Loved the detail in the mid to high range on my AKG K702 s but the low end just wasn’t quite there. I did a search and found there is a simple modification that can be made that brings a ton more bass to these cans. I would not recommend doing this if what you’re listening to is classical music, but if you’re engaged in any modern music where you need to hear and feel the low end, I highly recommend this mod. You can find videos on youtube showing you how. This mod is the same for the K701, Q701, and K702. I believe it can also be done on the K712 which my research says is just an updated K702.
I’m writing this to reassure you that it is not difficult and that it is well worth doing.
First you must remove the outer screen. This is the toughest part. It only needs to be turned slightly counter clock wise but is very difficult to do. Push pins work best – so I am told. I had to make do with a couple of tiny screwdrivers. I pushed so hard – which was necessary, that when one of the screwdrivers slipped off the screen, it punctured my finger. Ouch! I thought for sure that the screen would tear or break, but it is surpassingly tough – at least it was on my “Made In Austria” ones. The most important thing is to be careful removing the side where the headphone cable attaches – don’t move it to far or you’ll break the wires. In the video I watched the person doing the mod was able to remove the membrane covering the bass port cleanly. I wasn’t. It seems like rubber cement or silicone was holding it on. I used my screwdriver blade under about half of it then used tweezers to pull it off. The way I did it rendered the membrane useless should I change my mind – but I won’t. These headphones now deliver the bass I need to hear.
I highly recommend this mod.