Triangle Altea Esw amp recommendation


Greetings forum members! I am a novice and need help creating a descent system. I have a pair of Triangle Altea ESW speakers, an Oppo 105 player, and an Onkyo 706 SS receiver. My room is 15x20 feet. I listen to chamber, orchestral, jazz and classic rock on CD and SACD. The ESWs are bright and fatiguing with the Onkyo. I read that the Rega Brio is warm sounding for an integrated amp and may help tame some of the brightness. I also read that tube amps make an ideal (and perhaps necessary?) pairing for the bright Triangle speakers. I prefer to buy used and my budget is around $1000. I keep thinking that the ESWs could sound pretty good with the right amp! I am using standard speaker wire and RCA connectors. (I wonder if an upgrade in wire and interconnects would improve sound?) I would be very grateful for any help in improving my system. Thank you. 
ul585
Thank you russ69 and rocray. Can you tell me what Music Fidelity model would be a good pairing? I see there are several integrated amps made by Music Fidelity. Maybe someone out there has direct exoerience with the Triangle Altea ESW. Again, thanks.
I would love to tell you,but I just can’t remember. I know the speakers were the ones you mentioned. I pulled up a pic on the interwebs.  It was a local dealer,and I’m not sure he’s in business after the pandemic. 
Ok thank you for reaching out and helping me. I have read so.w good reviews on the MF amps. I found one about 13 years old Class A that I may buy. I will report back after I get it. Thanks agiain. And take care.