^ KPH40 (pphb) = KPH40 driver / capsules / pads on a Porta Pro headband. Porta Pro = Drop version As you can see the measured difference is minimal. The differences could be due to the observed difference in the rear cup, pads, or just positioning upon measurement rig coupler variance. Compare to solderdude's measurements. He also demonstrates
From what I remember about all the differences in Koss models, the SportaPro uses the same drivers as the KSC35 (not to be confused with the more well-known and popular KSC75). The drivers themselves use the same shells as the PortaPro drivers (in black instead of blue), but I believe they are titanium coated, which leads to the difference in
The easiest mod would be looking up for some Sennheiser PX200 cushions. They fit perfectly. Though they are much smaller then the discontinued koss SST model. Otherwise you'd have to take a cheap full size headphone and replacing its drivers with the koss ones.
Koss Porta Pro: Retro Style, Amazing Sound. Koss Porta Pro headphones offer you retro style and incredible sound quality, making them one of the best Koss headphones for audiophiles. Boasting an adjustable headband and lightweight design, they provide superior comfort while allowing you to customize the size to fit your head perfectly.
Honestly if it's from Koss and has 60ohms drivers or it's an electrostatic driver it's going to be a bang. Reply Chok3U Koss Fan / Grado Fan / Flathead Fan •