Amps for KEF Blade 2

I am looking for advice from owners or dealers of the KEF Blade 2 loudspeakers. I am concerned my current pair of amps will not be sufficient for the B2s because of an article written about the original Blades published on July 5, 2013 in The Absolute Sound:

"The Blades have a nasty kick in their crossover that will suck an amplifier dry quicker than a student downing free tequila shots ... Just don’t be tempted to cheapskate on the driving amps, or you’ll live to regret it. Tube amps at least have an output transformer to hide behind, but when the Blades suck out a solid-state design, they celebrate by spotlighting their tweeter something chronic. To give you some idea of the lengths required, the otherwise excellent Rowland 625 [550 watts into 4 Ohms] wasn’t up to the job, it taking a pair of the 725 monoblocs [650 watts into 4 Ohms] to restore order. "

Are the Blade 2s just as demanding as the original Blades in terms of amplification? I would guess not due to the smaller 6.5 inch woofers, but this is just an uneducated guess. I own a pair of Benchmark AHB2 amps, which according to the manufacturer produce “a little over 500 watts into 4 Ohms”. Will this be enough?

Showing 2 responses by e91811

Thanks mmeysarosh for the informative post. I decided to contact Benchmark about their AHB2 amps driving the KEF B2s and this is what they wrote back to me:

"This is from engineering. This is actually a very easy speaker to drive in mono mode. It is a nice design with well-controlled impedance curves. There will be 6.0 dB more headroom in mono mode with this speaker. The AHB2 will have current to spare when driving this speaker in mono.

Max SPL in mono is 115.9 dB (ignoring power compression)
Max SPL in Stereo is 110.1 dB (ignoring power compression)

Typically you will need to subtract a dB or 2 to account for power compression."

It’s been a very long time since I took college physics so I can’t say I thorougly understand everything that the both of you wrote, however, I do understand "current to spare"! In conclusion, I’m still not sure if the B2s are easier to drive than the original Blades but, it appears my amps will be able to handle the B2s so I suppose I should be satisfied with that answer.

Fantastic together. I have been on the audiophile merry go round for more than 25 years. I use a Mac mini into a PS Audio DirectStream DAC directly into the amps. I’m done. This is my “forever system”. Good luck to all of you and merry Christmas!