I actually had the data sheet for this tweeter in a very old book published by Philips India titled 'Designing Loudspeaker Projects' but I can't find it right now. IIRC, this tweeter had a high resonant frequency and worked well 5Khz and above. So it's definitely not going to sound sweet below that crossover range. But your 10" Tonegon should be able to sing nicely till about 10Khz or so.
The Yammy A/V receivers are definitely a very neutral sounding range. I also owned an RXV series at some point in time. The only issue I had with them was in high current situations in bass heavy movie soundtracks etc. For mid range and above duties they sparkle.
have fun with all the configs and do keep us posted.