Headphones and speaker amps!

The other day I saw a thread on here about a guy who decided to try powering his Sennheiser HD600 from his speaker amp and said that it had worked out really well. That got me curious and I decided that it was something I would be interested in trying but before I tried it with my HD600's I wanted some practice on some other phones that I don't mind blowing up. So I initially tried it with a pair of KSC55's . When I stripped the cable each side had it's own ground so I figured it would just be a piece of cake and wire it to the speaker taps just like a regular speaker and lo and behold I'm getting no sound at all. I also decided to try it with an old pair of Bose Triports and it was the same deal. The cable had separate grounds for each channel but when I ran the wire to the speaker taps I would get no sound. Am I missing something here. I think it would be real cool to get this to work once even if it's with crappy headphones. I love to tinker with everything but I'm not sure why it wouldn't be working. The stereo amp I'm using works fine so It's not the amp. Any ideas?

I tried the battery test on the Triports and got nothing but wouldn't you have heard a pop or something if they had blown? Also I noticed that when I stripped the cables the colored ones which I assume are not ground have practically zero copper to them. Just some of kind fiber in them. I can literally see maybe 1-3 strands in them. Is that normal? It was also like that with the Koss KSC55's. This kind of has me confused.

I expected better out of Koss as far as the wiring but not surprised about the wiring from the Bose phones. Surprises me that they were able to pass any kind of a signal at all when they still had their headphone jacks attached. How disappointing. When you say that's a no are you saying I didn't strip the wires correctly? 

Care to explain how to do it correctly. Never had trouble stripping cables and wires before. All I did was take the casing off the cable. 

Thanks for the reply. I will give it a shot and see if it works. Cheers!

This was just an experiment to see if I could get it to work. I had some old Bose Triports that had their headphone jack chewed off by one of the dogs and an old100 watt speaker amp sitting around that isn't really worth anything so I figured there was no harm in at least trying it. I was actually able to make it work and I was actually quite surprised at how much better it made the Triports sound. As you can imagine the bass jumped a bit in what is already a very dark and bassy headphone. It also brought out some details. It definately sounded better then they normally do but they are still Triports and yes there obviously was added noise but just a slight hiss that wasn't even noticeable when playing the music. This experiment will not be expanded to my HD600's as I'm already driving them with a Schitt Lyr which is plenty of power already. As I said this whole thing was an experiment with some old crappy equipment. It was at least fun tho to get it working. Cheers!

Just curious about whether or not rigging your headphones up this way is in any way similar to a balanced headphone setup? Not necessarily the signal but the actual headphones themselves. Since your grounds are now separated instead of combined at the headphone jack? Would this be similar to a balanced ground setup or anything?