Amp for Vintage Heresy

Such wonderful speakers! They are very sensitive, allowing you to discover any bottlenecks in your system. They also sing with low power, but will never have great bass. 

There are so many mods to the speakers, XO, new drivers, sealing the box, rewire, deadening of the horns and woofer basket....

I have vintage Forte, my friend's system is vintage Hersey. My system is vintage with a 200w MOSFET amp (tube like), and his is SET think it's 8w maybe 10w? Anyway, most of my listing, even at 90+ DB is around 1-5w, they fill the room with sound. Don't need a ton of power to make them sing. 

They do like very clean signal path, will let you hear all the good, and also the bad. Bad recordings will really sound bad, but so will the good, they will sound real good. IMHO, they sound better with Tube like amps over new class D, they need a "warm" signal, or they can sound harsh, tinny, shouty. 

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.

Thanks for the great input. I hadn't considered Luxman integrated tube amp but that could be real nice. I'll hunt around.

I was thinking 300b would be the right match but hearing more comments here about EL84s being better.

Update:
I returned the Wiim Pro Plus and bought a Chord mojo 2 (with my old macbook pro) and will try and clean up the source.
 

I run my Heresy and Forte II with a Dennis Had Inspire 45 amp and Had LP3.1 preamp.  Both sets of speakers have Crites upgrades, and the amp uses Emission Labs tubes.

The Inspire 45 may only put out around 2 watts, but it makes my Klipsch speakers sing.

I had a NAD 316B with vintage Yamaha NS-670 speakers while assembling Yamaha gear from same time period ~1976-78. For a few weeks had both NAD316 and Yamaha CA-1010 with same speakers. Sound difference? No idea other than Yamaha had more power for A-B volume test. Add in that at 56yrs old, ears are damaged goods as are everyone's. Perceived quality...well, no contest. Yamaha has VU meters, real wood veneer case, metal knobs & switches that click when you use them, heaven. Add in turntable and parents album collection from same time period is synergy at it's finest. You hear with your eyes better than your ears