I am a owner of such a shitbox that spritzer seems to like so much. I don't understand much about electronics and maybe the assembled construction has some flaws, but who cares in a closed box? Much more important is, how it sounds. I had owned many amplifiers from stax before, but the sirrah sounds just great. Very strong bass, neutral sound and fine resolution. And the power is enough even for hearing loud. I think it is made for people with normal hearing, not for hearing impaired.