Amp for Vintage Heresy

We'll leave out the part about Klipsch Heresy's sound quality and lack of bass for now and focus on doing what can be done to work with what you have. Given their 99dB sensitivity, 10-20 watts is plenty, 30-40 is overkill unless you like loud and have a big room. Also, tube amps are a given to try and tame the Heresy's midrange nasal quacking tendencies' especially on vocals. A small tube integrated like a Luxman SQ-N150. Rated at 10W/ch, it also features a more than compete MM/MC section, and the build quality only Luxman can do. If you're thinking you need the extra power, a Primaluna Evo 100 gives you 40 w/ch of EL-34 bliss. It's really quite nice, if lacking the Luxman cachet. Beyond that, you can shop the various flavors of questionable quality, but inexpensive ChiFi tubes. Proceed there at your own risk, knowing support will be ... uh, limited. A word on speaker placement. Because they lack bass, Heresy's need to leverage as much acoustic room loading as possible, so keep them up against the back walls. Pulling them into the room, as you would most speakers, just kills what little low bass they have. Remember, they were designed originally as a center fill (L+R) for Klipschorns. Finally, even though they're not my favorite speaker doesn't mean you can't do right by them and build something fun and enjoyable around them. You may also want to investigate the various crossover mod kits available.