Orthodynamic Roundup

[jageur272]

Quote:

Originally Posted by JadeEast /img/forum/go_quote.gif SFI in the wrong enclosure = head laser.

Quote:

Originally Posted by smeggy /img/forum/go_quote.gif yeah, it reverts to it's original purpose.. tweeter

Yeah, I figured as much. My last SFI project actually turned out so well, I almost preferred it to my YH-1's. I just removed a good amount of damping and added some foam around the driver to try to increase bass and it helps, but I still don't have nearly as much as I would like (I can hear sine waves down to 20Hz, but the quantity just isn't there). But should I just assume that the only solution would be just to change enclosures?

EDIT: I didn't have a good seal between the baffle and the cup -_-. All is good now

 

[BoilermakerFan]

Quote:

Originally Posted by smeggy /img/forum/go_quote.gif I don't have my camera here at work so I'll post some pics tonight. Brians set has the newest baffle type though I don't know it makes any sonic difference it's certainly nice to work on the lathe. As to the cable, each set is slightly different so I couldn't pin anything down to a particular wire and these days I'm also using spc. It'll take a while before the color deepens. Even oiled it's still very light but time and some sun should give them a nice rich look. In the meantime, here are some before assembly

Yeah, I'm quoting with the pics!

Man, Smeggy, they are just awesome and I can't wait. I heard Madrone Burl's sonic properties are superior to all other woods.

I'm pretty sure it has to do with their propensity to grow out and away while clinging to the cliff sides in the PNW. A domestic exotic with a scrappy, will not fail growth initiative. I need to get some 8-4 stock from a friend of a friend up there to make a headphone stand for them, or maybe I'll really do it propa' and commission Dr. Wood for a stand after I get the wood shipped to him!

What do you say Steve? Up for a little Madrone sawdust?

 

[wualta]

Quote:

Originally Posted by jageur272 EDIT: I didn't have a good seal between the baffle and the cup. All is good now..

You couldn't have popped up at a better time to underscore what the Smegster just said about keeping the joints in a headphone airtight, driver to baffle, baffle to cup, for exactly the reason Smeggy said. I can't overemphasize the fundamental importance of controlling the backwave coming from a dipole driver. It has the power to eliminate exactly all the bass the headphone puts out, and you don't want the diaphragm moving but producing no usable acoustic output.

IQEM, do I see an Eagle H 4300 in that photo?

 

[iQEM]

yes, Wualta...it is an Eagle H 4300...

 

[smeggy]

pics for Brian.

 

[sachu]

^^ me want!!

IS that black banding on the bottom of the posts smegster?

 

[ujamerstand]

My God. That finish is like a beautiful pearl. Makes my mouth watery...

 

[gurubhai]

All this Thunder Pr0n on display.

Impressionable minds like mine should keep away..

 

[ujamerstand]

Quote:

Originally Posted by wualta /img/forum/go_quote.gif You couldn't have popped up at a better time to underscore what the Smegster just said about keeping the joints in a headphone airtight, driver to baffle, baffle to cup, for exactly the reason Smeggy said. I can't overemphasize the fundamental importance of controlling the backwave coming from a dipole driver. It has the power to eliminate exactly all the bass the headphone puts out, and you don't want the diaphragm moving but producing no usable acoustic output.

Can you elaborate a bit more on this subject or provide a good resource to learn about this material? What is the difference between a bass port and slight venting caused by a gap between the baffle and the cup? I understand that a headphone might loose all its bass without a slight venting using a bass port, but how does over venting cause a lost in bass as well?

 

[dBel84]

for those who have not yet seen the lcd2 thread



I am so thoroughly enjoying these headphones it is not even a little funny..dB

 

[swt61]

Quote:

Originally Posted by smeggy /img/forum/go_quote.gif pics for Brian.

Smeggy those are absolutely gorgeous! My hat is off to you Sir.

Brian you're a lucky guy!

Smeggy I did manage to score a pair of O2 pads, which Don reinforced with some memory foam. So I'll be getting the full benefit of your design.

Quote:

Originally Posted by dBel84 /img/forum/go_quote.gif for those who have not yet seen the lcd2 thread I am so thoroughly enjoying these headphones it is not even a little funny..dB

Holey cow! You weren't kidding when you said they improved the aesthetics! Those are fantastic! Those are absolutely on my 'to buy' list!

I got hooked on the Ortho sound with my first pair of high end headphones in 1982. They were the Yamaha YH-1000 (if I'd only known how rare they'd get). I'm so thrilled to see this small ortho revival taking place!

 

[Sambones]

Quote:

Originally Posted by ujamerstand /img/forum/go_quote.gif Can you elaborate a bit more on this subject or provide a good resource to learn about this material? What is the difference between a bass port and slight venting caused by a gap between the baffle and the cup? I understand that a headphone might loose all its bass without a slight venting using a bass port, but how does over venting cause a lost in bass as well?

I'm with him. What's the effective difference between a loose baffle and a bass port? Is it in the quantity of the escaping low-frequencies, or is it in how it affects damping?

Obviously, it works. I'd just like to know, why?

Er, I do understand the concept of sound cancellation, I mean just as relates to not having an airtight baffle vs having a port.

 

[wualta]

Mostly it's a matter of torturing the backwave so that it's either mechanically separated from the frontwave or delayed so that it's no longer the mirror image of the frontwave.

If you delay the backwave by making it crawl through a labyrinth (as with a felt-covered vent) or through a tiny port (as with Smeggy's design), cancellation is greatly reduced. In Smeggy's 'phones above, it doesn't matter because he's using some very heavy-duty earpads-- his "bass port" is really a pressure relief port which keeps the resonant frequency of the driver low. If you recall, he arrived at that port's diameter via a series of cut-and-try experiments on the puck-style supra-aurals using the SFI driver. When the port was bigger the bass suffered. Likewise, if you take the felt off the vents of a Yamaha, some of the bass goes away.

Make the holes small enough and you have some of the effect of a layer of felt. Koss makes use of this in the KSC-75 driver and of course there's the known effect of MicroPore tape. So there is a sort of "magic size". Let the leak/vent/port get too large and you're in trouble. Does that help?



Yay Audeze guys. Thumbs and big toes up. Now that's a headphone.

 

[Faust2D]

Quote:

Originally Posted by dBel84 /img/forum/go_quote.gif for those who have not yet seen the lcd2 thread I am so thoroughly enjoying these headphones it is not even a little funny..dB

I like how they look. What seems strange to me that they did not use flat head screws, would have looked better that way IMHO.

I need to catch up with this thread I have been busy at work and listening to my Ergo AMT a lot lately, I really dig them.

I also played a bit with driving orthos with my small speaker amp working as power amp fully opened and preamp controlling the volume, they sound better that way for sure.

 

[Faust2D]

Quote:

Originally Posted by wualta /img/forum/go_quote.gif Yay Audeze guys. Thumbs and big toes up. Now that's a headphone.

Are you getting one Wualta? Would be nice to hear hear impression compared to stats and various orthos you that have around.