Compared to something like an m50 or HD 681 Evo, the bass on the K 240 is anemic. With the stock pads, because they are so flat, your ears will be touching the driver housing, of course you get the most bass out of them. With the hifiman velour pads you get more distance from your ears to the driver, which helps immensly in terms of comfort and in sound. Again, I dont find the bass to suffer or be more anemic than it originally was the stock pads. The bass on the K240 is just not the strongest out there, regardless of the pads.
So, maybe another can is more appropriate for you ?