Hi folks,
Have been using the K712 Pro for a few weeks now and I'm enjoying them quite a bit.
Indeed, they are a decent pair, offering great resolution and an excellent sound-stage.
They are also very easily tweaked to match your taste.
One can start by altering the shape/material of the OEM donut-shaped pads covering the ear-side of the baffle under the ear pads.
Or removing them altogether.
I think the foam rings add a bit of body, slam and 'weight' to the lower parts of the spectrum.
But I've noticed that they also affect higher-mid and lower-treble parts, making the sound a bit more splashy and 'grainy'.
The difference is small but you'll probably notice it if you listen closely, with and without the foam rings.
You could try adding similarly shaped pads on top of the OEM ones, but made of a thin
natural fabric (like cotton or wool).
This will help mitigate the grainy/splashy character of the OEM foam rings, while retaining their function of adding a bit of body/slam.
If you still find the treble a bit 'zingy' you could add a
thin cotton-mesh fabric on top.
I found the use of one ply of cotton bandage to be just right, in order for the driver to breath.
You don't want to cover the driver completely, or else you will start lose definition and speed.
Another modification that might be worth your efforts is re-cabling.
Apart from using a higher grade wire with better connectors, one could actually re-wire the headphones.
As already mentioned, OEM signal conductors are actually the two metal frames (covered by plastic tubes).
These are heavy-gauge, solid metal wires also serving as the structure holding caps together.
Clever engineering by AKG, but these wires are magnetic steel and one could replace them with something more proper, like silver-clad copper wires.
Finally, a
well known modification that I personally consider to be essential for this headphone is the so-called
bass-mod to increase lower bass.
This is done by exposing the back of the driver and removing the
round sticker covering the bass-reflex port.
It will increase the ability of the diver to move more freely and elevate lower-end response.
If you find the need to add a bit more bass to this cans, this is the straight way to do it.