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Orthodynamic Roundup - Page 481

post #7201 of 23596
Thread Starter 
Quote:
Originally Posted by DefectiveAudioComponent View Post
I'm quite sure now that the dots and disc messed with instrument separation. Now I've got to do some listening to hear if anything else went wrong.
Quote:
Originally Posted by mypasswordis View Post
I need to find a way to make my T50RP sound good and I'm pretty sure the size of the reflex dot I have on can't be good for the sound. No, wualta, I did not remove all of the stock damping film, yet. I only cut out the center rectangular holes in each side.
DAC, I wouldn't use a reflex disc on an open-back 'phone. A dot won't hurt headstage (which I assume is what you mean by "instrument separation"), but a disc might. I think you're heading in the right direction, the Euro direction, with a thin damping layer of very dense Eurofelt on the driver and a damping layer over the vents, all held tightly in place. Don't glue anything until you're sure you've got the sound you want.

MPI, just as with DAC, if you find you need to almost cover the driver with dots, something else needs attention. The dot size Smeggy's using should do the job, especially if it's under the damping layer. Undot and rethink. Remember, get the transition from bass to midrange right and worry about the rest later.

In other Fostex news, as long as we're talking about using reflection to boost treble, someday take a look at the exploded diagrams of the T20/40/50. There's an extra part in the 40 and 50 that isn't there in the 20. Smeggy pointed it out in this post.

.
post #7202 of 23596
I think I may have mentioned in the past (buried here somewhere) that there is another option for "hard" dampening. It's a breathable fabric first aid tape. Check your local drug store for the Minnesota Mining and Manufacturing "Micropore" tape.
post #7203 of 23596
Quote:
Originally Posted by JadeEast View Post
I think I may have mentioned in the past (buried here somewhere) that there is another option for "hard" dampening. It's a breathable fabric first aid tape. Check your local drug store for the Minnesota Mining and Manufacturing "Micropore" tape.
You mean that kind of fake silk, adhesive tape used in surgery? I have it somewhere, it will beinteresting to find out what it does to sound. Being adhesive (but removable later on) it might come very handy in some mods.
post #7204 of 23596
Quote:
Originally Posted by wualta View Post
(re: SR-001 Audiocats mod)

There's an electronic fix for the rolled-off treble? Did Stax intentionally band-limit the amp?
Yeah, the cheap opamp the SR-001 and the cheap caps limit the low and high extension, and make it sound more like a nice transistor radio at times

With some upgraded caps and AD8599 (uses 2 of them which are not plug and play) the SR-001 is a totally different animal. It changes from a cow to a cat, and Audiocat.
post #7205 of 23596
Quote:
Originally Posted by wualta View Post

There's an electronic fix for the rolled-off treble? Did Stax intentionally band-limit the amp?

Yes and no, they intensionally limited the headphones to reduce listening fatigue of in ear headphones. You can boost the HF in the amp and make it brighter to push the headphones to the sound you like. I like them as they are a lot. Simple EQ works nice as well. Here are the relevant specs:

S-001MK2 Earspeakers
Type: Electrostatic canal type In-The-Earspeakers, push-pull driving
Frequency Response: 20-1kHz ±2dB, 1kHz-20kHz ±4dB
Capacitance: 44pF with cable, 17pF without cable
Impedance: 360K ohms/10kHz
Sensitivity:111dB/100Vr.m.s. /1kHz
Maximum Sound Pressure level: 119dB/1kHz
Standard Bias Voltage: 580VDC
Cable: 6-core parallel/1.5m

SRM-001 Driver Unit
Frequency Response: 5-20kHz +4dB,
-3dB(10V r.m.s. output driving 1 : S-001MK2
Gain 54dB
Harmonic Distortion:
0.1% (1kHz/100V r.m.s.
output driving 1 : S-001 MK2)
Input Impedance:10k ohms
Standard Input Level: 100mV for 50V output
Maximum Output Voltage: 240V r.m.s./1kHz

If you take a look you will see that they engineered HF roll off, it does not feel that bad since the driver is in your ear The bass is actually very nice and goes deep with right fit.
post #7206 of 23596
First pass at my T30 tonight. Removed cookie of mineral wool and laid on a layer of superfelt and a cookie of 1/2" medium density open-cell foam.

Seems really bright.

Remind me what smeggyfelt is?

Foam doesn't sit right with the wires behind it. I think trimming off the extra jacket would help, but really i think the T30 drivers need to be moved to a more sympathetic enclosure.

Not sure there are any likely fosterfones, though. including the clamp, we're looking at like a 70mm piece that has to be installed in something supra-aural.

I do wonder if i could carefully bend the struts to angle the earcups more toward human anatomy than blockhead anatomy.
post #7207 of 23596
Thread Starter 
Quote:
Originally Posted by JadeEast View Post
..there is another option for "hard" dampening. Check your local drug store for [3M's] "Micropore" tape.

Have you tried it on one of our tough customers, like the T20v2 or the YH-100? Certainly worth a try.
 

Quote:
Originally Posted by HeadphoneAddict View Post
Yeah, the cheap opamp the SR-001 and the cheap caps limit the low and high extension, and make it sound more like a nice transistor radio at times.

