Orthodynamic Roundup - Page 481

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.

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.

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.

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.

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.

t30 ear-torture

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

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.

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.

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.

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.

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.

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....