2. amps-preamps
  3. 150690-2029

What Class D amps will drive a 2 ohm load

Just asking.

I see specs into 4 ohms but nothing into difficult speaker loads (like Thiel CS5's).

Thanks for listening, 

Dsper


dsper
georgehifi's avatar
georgehifi
10,312 posts
 
I believe PS Audio Stellar M700 monoblocks
are rated to be stable down to 2 ohms.
Into the OP’s speakers this statement means nothing, unless they can back it up with, "this amp can also almost double it’s wattage for each halving of impedance down to 2ohms".
  
You can put a 2ohm load on an 1980’s Nad 3020 integrated and it will remain stable and not oscillate or blow up also. But will it drive to OP Thiel CS5’s? NO!!!! It will make a noise out of them. Will it get the best out of them? "NO WAY IN THE WORLD!" 

Cheers George
twoleftears's avatar
twoleftears
5,318 posts
 

Here's a new model that claims it can handle 2 ohms.

http://lkvresearch.blogspot.com/2019/04/lkv-veros-pwr.html#!/2019/04/lkv-veros-pwr.html

golfnutz
231 posts
 

@rambo21

I believe PS Audio Stellar M700 monoblocks
are rated to be stable down to 2 ohms.
Class D 350 watts at 8 ohms, 700 watts at 4 ohms

Spec sheet for Icepower 700ASC specifies 2.5ohms minimum.


georgehifi's avatar
georgehifi
10,312 posts
 
Here’s a new model that claims it can handle 2 ohms.
This amp goes backwards in to 2ohms!!, like I said above with the NAD reference

Spec sheet for Icepower 700ASC specifies 2.5ohms minimum.
Same deal with this, what it’s true 8ohm, 4ohm, 2ohm "wattage figures"? do it "increase significantly" (almost double) as the impedance goes down.
This indicates an amp that will drive effortlessly the OP’s kind of speaker to it’s full potential.

Cheers George


golfnutz
231 posts
 

That was my point George, someone mentioned the Stellar M700 goes down to 2ohms, and the specs are only 2.50ohms.

It's also interesting that Stereophile didn't bother reporting specified power rating at 2ohms, but did mention THD rises into 2ohms at higher frequencies.

Like everything else, you get what you pay for and there is no free ride with Class-D amps (with reference to low impedance speakers).

We define clipping as when the percentage of THD+noise in the amplifier's output reaches 1%, and fig.5 indicates that the M700 slightly exceeds its specified power of 350W into 8 ohms (25.44dBW). Into 4 ohms (fig.6), the M700 clips at precisely the specified 700W (25.44dBW). Fig.7 plots the THD+N percentage against frequency at a level at which I could be sure I was looking at distortion rather than noise: 20V, which is equivalent to 50W into 8 ohms, 100W into 4 ohms, and 200W into 2 ohms. The THD is very low at low and middle frequencies into 8 and 4 ohms, but does rise into 2 ohms and at high frequencies.
Read more at https://www.stereophile.com/content/ps-audio-stellar-m700-monoblock-power-amplifier-measurements#rLo...

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