Looking for 200 watt Amp to drive Dynaudio Heritage speakers

Owning relatively insensitive speakers myself (sensitivity of 86 dB at 2.83 Vrms and 1.0 meter on axis) that also have a low’ish impedance (4 Ω nominal, 3 Ω minimum, low reactance), but a high power handling capability, has led me to appreciate how more power (650 wpc/8 ohms/side in my case) can bring them to life in a way that results in a weightier, more tonally rich delivery that increases my overall sonic enjoyment.

@mitch2 Just a few items to point out here. The first is that the more power you need, the harder it is to find electronics that also sound like music. To that end, if you really need 650 Watts for your speaker to sing, they are next door to criminally inefficient, since you’re likely to never really get them to sound real.

As speakers become less efficient, a common problem is thermal compression, where the voice coils (in particular that or those of the woofer(s)) heat up with musical notes, thereby dynamically reducing current flow with those notes. The more efficiency you have, in general the less you deal with this problem and of course its far easier to find electronics for them that are musical.

Also FWIW there is no need for higher efficiency speakers to have less resolution or bandwidth. My speakers at home are 98dB and are flat to 20Hz; they are some of the most resolving speakers I've heard.

People have asked us why our class D is only 100 Watts (into 8 Ohms; clips at 125Watts and 250 into 4) and the answer is above. If you really need more power than that you need 1000 Watts, as 10x more power is needed to sound twice as loud.

Simply doubling power is only 3dB, hardly audible. So this is really far more about how the amp behaves with a musical signal than it is power! Even with a speaker of 86dB, the first 5 Watts are still the most important.

Coda S20. 200W into 8 ohms. 100 amperes peak per channel. 45 lbs

$1200 for 200wpc

another vote for Hegel H390. I use it for Dynadio Contour 30 to great effect. 

200W into 8 ohms. 100 amperes peak per channel. 45 lbs

@som FWIW Dept.:

The 100A has nothing to do with the output power just so you know. That’s probably the current that flows when the power supply is shorted for 10ms. I guarantee that if 100A flowed through the output section it would be permanently damaged.

The math tells you what is up. Power is mathematically related to speaker impedance and current:

P = R x Current squared

(R is the speaker resistance)

So if we give the amp the benefit of the doubt that it can double power as impedance is halved, and so use a 1 Ohm load, the current squared is then equal to the power. That’s 100 squared or 10,000 Watts. That doesn’t ’square’ with 200 Watts into 8 Ohms if you see what I did there. If it can double power right to 1 Ohm it would be 1600 Watts- to my knowledge no-one makes a 10,000 Watt amp that might be considered hifi.

If we use that current rating as a short circuit value (essentially a measure of how much capacity is available in the power supplies) then this makes more sense. We make a tube amp that has 80Amps available by that measure (the MA-2).