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Orthodynamic Roundup - Page 1432

post #21466 of 22863
Quote:
Originally Posted by vid View Post

^ I've achieved the same damping via digital convolution as with physical modding, obviating wualta's creed that no amount of EQ will give the same effect as physical modding, and re-evaluating the degree to which we're limited purely to physical modding in efforts to make these phones sound better.

 

As such, one is free to punch the drivers into whichever cups and still be able to return the sound to its original balance - most likely.


This is where life gets interesting. Personally, I have found that most of the results you get from modding can be replicated or bettered by designing pads that actually fit the users head and doing you're damping and venting there rather than in the cup itself.

 

 To your point, an interesting experiment would be to create anechoic cups and see what convolution can do with them.

post #21467 of 22863

First listen: deep, powerful bass, midrange honky, top rolled off. Stock damping is quite peculiar. I'll return to that topic. My impression is similar to ericj's findings earlier in this thread:

 

"While the extension is generally good on both ends (or good enough anyway - bass under 40hz and treble rolling off above 12khz, which might just be my own hearing) the only remarkable issue with it is that it has a bit of a midrange hump."

 

I see potential both regarding sound and construction. It all depends on the driver which apparently is similar to the T30 and T50, but definitely an original design by an unknown manufacturer.

 

 

post #21468 of 22863

HOK vs. HP-50 in harmonic distortion, in that order.

 

 

Level is somewhere between 85 and 95 dB SPL perhaps, but the same for both measurements.

post #21469 of 22863

Short Leak 3000 report

 

This is some beast to tame. There's a lot of bass and rolled off top. Beacause of this it's difficult to assess the midrange reproduction. The rolled off treble was noticed even when the headphone was introduced. Here's a graph from the January 1979 issue of Hi-Fi News (Wikiphonia):

 

 

 

I tried different sizes of reflex dots and ended up with a pretty large oblong to get decent treble:

 

 

 

Bass was still too loud, so I taped over the remaining slits except for two small openings:

 

 

 

On top of that the original slab of thick felt:

 

 

 

Bass was still not damped enough, and the large reflex oblong had the side effect of also amplifying the honky midrange. ("Sound quality was thought to be a little hard", according to the review above.) When I experimented I did not glue the felt to the driver, which it probably was on the original, and the pads were taped directly on the driver. The baffle is going to compress the felt even more and stop side leakage from the driver. Sound might change significantly when everything is put together properly.

 

Maybe a more elaborate damping solution is required, like the different ones tried out for the T50RP which has a driver with some similar parts. But the treble of the Leak 3000 (like som of the PMBs, for instance the U70) will probably never be as airy as a properly damped HP50.

 

I'll let it rest for a while before round two commences.

 


Edited by MDR30 - 4/22/13 at 12:34pm
post #21470 of 22863

Leak3K is a failure IME, abort the mission etysmile.gif

post #21471 of 22863

What are those brown spots on the foam? Dirt, glue or deteriorated foam?

post #21472 of 22863
Quote:
Originally Posted by MDR30 View Post

There's a lot of bass ... Here's a graph 

 

Where's the bass?

post #21473 of 22863

By all looks and description here this appears to be a tweeter hopelessly shoehorned into an enclosure woefully inappropriate to the task, New cups all around:)
 

post #21474 of 22863
Quote:
Originally Posted by Armaegis View Post

What are those brown spots on the foam? Dirt, glue or deteriorated foam?

 

Deteriorated foam, now brushed away.

 

Quote:
Originally Posted by vid View Post

 

Where's the bass?

 

Looking at the graph, one may wonder. I guess the Leak was heavily damped stock, the thick felt glued to the driver and possibly a paper disc of some sort there as well. My headphone looked like it had been opened before, so I don't really know what the original damping was like. But maybe Ocellia will find out if he opens his Wharfedale ID 2, basically the same headphone, just like the Heco PHI 300.

 

Quote:
Originally Posted by Hutnicks View Post

By all looks and description here this appears to be a tweeter hopelessly shoehorned into an enclosure woefully inappropriate to the task, New cups all around:)
 

 

I doubt it. Bass is too heavy and treble down 5-10dB from 10 to 20 kHz according to the British measurement. If heavy damping is required, I don't think the cups will affect the sound that much. As a matter of fact, the felt is thick but not that dense and there are six large holes to let the driver "breathe"; at the same time avoiding unwanted back reflections.

 


Edited by MDR30 - 4/24/13 at 11:58am
post #21475 of 22863
Quote:
Originally Posted by MDR30 View Post

Looking at the graph, one may wonder. I guess the Leak was heavily damped stock, the thick felt glued to the driver and possibly a paper disc of some sort there as well. My headphone looked like it had been opened before, so I don't really know what the original damping was like.

 

Could it be that it's a different version from the one reviewed? The impulse response in that review does look odd, too, so apparently something wasn't right with the driver.

post #21476 of 22863
What objective tests might we be able to perform to measure whether convolving affects the transient response of the transducer?


Sent by pneumatic tubes
post #21477 of 22863

No idea. Recording the driver play a tune of fast transients and looking at the resultant waveform is an alternative if one accepts a more perceptual point of view.

post #21478 of 22863
Quote:
Originally Posted by MDR30 View Post

 


I doubt it. Bass is too heavy and treble down 5-10dB from 10 to 20 kHz according to the British measurement. If heavy damping is required, I don't think the cups will affect the sound that much. As a matter of fact, the felt is thick but not that dense and there are six large holes to let the driver "breathe"; at the same time avoiding unwanted back reflections.

 

 

Not necessarily so. Depending on proximity and seal amongst other factors you can make a mid or tweeter push out oodles of bass. The resulting sound is absolutely miserable, reminiscent of a crystal radio being played in a cistern, but the low freq's are there to be had.

 

If you had a chamber to measure it with I would suggest anout of the cans driver test with a decent mic.

post #21479 of 22863
Just bought a pair of Yamaha HP-2s the other day. The HP-2 was the first Yamahas I owned in the mid/late 70's. then bought the HP-1s (late 70s) which I still have as my 'daily drivers'

#reunited
post #21480 of 22863

BTW, any yamie head ever heard the DT48? Everyone raves about its mids, are they seriously yamie-worthy? I read pretty much the same raving about the CD900ST and its 40mm drivers weren't quite up to the hype to my ears: bloated one-note bass, utterly boring mids and it seems to have been designed to be worn by kids or adults with very small heads. Only headstaging truly impressed me and I would agree that it sounds even better than the cd3k on this point.


Edited by leeperry - 4/26/13 at 12:43am
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