Quote:




Quote:



Actually I have one in near mint condition from my HP-1's I used for the Chocolate Donuts. Whoever is in need of it PM me about it. I actually have everything from the HP-1 except the drivers and baffles, and it's all in fantastic shape including the pads. I should've thought to mention this earlier, as I'm sure one of you could use these.

Hey guys whatever happened to Inkmo? Haven't seen him around here in quite a while.

Well, here's the most recent revision of my YH-100 transplant.
First some info on the transplant and modification:

• The fosterphones are the MB Quart QP55x headphones. These have a 56mm driver so the transplant was almost perfect. I sealed the outside edges with blu-tak to ensure the best fit.
• Since the QP55x is a semi-open baffle, I took the liberty of completely sealing it with blu-tak. The semi-rigid properties and pliability made it ideal.
• The stock damping on the QP55x made the sound tinny and sucked out the bass so I did minor tweaks. I took out the original damping disk and put in some cheap cotton felt. This gave a slight increase in the lower bass range.
• There are three pads I rotate on with the QP55x, each of varying thicknesses. The thickest are the stock QP55x/Beyerdynamic velour pads. The thinnest are some flat pleather pads off some old Aiwa headphones; these are circumaural but are now so flat they are supra aural. The pads almost perfectly in between these thicknesses are the Accura SR-660 velour pads. The ones you will see are the ones I enjoy the most with the YH-100 drivers (the Accura SR-660 pads).
• Due to the increased weight of the drivers, the headphones were very finicky when it came to moving around. To solve this, I swapped the stock headband for the headband off the YH-100. It took minor modding but it looks natural and took minimal hardware to adapt to headband to the new phones.

Look! It even says orthodynamic headphones on the band now!

Nice job on the transplant Foo. It looks like it came from the factory that way. What do the original 55x drivers look like, out of curiousity?

Quote:



This is a good idea. You could feather the sharp edges with hot glue.

Maybe long strips of the blisterpack plastic glued down on top of the broken strip with cyanoacrylate glue?




Quote:



Whoa! Leaving no stone unturned!


Quote:



Did you happen to listen to it before you peeled?


Quote:



This was the problem with the original DonutPhones. We were stuck with a driver that didn't have the low tuning to help the bass when the earcup volume went way up.

Yeah, try heavy damping on the open back, check for leaks, undamp the driver (oh, I hate to do that) to drop the resonant frequency and maybe just use a big chunk of opencell foam (not fishfoam) instead, take off the reflex dot (hate to do that too, but spacing the driver away from the ear, which the UR40 does slightly, has a similar effect), get flatter pads, fill some of the earcup volume with closed-cell foam, turn up the bass, use a burly amp with extra burl, dip the terrycloth pads in that liquid soft-grip stuff you put on tool handles (or just cover the outside surface, like the tape mod for the K501 pads), pray for bass, hypnotize yourself into believing you're hearing a 20Hz sine wave at 110dB SPL, curse your luck.

That's what I do.

Believe it or not, the little YHD-2 driver, being of the "dome" type, didn't have a bass problem in the UR40. Maybe not a basshead 'phone, but not bad.

.

Great job on the YH-10055x-- very clever to use the original headband.

Test 'em with bass boost and binaural recordings.

Did you ever try lining the back of the open cup with felt rather than the red foam?

Quote:



No, I haven't lined the back of the cup yet. I'm going to listen to them for a while before I decide on any more damping. I still can't really tell what's missing from the sound, and that's if there is anything missing at all.

Also, I don't really like using bass boost or EQ anymore. I figure that if I want a certain sound, I'll either use a certain set of headphones or mod what I have to fit my needs.

Quote:



I was suggesting it merely as a test of bass transient control.

Quote:



If I'm gonna cut thin strips of plastic in a perfect curve to match the original headband, I'll just make a new headband.

If the original strap weren't flared, heck yeah. I'd be all over it.

Quote:



Yeah, I'd been pondering the YUHR-42 re-pot for a while.

Quote:



No. But i have two more sets of UR-40 pleathers. I'll give 'em a try.

Quote:



This is a good point. The 20ppi fishfoam is acoustically equivalent to air, more or less.

Quote:



Heh.

I am suddenly envisioning a bizarre arrangement where i cut an oval of high density foam, cut a circle out of the middle of that - same size as the driver - and plug that with a cylinder of lower-density foam acting as a spring, but which is also wrapped with a high density felt, or maybe lined with a ring of that bizarre moldable foam i mentioned.

I'm thinking here of the little felt crown on the back of a DT770 driver.

But maybe this is all just crazy talk.

Quote:



Oh, I believe it.

Nice YH transplant !

Just wish them big Yamaha drivers are not so expensive...

Quote:



The usual student/artist struggles: http://inkmo.deviantart.com/

Quote:



You might not need 'em if the Sawafujis test out well. Remember the YHD-2 transplant! You gotta believe!

Man, my YH-550x is really really confusing to me now. I'm liking them with both the flat pads and the medium pads. Earlier the mids and highs were affected by switching to flat pads, but now the mids and highs just SING with any of the pads I use now. All that is tweaked is bass! It's freaking amazing. I'm just amazed by how the distance doesn't change anything negatively anymore and all that damping does is change the bass response.

Quote:



I like big drivers, plus I still have a set of QP housings waiting for some 53-57mm drivers to fill them....


Too bad my square SFI midranges don't have enough treble.....

Quote:



I don't have a good explanation, other than ear-education, for the change, but earpad swaps should only change the bass and lower mids. Sometimes so much bass is lost with the wrong type of pad that it may seem that the midrange and treble have changed, but.. dunno. Certainly glad to hear reports of singing. Singing headphones is never a bad thing.

Now, if the shape of the earcup cavity is changed via an earpad swap, that's something else entirely.

And damping has two effects, as we discovered earlier-- it tightens the bass and makes it more impactful, effectively increasing the bass, but it also moves the resonant frequency of the driver upward, reducing the bass.

Quote:



Will do. I didn't expect them to be so cheap but it's a good way to join another underground headphone cult...

Do you think the Corda Aria can drive them or do I need to buy/build a new amp? A nice OTL or DHT SET might just do the trick...