McCormack DNA .5? Do I need more power?

I have Vandersteen 2CE Signatures @ efficiency of 86DB. I had the B&K 4420 driving them but moved to a McCormack DNA-1. 150 channel into 8 but probably running close to 200 because the Vandys are 7 ohms I think. The unmodded DNA-1 provides plenty of power with more to spare so I think your 91 DB spendors would mate well with the DNA .5 as long as your room isn't too big and you are not looking to blow the roof off your house....

Eagleman

I don't know if you'll "need" more power, but a DNA-1 is not that much more expensive than a DNA .5. More power is usually "better", even if you don't absolutely need it.....

The McCormack 0.5 has a very conservative rating of 100 watts per channel, sounds much more powerful. I have had other power amps rated at 200 watts per channel that can't keep up with the 0.5. This amp has unlimited power reserves & I have yet to clip mine. By the way, I own the DNA 0.5 Rev A, offers a world class sound and easily beats most everything I have heard before it. Your above speakers at their efficientcy of 91 db would produce concert hall levels with the 0.5.

Anyone ever use a McCormack DNA .5 stock or Deluxe to power a pair of KEF 104/2 speakers? Anyone care to share their thoughts on how the combination sounded? Did the DNA .5 provide enough power to them?

Specs of the KEF 104/2s.

Model 104/2 Specifications:
Frequency Range: 55Hz - 20kHz ( 2dB)
Drive Units:HF: T33 25mm (1") Impregnated fabric dome
MF: 2 x B110 100mm (5") Doped Bextrene cone
LF: 2 x B200 200mm (8") Paper cone
Crossover Point:150Hz, 3kHz
Nominal Impedance: 4 ohms
Characteristic Sensitivity Level: 92dB
Amplifier Requirements: 25-200W into 4 ohms
Maximum Output: 112dB
Internal Volumes: LF 50 litres, MF 3 litres
Net Weight: 32kg (70.5lbs)
Dimensions: (H x W x D)900 x 280 x 415mm, 35.5 x 11 x 16.4 ins

Thanks

It's a great amp, but I had to get rid of my Rev. A due to clipping my Maggie 1.6's Everything was fine until a low bass note was played and the speakers would make a "snap" sound. The 1.6 just sucked the juice out of that amp. Moving to a W4S ICE amp fixed it of course. At 91db efficiency you will be OK. I just wanted to let everyone know there is a limit to what that or any 100 watt amp can do.