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Orthodynamic Roundup - Page 1425

post #21361 of 23553

Akai ASE-50?

post #21362 of 23553

2.

 

Next clue to this evasive ortho:

 

 

post #21363 of 23553

Looks like they forgot the driver.

post #21364 of 23553

3.

 

Tonight's last lead, tomorrow the model will be revealed. Note the "R.P.D." abbreviation - ring a bell? True or false?

 

post #21365 of 23553

That's so clean I thought it was a computer render.

post #21366 of 23553

Rotel ?
 

post #21367 of 23553

Oh wow I know what it isph34r.gif, how the heck did you find that?

 

I won't spill the beans save the fun for tomorrow.

 

What a find, especially in that good of a condition.


Edited by nick n - 4/2/13 at 6:05pm
post #21368 of 23553

4.

 

And here it is: The Hosiden DH-80-S.

 

 

Wouldn't have found it if it wasn't for my fellow countryman DAC:s previous research.

post #21369 of 23553
post #21370 of 23553
Quote:

 

 

That's right. A fair price, I would say. Front of the driver is protected by some synthetic felt:

 

 

The abbreviation "R.P.D." intrigued me, together with the 150 ohm impedance. What conclusion to draw?

post #21371 of 23553
Quote:
Originally Posted by MDR30 View Post

 

 

That's right. A fair price, I would say. Front of the driver is protected by some synthetic felt:

 

 

The abbreviation "R.P.D." intrigued me, together with the 150 ohm impedance. What conclusion to draw?


I'd guess Regular Phase Driver.

post #21372 of 23553
Quote:
Originally Posted by MDR30 View Post

 

 

 

The abbreviation "R.P.D." intrigued me, together with the 150 ohm impedance. What conclusion to draw?

Beautiful, this is the part of the ortho thread i love. Hunting unknown orthos and updating history, disecting their innards etc :). Hasnt been much of this in recent years. Congrats on your v.rare find, one I couldnt not find either.

RPD must mean regular phase diaphragm as mentioned before. I was thinking maybe it would have a T30 driver inside from the looks of the outside, but this pic of the driver rear you showed doesnt seem to suggest that. I would have thought RPD meant a fostex association, so im a bit confused here too, possibly a T20 style driver if RPD is mentioned?
Is there any way to get a better look at the driver?

post #21373 of 23553

Congrats! I missed that one, although I've been checking that used items market now and then. I've been sloppy lately looking for vintage orthos....

 

Now, how about a picture of the driver? And maybe an update to the wikiphonia page?

http://wiki.faust3d.com/wiki/index.php?title=Hosiden_DH-80-S

 

Quote:
Originally Posted by MDR30 View Post

 

 

That's right. A fair price, I would say. Front of the driver is protected by some synthetic felt:

 

 

The abbreviation "R.P.D." intrigued me, together with the 150 ohm impedance. What conclusion to draw?

post #21374 of 23553
Quote:
Originally Posted by Kabeer View Post

Beautiful, this is the part of the ortho thread i love. Hunting unknown orthos and updating history, disecting their innards etc :). Hasnt been much of this in recent years. Congrats on your v.rare find, one I couldnt not find either.

RPD must mean regular phase diaphragm as mentioned before. I was thinking maybe it would have a T30 driver inside from the looks of the outside, but this pic of the driver rear you showed doesnt seem to suggest that. I would have thought RPD meant a fostex association, so im a bit confused here too, possibly a T20 style driver if RPD is mentioned?
Is there any way to get a better look at the driver?

 

Well, the cup design and the R.P.D. abbreviation was what sent some tingling down my spine - an OEM Fostex "Regulated Phase Dynamic"? But as far as I know, there never was an 150 ohm Fostex (that impedance is typical to Yamaha and PMB).

 

Quote:
Originally Posted by DefectiveAudioComponent View Post

Congrats! I missed that one, although I've been checking that used items market now and then. I've been sloppy lately looking for vintage orthos....

 

Now, how about a picture of the driver? And maybe an update to the wikiphonia page?

http://wiki.faust3d.com/wiki/index.php?title=Hosiden_DH-80-S

 

 

More pics? Right. I started from the pads which are simple and convenient clip-ons:

 

 

On the baffle, there are three small holes close to the periphery - see red rings. If you carefully insert and press with a screwdriver or similar tool, the chrome ring will start to give away and can be removed. It has three friction pegs which are fixed with a little glue.

 

 

 

The very elegant brushed steel ring is actually made of plastic.

 

 

 

Beneath the ring, the plastic cover is held in place by three screws, also pressing the foam against the back of the driver. Forgot to take a photo of that, but here's the plastic cover:

 

 

 

And once the lid is removed, we can see the driver!

 

 

 

Yes, most likely the ubiquitous Sawafuji/Audio-Technica/Pro 30 driver. [Edit: apparently it's an unknown driver, larger with 50 mm diameter, but similar to the driver mentioned. See later posts.] It's glued in place. The construction of the cup makes modifying quite easy - it only takes a minute to test different types of damping.


Edited by MDR30 - 4/5/13 at 1:45am
post #21375 of 23553

HOK 80 to HP-50 convolution.

 

 

These are the raw uncompensated responses measured without the artificial ear. Don't mind the noisy recording at the lower frequencies. The convolution filter on the HOK was lowpassed, hence the response takes a cool dip in the upper treble.

 

CSD plots below - compensated - recorded without the artificial ear. They are, in order, HOK, HP-50, and HOK convolved.

 

 

 

 

The HOK unconvolved has a decay hump around 2-3 kHz not present on the HP-50 - it's gone on the convolved HOK as well. Similar bass decay on the -50 and convolved HOK, while the normal HOK has slower decay there. Not quite as clean a decay on the convolved HOK as on the -50, but otherwise reasonably close.

 

Listening, a clear difference between the convolved HOK and HP-50 is the convolution gave a bit too much treble above 13 kHz or so. Fixing this with EQ, there is very little difference in sound. Mainly in soundstaging - the HOK projects the image forward while the HP-50 more to the sides. Overall tonal balance is quite similar, same with apparent detail retrieval.


Edited by vid - 4/4/13 at 6:41am
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