricky, since there's no free software as such.

 

And I'm not kidding about the porn. I'm pretty sure it was this thread - somewhere on those ancient pages was a post with very graphic nudity. But the other images in this thread are pretty cool nonetheless.


Edited by vid - 3/2/13 at 2:19pm
post #21233 of 23576

There has occasionally been some very questionable stuff in the "headphones worn" thread which were quickly removed. However, if the pictures were uploaded to the headfi servers then you can still trawl through the gallery folders and find them.

post #21234 of 23576

Looked through the gallery and the first 600 pages of the thread, but didn't find the porno. I remember no one having commented on the images in the following posts, so I suspect it was a later issue with wherever the pictures were hosted.

 

But I did see yoginasser's girlfriend in a bra, and an SFI with somewhat similarly misaligned magnets as in GREQ's Watson.

 

http://www.head-fi.org/t/111193/orthodynamic-roundup/8295#post_5430020 (that's the SFI).

post #21235 of 23576
Quote:
Originally Posted by droido256 View Post

Def for right now I like how they sound, ill evaluate them for a bit in stock form. Tho typically i dont mod unless i have a second pair, not only for direct a/bing bit also if i f up i have a back up.
The only question I have is the leather in runner the plastic frame near the point where it mounts to the main frame is broken, left rear and right front. Is the leather strong until I can get some leather or sheepskin and try to make a pad? Also is there a good jack adapter for using these with either directly with the iPhone or the e11? I got one from radio shack during lunch eager to try these, and it sucks, the one that came with my akg k701 sucks too, sometimes you have to wiggle the dumb thing to get both channels right.(verified its the adaptor and not the headphones).

The headband there is not in leather, but cloth with suede liken texture.

It's usually strong enough; the plastic rim on my HP-2 was broken on all four sides (weight entirely held by slightly torn cloth) but still hold well.

 

If you're trying to make your own leather earpads, you can try. Otherwise some of those (non OEM) Sony replacement pads on ebay do pretty well, granted the adequate size. In the case of the HP-2, you're in luck as they are pretty decent replacement. Just double check the dimensions.

 

Good jack adapters are probably along the lines of the Sennheiser or Grado ones. They have a bit of cable to it.

I'm sure there are others but I don't have as many choices here so I went for the Grado one, works splendid.

The only thing is that the Grado 1/8" plug is pretty fat itself; if your iPhone is in a full case (versus back cover) then it won't fit.

For that you can buy a short 1/8" female to 1/8"male cable (often a cellphone accessory) and trim off a bit of the plastic-rubber on the male end of the cable. Why not do the same on the Grado connector itself? why... cause it's more expensive and prettier looking!

post #21236 of 23576

Another benefit of a microphone (there's more!) is that it helps you get a 99.9% perfect channel balance. Measure the response of both channels in exactly the same way (doesn't need to be a perceptually accurate measurement, but probably want to create a seal for the microphone on the baffle), take the channels' relative difference, create a stereo impulse response of the difference so that the other channel gets a flat response and the other one the relative difference, then load the impulse response into a stereo convolver plugin for foobar or whatever.

 

I use this on my HP-50S that had mismatched drivers - results in some immaculate imaging. Works with the full-sized DT 990, too, with equal gusto.


Edited by vid - 3/2/13 at 8:00pm
post #21237 of 23576
Oh that's good to know the cloth is strong ^_^. Luckily the ear pads on these are still excellent but good to know I have options ^_^ ill give grado a check on the adapter smily_headphones1.gif thank you ^_^
Luckily my E11 patch cable fits in my battery case with no problems, there's no long term direct driving these with the iPhone, they're easier to drive than the k701, but still that's really taxing the iPhone amp, also I don't know how well the planar driver handles amp distortion. So I play it safe smily_headphones1.gif
Edited by droido256 - 3/2/13 at 8:18pm
post #21238 of 23576

There is REW and ARTA which can do waterfall as well as spectogram. 

http://www.head-fi.org/t/618659/fostex-t50rp-incremental-mods-and-measurements

 

Quote:
Originally Posted by vid View Post

Though generating the CSD plots from the measurement data is more tricky, since there's no free software as such.

post #21239 of 23576
Quote:
Originally Posted by Hutnicks View Post

Is the t 20 a different driver?
 

