Superex Pro B Headphones Questions

[goraman]

I may try that by just makeing a small circular hole around the center of the tweeter.
If I don't like it I can awlays replace the foam.

[lebob]

The foam is simple and should be easy to replace. I just pried two staples up and it slid out without ripping.

[lebob]

I got some help and a sketch of the schematic from someone on another forum. The first is the stock schematic. The second is mine with the voltage divider on the woofer. I tried it at -1db on the woofer. R1 is 1 ohm, R2 is 60 ohm. I used vintage Allen Bradley carbon composition resistors. It seems smooth and to be just about the right amount combined with removing the foams. Metal film resistors and silver wire would probably increase the presentation of details even more. The mods may have acutally added resolution and depth to the soundstage. I'll take more time to listen to be sure. After I put new cables on them, I'll make handmade leather ear-pads and headband cushions. These will be my tricked-out vintage headphones.

I've been using them with an Ipod Classic and an Almarro A205A MkII tube integrated amp using CD's and vinyl. I like them as much as much as my other headphones with my tube amp. I need more time to critically discern the differences. With the Ipod I think the loading needs to be adjusted.




'

[goraman]

someone on another forum even knows about Superex?
I am impressed please show pictures!!!

P.S. I still havent found the broken pair but there is one more storage closet left to plow through. Jeff

[goraman]

What dose lo2 and hi2 mean?

BTW what are your other headphones?

[lebob]

High-z and low-z is impedance. A Swedish guy into vintage audio on the AudioAsylum vintage forum said he has two pair of Superex. I put one of your interior photos from this forum (hope you don't mind) up with my schematic drawing to get help. After looking at his corrected drawing from my schematic, I realized what was happening with that transformer. The first winding serves as a low pass filter for the woofer and as a step up transformer to the second winding from low to high impedance for the tweeter to create the correct load for both tweeter and woofer. Pretty cool; it must have been custom wound just for the Superex Pro B.

In my new experiments this evening I disconnected the voltage divider and upped the high pass capacitor to 1uf. I am now fooling around with Zobels. I am getting close to having a sound that is very similar to my Altec speakers.

I have Sennheiser PX100 for Ipod, Sennheiser HD485 for computer, Sennheiser HD580 for tube amp, Superlux HD681 for everything because they kick @ss (new style with better darker color trim not red, smooth mods, and re-cable), the Superlux are my favorite, and Yuin PK3 for wife's Ipod.

[goraman]

The speaker they most remind me of is the Tannoy Westminsters, Not overly bright,big glorius mids and a full rich low end.
I was very impressed with the big Tannoys, Not nearly as much bass or as dramatic as the JBL Imperials I heard but a big and open presentation.
The Imperials where just huge both in size and in there thunderus sound, I remember feeling my beer can vibrate in my hand when Stevie Nicks sang.

[Spur07]

I'm still waiting for a pair of Pro B's to come up on eBay.

[goraman]

I'm still waiting for a pair of Pro B's to come up on eBay.

They will sooner or later,vintage headphone collectors sometimes drive the prices up on real clean ones Lebob got lucky and paid very little for an outstanding pair.

[Spur07]

They will sooner or later,vintage headphone collectors sometimes drive the prices up on real clean ones Lebob got lucky and paid very little for an outstanding pair.

Yeah, I already regretted not pulling the trigger on a pair the other week - they were green and in mint condition and went for £29. That seems to be the average right now. I can't wait to implement your 'tweaks'.

I can see myself using a headphones based system a lot more in the future, so the Superex with a nice little headphone amp or decent soundcard would suit me well.