It will be if you don't play the speakers very loud. The 3a Sig. is not a demanding electrical load but they do have a somewhat low impedance of less than 4 ohms over some of the range. They are also somewhat inefficient. I would try before I buy and see. Could be fine. I think Vandersteen recommends a minimum of 100 watts.
Also, give them a listen with a Belles 350a solid state amp if you can. You might be surprised what you hear! It is rated at 250w/ch @ 8 ohms and doubles at 4. It is the best sound I have had out of the 3a Sigs period. The bass control is amazing( an area where I'm afraid the cary will come up short)The Sigs also sounded great with the ARC VT100 mk.III tube amps in a biamped arrangement (although the bass was not in the same league with the Belles)
Also, give them a listen with a Belles 350a solid state amp if you can. You might be surprised what you hear! It is rated at 250w/ch @ 8 ohms and doubles at 4. It is the best sound I have had out of the 3a Sigs period. The bass control is amazing( an area where I'm afraid the cary will come up short)The Sigs also sounded great with the ARC VT100 mk.III tube amps in a biamped arrangement (although the bass was not in the same league with the Belles)