[Brafield]

I have a 100W per channel 8ohm Sony STR-DE197 tuner amp, at present
powering small inexpensive Yamaha 6-ohm 60-200W speakers -- 6.5 x 6.5
x 12 inches wall mounted.

I really should have got bigger better speakers, but I simply hadn't
the cash at that time.

Can anyone suggest a more suitable pair of speakers, max. 18" height,
even a discontinued model I could find, on a modest budget?

I have no technical knowIedge, but I notice there's a difference in
"impedance" numbers between my amp and my speakers; is that a serious
mismatch?

Forgive me for trespassing on a high-end forum, but I did not know
where to post.