In the good old days preamps had a balance control...but I really don't think that making one speaker play louder than the other will help. Both ears hear both speakers (or are supposed to).
I would suggest correcting the problem where it lies, in your ears. My wife recently got hearing aids, and, as an electrical engineer and audiophile, I was quite impressed with the technology. The audioligist we used ran a bunch of tests including what is basically a frequency response test of the ear. Then the hearing aid frequency response is adjusted to compensate. Various other hearing defects can also be compensated. Of course it is all done with downloaded software. Not cheap...but hey we are audiophiles.
I would suggest correcting the problem where it lies, in your ears. My wife recently got hearing aids, and, as an electrical engineer and audiophile, I was quite impressed with the technology. The audioligist we used ran a bunch of tests including what is basically a frequency response test of the ear. Then the hearing aid frequency response is adjusted to compensate. Various other hearing defects can also be compensated. Of course it is all done with downloaded software. Not cheap...but hey we are audiophiles.