 

Quote:
Originally Posted by Hutnicks View Post

Hmmm. Curiouser and curiouser, wonder why no mad dog T20 mods then?  This may require me dealing off some Senni's to fund a T20 experiment. Time to cruise the Thievesbay methinks.
 

 

Quote:
Originally Posted by Armaegis View Post

Because the T50 is the most expensive, and thus the "best". 

     

Quote:
Originally Posted by nick n View Post

I know that some people in here have achieved seriously good results with modding the new T20 ,almost , if not completely indistinguishable from the modded T50 results .

They can check in here I'm not going to put them on the spot, or you can ask in the T50 Incremental Mods thread about that bigsmile_face.gif

 

Quote:

Originally Posted by nick n View Post
 

ask in here for sure, I betcha you'll get some reassurance.

http://www.head-fi.org/t/618659/fostex-t50rp-incremental-mods-and-measurements

 

 

I don't see any differences between the  T20-40-50RP series except for the damping:
 
1. T50RP          =  Stiff black felt over the internal lower cup vents allows limited venting 
                            A plastic cap seals the central headband screw compartment
 
2. T40RP mk II =   A rectangle of plastic seals the internal lower cup vents allows no venting
                            A plastic cap covers the central headband screw compartment but has a ~ 4 mm hole in the center
 
3. T20RP mk II =   A more "open" or porous plastic grid material over the internal lower cup vents allows for more venting than T50RP
                            No cap over the central headband screw compartment
 
So, Damping/Resistance from greatest to least: T40RP mk II > T50RP > T20RP mk II
 
Equivalent SQ and FR is possible from all three with a few simple modifications to compensate for different damping schemes/resistance from model to model. You could try these reversible additions to your preferred mod configuration:
 
1. For T40RP mk II + Cover the hole in the central headband screw compartment cap with tape 
                                Remove the plastic rectangle covering the internal lower cup vents
                                Use rubber cement to secure a rectangle of craft felt over the lower internal cup vents.
 
2. For T20RP mk II + Cover the central headband screw compartment with tape
                                Cover the plastic mesh overlaying the internal cup vents with thin craft felt
                                
 
I wonder if the power rating (2 watts vs 3 watts) has to do with the differences in damping schemes/resistance of the 3 "different" models? But wait. T20/40RP mk II are rated at 2 watts. T20RP mk II has porous mesh over the vents and no cap vs T40RP mk II has sealed vents and a 4 mm hole in the cap vs T50RP has semi-porous felt over the vents and sealed caps. Could the cap configuration be partially responsible for the power ratings??
 
BTW, a couple of months ago the price difference between T20RP mk II and T50RP was ~$50.00. Now it's only $10 --> $89.00 for T20/40RP mk II and $99.00 for T50RP.
 
Also, just noticed that T20RP mk II and T40RP mk II now have cushioned headbands. There was no mention of this for T50RP at bhphotovideo.
 
 
T20RP mk II:
 
Type Circum-aural, semi-open
Frequency Range 20 Hz - 30 kHz
Impedance 50 ohms
Sensitivity 96dB SPL/mW
Maximum Input Power 200 mW
Connectors 1/4" TRS phone
Cable Length 10' (3 m)
Weight 11.6 oz (328.9 g)

 

 

T40RP mk II:

 

 

 
 

Specifications

Type Circum-aural, semi-open
Frequency Range 20Hz to 25kHz
Impedance 50 ohms
Sensitivity 93dB SPL/mW
Maximum Input Power 200 mW
Connectors 1/4" TRS phone
Cable Length 10' (3 m)
Weight 11.6 oz (328.9 g)

 

T50RP:

 

Specifications   

Type Circumaural Semi-Open RP Dynamic Stereo Headphones
Frequency Range 15 Hz - 35 kHz
Impedance 50 Ohm
Sensitivity 98 dB/mW
Maximum Input Power 3000 mW
Connectors Detachable 1/4" Stereo Phone Plug
1/8" Stereo Mini Plug
Cable Length 10' (3 m)
Weight 11.6 oz (330 g)
post #21240 of 23576

Cushioned headbands? That's the first I've heard of this... 

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