Man, I didnt know about the internals and got rid of D-35 and kept the D-25. I use MDR-V6 (easy to drive and comfortable for me to listen for a period of time) When I listened to both (Mega-Bass off
on the D-35), the D-25 sounded more neutral and the D-35 sounded bright.
The D-35 had far more functions than D-25.
I'm always looking out for a D-25 battery pack and havent seen one in ages. It looks something like the regular battery pack that attaches at the bottom but has a slot in the middle that holds 6 or 8 alkaline batteries. Are you familiar with what model no. it is?
D-25 / D-25S / D-250 has the best sounding, clean and clear treble of all the Sony discmans. I could even use the word 'unbelievable' when referring to it.
D-35 / D-350 has a rough sounding patch of its treble, somewhere between, to my ear, 6000 Hz and 10000 Hz, and it causes treble to sound 'over the top' a bit. It is not shrill bad but one can hear it. I think the blame could be assigned to the D-35's digital filter. The problem is that when listening to badly mastered albums / tracks that have shrill high frequencies, D-35, because of its treble, makes things worse. In these cases it would be better to use some other model of Sony discman, or to use headphones that have rolled off treble.
I am currently trying to find actual rechargeable batteries for some Sony discmans; it would be worthwhile because they comfortably beat, in sound, the current line up of digital portable music sources. Almost a quarter of a century old small electro-mechanical machines sound better than the modern digital marvels.
As for a battery pack, there might be a better solution, I sent an email to a battery manufacturer and if things turn out right I will let you know.
Edited by zorin - 2/5/14 at 3:43am