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Orthodynamic Roundup - Page 187

post #2791 of 18847
6/4/08 at 8:02pm
Quote:
Originally Posted by GuyMe View Post
There's only this one with the dampening stuffs: eric felt, window sealant, and a birthday card.
It's difficult to get the exact felt thickness from this picture, but I think I know now why all my mods start as severely overdamped: felt here is 4 or 5 times the thickness as the one in the picture. The only one I have approaching that thickness is not called felt around here, and is in fact the only thing that worked in the Pro30s. Luckily I sent a couple of small squares of my best felts (one thick, one the non-felt thin cloth) to smeggy, so he will be able to clear the issue in a few days.
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post #2792 of 18847
6/4/08 at 8:19pm
I'm wondering how 'memory foam' might do in some of these phones. I have some I could cut up and try, it may even serve better than felt in some regards. It's an odd material but is incredibly good at damping and is quite dense but very light. I'll have to try some in my next ortho experiment.
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post #2793 of 18847
6/4/08 at 8:22pm
Caulking ropes as good as Tak I assume right? How's this all look?

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post #2794 of 18847
6/4/08 at 8:57pm
Thread Starter 
Quote:
Originally Posted by GuyMe View Post
Every screw I took out had a split from about halfway down to the end.
That's because those are self-tapping screws. Nothing to worry about.

Quote:
Originally Posted by GuyMe
I'm either holding them upside down or I put them in that way, does foam/paper paper/foam make a difference?
Yes, in this case, since the paper is turning the felt damping disc from axial-flow to radial-flow. Sort of. So the paper has to touch the back of the felt disc.

Quote:
Originally Posted by ludoo View Post
I think I know now why all my mods start as severely overdamped: felt here is 4 or 5 times the thickness as the one in the picture. The only one I have approaching that thickness is not called felt around here, and is in fact the only thing that worked in the Pro30s.
Glad to hear you solved that mystery. Who'd've guessed we'd run up against a cultural felt difference! What is the thin felt called, if not felt?

Quote:
Originally Posted by smeggy View Post
I'm wondering how 'memory foam' might do in some of these phones. I have some I could cut up and try, it may even serve better than felt in some regards. It's an odd material but is incredibly good at damping and is quite dense but very light.
Part of the problem with most foams is 1) their density and 2) their floppitiness. In other words, they don't offer enough resistance to airflow, and they tend to bend out of the way rather than force the air to go through themselves. Nevertheless, I've wanted to investigate memory foam for quite awhile but couldn't justify spending $30 for a pillow or pad just to get two bits' worth of foam. Let us know what you find.

Meanwhile, consider ripping apart your HP inkjet cartridges and using the very dense foam therein. That was a gift from Audiocats.

Smeggy, are you doing some sort of Transoceanic Felt Exchange with ludoo?

Quote:
Originally Posted by GuyMe View Post
Caulking ropes as good as Tak I assume right? How's this all look?
Rope caulk is just as good, but it looks like you've laid it on a bit thick. You only need a thin layer, but go ahead and give it a try anyway.

.
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post #2795 of 18847
6/4/08 at 9:34pm
Quote:
Originally Posted by wualta View Post
Part of the problem with most foams is 1) their density and 2) their floppitiness. In other words, they don't offer enough resistance to airflow, and they tend to bend out of the way rather than force the air to go through themselves. Nevertheless, I've wanted to investigate memory foam for quite awhile but couldn't justify spending $30 for a pillow or pad just to get two bits' worth of foam. Let us know what you find.

Meanwhile, consider ripping apart your HP inkjet cartridges and using the very dense foam therein. That was a gift from Audiocats.

Smeggy, are you doing some sort of Transoceanic Felt Exchange with ludoo?


.
The good thing about memory foam is that it's not very floppy and when warmed will form to the shape of the indentation and doesn't try very hard to straighten itself out again unlike normal foam or latex. It's fairly dense so together with the shape forming and compression ability should make an excellent damping material I think. We'll see soon enough.

Ludo is kindly sending some partially modded K240s for me to play with the SFI drivers. I can't recall if there's felt coming with them. He generously offered these out of the blue. A very nice gesture indeed!

The inkjet felt is interesting though I'd need to give them a damn good washing first. Magenta and cyan ears may look a little odd
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post #2796 of 18847
6/4/08 at 9:39pm
Quote:
Originally Posted by wualta View Post
Nevertheless, I've wanted to investigate memory foam for quite awhile but couldn't justify spending $30 for a pillow or pad just to get two bits' worth of foam. Let us know what you find.
Take a look at the custom foam section on foamorder -dot- com.

