Originally Posted by Navyblue
I don't think my finding very different from yours though. I agree there is a low midrange and upper bass hump, and coupled with the laid-back-ness and lack of dynamic, they can make things seemed veiled and muddy for certain materials. As for how bad it is, I guess it depends on where does one want to draw the line. Personally, I think they sounded not far from what they cost, whereas the K501 is clearly not on the same league in technical abilities and presentation when compared to the unmodded T50RP. But the T50RP definitely sounded weightier than the K501, it reminded me of a much crappier HD650. Till now I still have my doubt that it could overtake the performance proven HD650 after modification, which is one headphone that I intend to get if I am not pleased with the T50RP and FA003, in case they are just another FOTM.
I think my K501 is also the "bass heavy" version. I find it interesting that, not only you have the T50RP and K501, you have the FA003. That is one headphone that I wanted to get initially, I ended up with the T50RP first because I unexpectedly won an auction. I'd be very glad if you could describe them (modded and unmodded) in relation to each other. And also the mod that you've done to the T50RP.
Sorry for the long delay to respond. I had to try to remember what mods I made to my T50RPs! First off, I am not sure I would waste my money on the Fischer FA-003 at this point, as, for me at least, the T50RP can be modified to far exceed the Fischer's capabilities. Stock though, the FA-003's are far better, IMO. They are actually quite good phones for some types of music, but I find the sound stage to be pretty constrictive, and the overall sound of properly modified T50RP's significantly outpaces them in all major areas I can think of (lows, mids, highs, soundstage, overall believability). The pads are nice, though...
Now, as far as the T50RP's, mine are a modified version of the Rastapants 2 840 that Mr. Speakers has so kindly put together. I used original Dynamat to line just the backs of the cups, which are then covered with Paxmate. I believe the center pillar thing is covered with Paxmate as well. The baffles are covered with Plasticine that is fairly heavy and tapered out to the edges. I have removed the white covering on the driver back and am using an electrical tape reflex dot on the cenrer square. I have about 2 cotton balls teased inside the cups. I did not seal the cup seams at all. Finally, I believe I have the original black felt over the 4 baffle strips on the inside, and I think they are all still open (no electrical tape to block them off). On the ear side of the driver, I left the felt in place and covered it with a layer of original dynamat and a layer of Paxmate. I have cut out the black felt over the driver, and I use Shure 840 pads with a rolled up gauze pad to wedge the back of the pads.
Finally, keep in mind that the AKG K501 really needs good amplification to shine IMO. I am extremely happy with the overall sound of my pair, although the thing I like about the T50RP's compared to them is the greater weight they give to instruments, particularly electronic instruments. For classical music, from chamber to large scale, I prefer the K501's. For rock, pop, etc., I prefer the Fostex's.