Stereo or monoblocks

I believe that the McIntosh MC402 has enough power to drive the JBL speakers effectively.  However, if you want monoblocks here are the concerns.

1.  If the speakers have internal crossovers that cannot be bypassed, it is a good idea to use identical amps or amps with the same power ratings.  If the amps have volume controls then that makes it easy to match levels.

2. If the speakers have external passive crossovers, then you can obtain an active crossover which high/low level adjustments and you then don't necessarily need absolutely identical amps.  

IN any case, you definitely want to take these home and demo them in your system in your home before purchasing.

enjoy

Get the MC402

Honestly, the mono vs stereo discussion has never really shown a clear winner. They’re good stereo designs and good mono designs. It will all come down to the particular implementation you are looking at. I have used both and the only advantage that I see in the mono is placement feasibility. The McIntosh MC402 is close to a dual mono design if that’s any consolation and is a great option, reasonably priced on the second hand market. You can’t go wrong with it. I am not familiar with the Schiit Tyr but it was reviewed favorably in Stereophile magazine and is even less expensive. So either you will have a good amp to match your speakers. Give both a listen if you can.