Not enough juice with your amp. Same comments always with the 3/5s and less expensive electronics. Need a serious, high current amp to make they sound good, otherwise sound dull and lifeless. At least 70-80 watts with a good, high current SS amp, or 50 or so with a tube amp. But, when adequately powered, as good as any box speaker out there from 70 hz up. Have owned Tukans in the past, so I understand how with the Sony you would prefer them.
TH
TH