A hole in the ear drum = a conductive hearing loss, and the hall mark result of that is a low frequency conductive hearing loss. (not as serious as a sensori neural hearing loss, as conductive are usally not permanent)
Interestingly enough, the location of the hole also determines what frequencies are impacted as well. The good news about holes in ear drums is that they usually heal over time, and even more interesting is that the eardrum is comprised of three layers of tissue, that are essentially woven, much like a spiders web. If there is a hole, tear etc, when the ear heals, it heals in two layers rather than three.
A side story. On the eve of the last day of my masters degree program... I was playing raquetball.... I took a hard shot to the ear....
The compressive force of air, blew a whole in my ear drum....
I drove home with a unilateral hearing loss, fearing that I was permanently deafened in one ear. The $5,000 stereo system in my car sound horrible as well!
Any how, after a night of no sleep, I drove back to the university, and luckily found that I just had a conductive hearing loss, due to a blown ear drum, and I would be fine over some time.
We had a girl in our program fall while water skiing, damaged her ear much the same way as well!