Amplifier for Infinity RS 5B?


Hello everyone!! I am from Romania and just entered like 2 or 3 years ago in this mad world of hi-fi. Also a new member on this forum. I have a beautifull pair of Infinity RS 5B which for the moment i drive with a Lafayette LR 1100 receiver (which by the way is in mint, mint condition :)1976 generation). The Lafayette is rated at only 25 watts per channel and I know that the Infinitys like a bit of power. I also have in test, from a friend a SONY TA F 690 ES amplifier. With the Sony the speakers sound much better. Any Infinity owners who can suggest a better amplifier for my speakers?
rafura
First of all thanks for the answer. I'll try to test other more powerfull amps. Hope I'll find the best, or at least a better combination.
I am the owner of a pair of Infinity RS IIIB speakers. Vintage Infinity (such as POA3000 or POA1500 & Onkyo Integra such as the 508 works well. McIntosh 275 sound equally as well.