-john
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post #2797 of 18847
6/4/08 at 9:40pm
Quote:
Originally Posted by wualta View Post
Rope caulk is just as good, but it looks like you've laid it on a bit thick. You only need a thin layer, but go ahead and give it a try anyway.
It worked, maybe too well. They sound a touch too dark now. I still haven't tried the reflex dot though...
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post #2798 of 18847
6/4/08 at 11:12pm
There used to be a store a mile from my house called The Foam Store in the basement of a strip shopping center. They had a few thousand square feet of every imaginable kind of foam. Unfortunately, they're rent was upped and I thought they went out of business. Doing a quick search, they're about 10 miles away, but in an area I go to somewhat frequently. Next time I go near it, I'll see what they have. I'll also give them a call.

The web site smeggy linked to has a page of open cell foam, including thin, pink, anti static foam. Packing Foam, Foam Packaging, Packaging, Packaging Material.

Places that sell upholstery supplies may have foam.

I've been using 1" thick stuff and squeezing real hard while I reattach the screws. My hands have cramped a few times, but I know that felt is hard against the back of the driver. I've tried cutting the foam in half, but I've never been able to do it evenly, so I've been afraid to use it.
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post #2799 of 18847
6/4/08 at 11:12pm
I have received my very nicely matched ~125R SFI drivers from ericj. Thanks!

I like the mounts they are on, but will have to find the right size screws to make use of them. Shouldn't be hard. The hard part is finding a cheap fosterphone that will work well. I plan on trying out this isobaric shindig even if only just to say that I did (but I hope it works out). What shape/size of housing is ideal for this application?
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post #2800 of 18847
6/4/08 at 11:16pm
Quote:
Originally Posted by ludoo View Post
It's difficult to get the exact felt thickness from this picture, but I think I know now why all my mods start as severely overdamped: felt here is 4 or 5 times the thickness as the one in the picture.
Density matters much more than thickness. 1/4" low-density felt has audibly less damping effect than 1/16" felt of extremely high density. Try the blow test.
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post #2801 of 18847
6/4/08 at 11:24pm
So I won a pair of akg 240 drivers and I'm going to try out a dual driver ortho/dynamic isobaric enclosure. What material should I make the housings out of? any dimension recommendations? If not, whatever, I can wing it. Hahahaha.
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post #2802 of 18847
6/4/08 at 11:35pm
Quote:
Originally Posted by scompton View Post
I've been using 1" thick stuff and squeezing real hard while I reattach the screws. My hands have cramped a few times, but I know that felt is hard against the back of the driver. I've tried cutting the foam in half, but I've never been able to do it evenly, so I've been afraid to use it.
Sometimes a job calls for thinner stuff. The thinnest i can buy locally (that I've found anyway) is 1/2 inch.
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post #2803 of 18847
6/4/08 at 11:37pm
Quote:
Originally Posted by FooTemps View Post
So I won a pair of akg 240 drivers and I'm going to try out a dual driver ortho/dynamic isobaric enclosure. What material should I make the housings out of? any dimension recommendations? If not, whatever, I can wing it. Hahahaha.
PVC pipe? From smeggy's experiments, I think wood is too heavy with 2 drivers.

I've been thinking of various ways to do a dual ortho driver. I have a long honey-do list so won't really have time to play around for at least another month. I don't really want to glue things together because if something doesn't work, I don't want to destroy the drivers getting them out. I really haven't thought of a way to hold the drivers in place in PVC without glue. PVC is also too thick for a baffle although I thought of gluing tubular screw anchors to the PVC to attach baffle material to it.

Quote:
Originally Posted by ericj View Post
Sometimes a job calls for thinner stuff. The thinnest i can buy locally (that I've found anyway) is 1/2 inch.
Yeah, I couldn't take the picture that GuyMe took. With the inch thick foam the driver is 1/2" out of the cup before I put it together. It was very difficult with the ATH-2. The hardest thing is lining up the screw holes.
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post #2804 of 18847
6/4/08 at 11:50pm
Quote:
Originally Posted by GuyMe View Post
It worked, maybe too well. They sound a touch too dark now. I still haven't tried the reflex dot though...
...and now I think I made it too bright! I didn't block the top relative to head position, but the top if turned a bit counterclockwise. I blocked 5 holes, I suspect 2 or 3 holes will be just right. Cymbals are currently sizzling.
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post #2805 of 18847
6/5/08 at 12:00am
I was also thinking of more interesting ways to use dual drivers. One of the ideas was to make a crossfeed driver. Have one driver shooting into the ear directly like normal, and another off to one corner being fed the opposing channels signal so you get a nice crossfeed without electrical or programmed jiggery-pokery. I've yet to hear any crossfeed that didn't lose something in the signal due to the mixing needed with only two drivers. This method would keep the original signal while adding the second to the mix in a natural, organic fashion with no signal degradation.

This is the sort of thing that happens when I have drivers to play with...
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Gear mentioned in this thread:

Yamaha Stereo Headphones
$Too low to display at
See it »
Fostex T50RP Closed Ear Stereo Headphones
$110 at
See it »
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