Ow! Ouch! Oh, Stax, how could you. --I know, you got away with it in the SRD-X, but really now..

Thanks for the update, HA. That's so very very sad.
..Were they trying to save battery power, ya think?


Edited by wualta - 7/1/11 at 7:55pm
post #7208 of 23596
Quote:
Originally Posted by wualta View Post
Ow! Ouch! Oh, Stax, how could you. --I know, you got away with it in the SRD-X, but really now..

Thanks for the update, HA. That's so very very sad.
..Were they trying to save battery power, ya think?
Audiocats is the expert on these, but I'd say that's part of it.

I have a stock SR-001 and the modded one. I get about 6 hours from a pair of 1.5v AA in serial in the stock amp, and the modded amp gave me about 3 hours on a pair of 3.7v lithium 14500 cells in parallel (I haven't tested my 6 cell 14500 external battery pack, but I should get about 9 hours on a charge and it's about the size of the amp).

The modded 001 sounds fabulous and pretty close to the Livewires IEM driven by a $500 Predator or Pico. It's right up there with an SR-003 driven by the SRM-1 Mk2 Pro that has such sweet mids and highs and punchy bass with them. I understand an AD827 opamp swap in place of the stock T062 (or was that an AD825 or OP827, I forget) sounds even more marvelous.

I use my modded 001 in my bedside rig more than any other headphone amp/dynamic phone in my bedside rig, feeding my iRiver H140 into HR Micro DAC then into the SRM-001.
post #7209 of 23596

t30 ear-torture

Quote:
Originally Posted by ericj View Post
really i think the T30 drivers need to be moved to a more sympathetic enclosure.
its really puzzling how fostex managed to release a headphone this uncomfortable, and keep it on the market for so long without revisions.

i didnt want to bend the struts, unless it was a last resort, as i felt their biggest problem was the completely flat pads.
i added a foam backed pleather ring underneath the stock pads, and a big old leather sony pad on top, and the t30 is now comfortable!
sounds like i lost just a tiny bit of bass (they still have plenty though), but it was worth it, as i can now wear them for more than an hour without crying.

too bad i left them at home, and have to wait until i get back from work to play with them again.
havent got anything to do at work though, so here´s an exploded view of my current damping+pad setup

post #7210 of 23596
Quote:
Originally Posted by wualta View Post
When you had the big reflex disc and the dot/stripes on there, didn't you have treble trouble?
No. (well, a bit, there was a mysterious dip in the volume somewhere along the way to the top. I haven't done any sweep yet to see if it remains).
I thought that they sounded fine, except that the headstage was completely ruined.

Quote:
Originally Posted by wualta View Post
DAC, I wouldn't use a reflex disc on an open-back 'phone. A dot won't hurt headstage (which I assume is what you mean by "instrument separation"), but a disc might. I think you're heading in the right direction, the Euro direction, with a thin damping layer of very dense Eurofelt on the driver and a damping layer over the vents, all held tightly in place. Don't glue anything until you're sure you've got the sound you want.
Yes. This works much better. Strips (rather than just a dot) messed with headstage as well. But I still have to compare with the HD580 and the Monitor 10.

I also need to cut some thin foam into the correct shape, to make sure everything is held firmly in place.
post #7211 of 23596
Thread Starter 
Just to be clear, a reflex dot is placed directly on the magnet for two reasons, one obvious and the other not so obvious. On-magnet dots strongly reflect treble, since the sound doesn't have to pass through two thicknesses of felt as it would with an on-felt dot. Because the dot is more effective on the magnet, it doesn't have to be as large, thus futzing less with headstage and other things.

Sometimes you don't want to mess with a factory-installed damping layer and/or you don't need a lot of treble boost. This is a judgment that each modder will make on his/her own.

It would be interesting to compare a reflex ring to a reflex dot. When dealing with treble I always feel safer with a point source, but in this case it probably doesn't matter much.
post #7212 of 23596
I've cut two springy foam pucks now to keep the outer felt against the grilles and the magic felt against the driver. That should finish a good starting point for further changes.

It was worth the effort to get the headstage back on the Grundig.

Now I'm just waiting for the HP50S to finally to get something more common to compare with the Grundig.
post #7213 of 23596
I have a roll of 3m micropore tape too. Never thought of using that. I'll give it a try.

Well, I gave it a try and, niiiice. I slapped a strip over the back of the NAD drivers and it sounds very nice. I covered the whole driver and then cut back a tiny amount for venting at the end of the slots. I know it sounds an odd way to do things but it works very well. A layer of med density felt over that and it's entirely possible these will retake the crown.

Walt,
that missing upper octave is back and very sparkly. They are more 'distant' than the RP, as in, less in the head. Everything is nicely spaced and open sounding with good imaging and great clarity. Sound is well on par with the RP with that big driver relaxed effortless bass and more soundstage. Sweet indeed.
post #7214 of 23596
I also have micropore tape. What does it do to the driver?.
EDIT: I see. Maybe I should try some of it. More soundstage sounds like the exact opposite of what I got with reflex stripes.
post #7215 of 23596
Ok im gonna have to get me some of that micropore stuff...looks like the widest would be the most suitable to get a consistant layer. Looks like 3-inch is the widest. Now to find a UK source....
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