Agreed, fingers crossed cause these speakers are horrid to drive.
May be that's what people said on the internet but they often said such thing without stated the underlying conditions.
Reality is, such large speaker can be considered power hungry but most of the times there are not if used for less than reference level (like most people do) and seating distance not too far such as less than 4 to 5 meters.
Take a look of the specs, assuming yours are the RS 9 Kappa
If you know how to calculate the power requirements, that's great but if not, just use an online calculator and you will see that with just 20 W, you can get reference level of 105 dB, that's super loud! from 15 feet:
Peak SPL Calculator
So, those who said they were horrid to drive, might be sitting very far in a very large room and/or listen to even above reference level.
Having said that, I don't believe the 102 dB/1w/m is realistic, so I would de-rate it by 13 dB, to say 89 dB and the results would then be:
about 90 dB, from 15 feet, 25 W, or
92 dB, from 12 feet, 25 W, or
105 dB (ref level), 12 feet, with 500 W
You can see that there is truth in the speaker being "horrid to drive" as a general statement, one must know the use case and go from there, and keep in mind I arbitrarily de-rate the sensitivity spec from 102 dB to 89 dB, so in reality, I doubt most would need 500 W from 25 feet to get reference level.
Also, your proposed use case is to use the V3s to drive the 2 12 inch woofers only, so your power requirement would drop below the calculated results shown above.
Such large 4 ohm rated speakers of love "power" or current, but how much you need depends a lot on how loud you want to listen to and your seating distance.
