[wualta]

Fascinating. Looks like old photos of a penicillium mold. What are the parts on that diaphragm that rattle?

 

[DefectiveAudioComponent]

So the diaphragm is different. Intriguing!
Does the PMB100 magnets look similar to the PMB80 magnets?

 

[Faust2D]

Quote:

Originally Posted by Kabeer /img/forum/go_quote.gif Heres a closeup of the above diaphragm if anyone is interested (i think its rather beautiful): I couldnt find ANY physical flaws with it whatsoever.

I feel Wiki updates coming.

 

[JadeEast]

Quote:

Originally Posted by wualta /img/forum/go_quote.gif Fascinating. Looks like old photos of a penicillium mold. What are the parts on that diaphragm that rattle?

Little bits of metal or maybe pipe tobacco considering the smell when I opened the box. They are visible as black specks on the driver.

 

[DefectiveAudioComponent]

Quote:

Originally Posted by JadeEast /img/forum/go_quote.gif Little bits of metal or maybe pipe tobacco considering the smell when I opened the box. They are visible as black specks on the driver.

So now that it's open, can you get it off?

 

[JadeEast]

No problem cleaning it out. On the flip side of the driver there is a tab holding the magnet and driver together, I'm a bit hesitant to take it apart.

 

[wualta]

Got a photo of that?

 

[JadeEast]

Quote:

Originally Posted by wualta /img/forum/go_quote.gif Got a photo of that?

What luck the negs are just back from the lab.

 

[DefectiveAudioComponent]

Quote:

Originally Posted by JadeEast /img/forum/go_quote.gif What luck the negs are just back from the lab.

Is there a picture of the other side of the magnet as well? On the PMB80 it appeared that the holes were a bit smaller on the other side.

 

[JadeEast]

The holes are smaller on the inside, you can't see in my photo with just the one
light and the low angle. I'll have to bounce some more light in there if you want to see the taper.

 

[wualta]

Tapered holes? Wild. It's a case of being the Right Thing To Do, but whether it makes an audible difference... it would be interesting to know. I'm aware that there are some men who would want nothing between themselves and their diaphragms and attribute all kinds of horrors to the tiniest obstructions, so this attention to detail on the part of PMB would gladden their hearts.

 

[DefectiveAudioComponent]

Quote:

Originally Posted by JadeEast /img/forum/go_quote.gif The holes are smaller on the inside, you can't see in my photo with just the one light and the low angle. I'll have to bounce some more light in there if you want to see the taper.

So the magnets are very similar then, maybe identical. I think the Grundig magnets might be slightly different. Maybe I should take a family photo together with the Dual driver.

Something else... I found a cheaper quad cable for the PMB80 in a local hi-fi repair store. Is there something that could make it a poor choice that I should look out for?

 

[JadeEast]

Quote:

Originally Posted by DefectiveAudioComponent /img/forum/go_quote.gif So the magnets are very similar then, maybe identical.

In the close up here you can see the difference between the hole in the middle that is straight and the tapered holes surrounding it.

 

[mypasswordis]

Would this be kind of like acoustic horn loading?

Quote:

Originally Posted by DAC Something else... I found a cheaper quad cable for the PMB80 in a local hi-fi repair store. Is there something that could make it a poor choice that I should look out for?

Generally thickness, flexibility, durability are the main factors in cables. Don't want something massively clunky or microphonic... anything that could get in the way of just enjoying the music.

 

[JadeEast]

Quote:

Originally Posted by mypasswordis /img/forum/go_quote.gif Would this be kind of like acoustic horn loading?

Pretty miniature for horn loading but the same physics probably do apply. My guess would be that this was an attempt to reduce the parallel sides of the holes acting like little transmission lines or just to be cool.