ludoo

Don't limit yourself to a full disc of felt. Sometimes what you need is a disc smaller than the driver, or a donut shape. If you think they might need more damping but the thick felt chokes them, try using it with less surface area.

Thanks, and sorry for the OT.

Same here, CP is set to forward notifications, and zero messages in the Spam folders. BTW if you need a skilled Linux/Unix sysadmin just ask. Edit: checked my CP, and I had PM notifications turned off; weird, but I guess it's my fault I did not get any...

My YH-1 don't go that low, but then neither did my YH-100. BTW, will mods kill me/make me listen to ibuds if I posted something in the FS forum? Edit: and BTW2, why is it that I almost never get alert emails from HC? and also, as soon as it stops raining (rain is the enemy for us cyclists) I will go and get the group buy felt. Hope all of you are still interested or I'll have to make me a nice expensive coat with small v. expensive squares of cashmere.

Oh wow, we really needed a third ortho thread to keep track of. As for felts, what I think makes it good for our purposes (and here I may repeat something wualta has already said) is that it has incredible density, while still allowing air to pass. And in my limited experience (about 20-30 different types of fabrics/felts) I'm pretty convinced that natural fibers are better at absorbing energy than shiny synthetic fibers, which might be why kabeer's fake silk does nothing much to bass. One other thing to note is that placement has as much to do with the damping results as the kind of material you are using. We basically have three "damping zones", each one with different effects: the driver itself; the vents (if any); the inside surface of the cups (and baffle, maybe). While the first two are similar in that they trap air pressure, and just offer different effectiveness (the nearer the felt to the driver, the larger its effect), damping the inside surface of the cups just kills reflections. Two different things, which sometimes might be combined as in the "standard" bass heavy HP-3 mod which uses a very thick disc of felt (smeggy's felt) to both damp the back of the earcups and the vents. A second, finer kind of placement is where you apply damping on the drivers: we found out with kabeer that by varying the damping density on different areas of the driver, you can roughly select which frequencies you damp. So by making donuts, or a combination of donuts and discs, you can for example raise the treble without killing off too much deep bass, using felt instead of a reflex disc/dot. My experience with the Yamaha I have/had and with the T20v2 is that usually you need a dense, thin layer pressed against the driver (kept in place with foam in the HP50, smeggy's felt acting also as a spring in the hp3, the driver assembly in the t20v2), and another, usually lighter layer (or two) for the vents and cups. Then it's a matter of finding a balance between vent damping and driver damping.

Still waiting for the damn post to deliver the smeggyfied YH-1. Damn...

I always knew you were the best.

Poor Pro30s

I spent half a day today with my "basement setup", the T20 and my small Yaha, and I was surprised at how good they sound after having ignored them for a while. Fostexes have a lot going for them, once they are properly damped.

As that other site is always unavailable, I'll regale you with my straight ticket to the special hell for noobs who mangle good projects: my half scale version of the Cyburgs Needles, using the 120ohm SFI. Cardboard, three old wool socks for internal damping, lots of hot glue. Sound, as expected, is not particularly impressive but could be worse and is much better than many pc speakers I heard: lowish volume from the Starving Student, little bass (though the little there is goes quite deep), maybe a bit too much treble. Now I'll have to pester the dyiaudio guys to design proper half scale needles, as they are the perfect size for my desk.

If everything goes according to plan, there may be one I'll send on tour shortly. The first stops will be you and Donald. Bah, I came hope expecting to see the YH-1 package, but no luck yet. Waiting is so hard...

...or you miss the special felts in the HP-3.

Yay! HP/YH-3 FTW!

Been lurking for a while, then had to join to hold up the Yama flag. Heh, you are a rocker so subtle nuances are lost on you. As for the felt, don't worry I'll send you a piece, it's the least I can do. BTW I can't wait for the YH-1 you modded to arrive, as I think I'll love them.

So that's why the "other thread" has been silent.... Ok, for those of you who did not read about it there, if you are still interested in the cashmere felt group by, drop me a note. I'll probably go get it on Saturday. And, I don't really believe the T50rp are better than the Yamas, smeggy!