@river251 I think it's doubtful that you'll find your ideal amp that will drive Proac and Magnepan equally well.
If you're keeping the Response 2.5's that's one thing, if you're changing over to Maggies that's entirely different.
For many years, I drove Response 2.5's with a Cary SET 300B 12-watt amp. The results were delightful. This was when Dennis Had was still with the company, and when they were still using real 300Bs. The combo had his blessing, and it showed.
If you're keeping the Response 2.5's that's one thing, if you're changing over to Maggies that's entirely different.
For many years, I drove Response 2.5's with a Cary SET 300B 12-watt amp. The results were delightful. This was when Dennis Had was still with the company, and when they were still using real 300Bs. The combo had his blessing, and it showed.