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
This is so weird.  We have a guy here who thinks that one thing he makes up means something.  No one else would make up such a story.  You don't need double the wattage into 2 ohms to drive a 2 ohm load.  All you need is an amp that is stable into 2 ohms and has enough power to drive the speakers.  If your speakers are 87db at one meter....then lets say it is 83 db at your listening chair.  That means 93 db will be reached with 10 watts and 103db with 100 watts.  If that is as loud as you listen...I rarely listen this loud.... then a 1000 watt at 2 ohms amp will give you plenty of headroom.  This is simple science. 

If an amp can double its power from 4 to 2 ohms that means it has a very stiff power supply.  However, it does not insure that it sounds good with any load.  This is just a static test.  It means very, very little by itself. 

If you get 20 different amps that do 1000 watts into 2 ohms (with stability) then you will get 20 different sounds.  Some will sound bad, some good and some great.  The sound of an amp is dependent on hundreds of different things.  One factor (a made up factor) does not make a good sounding amp.  I made my amp sound way more dynamic and alive by doing various mods to it.  The power did not increase, the amps it can draw did not increase......but the powerfulness and transparency of the sound increased.  

Why oh why would anyone make a speaker with a 2 ohm load?  It makes no sense.  It is not more linear and/or lower distortion to have lower impedances.  If you have a speaker with a 2 ohm load that means you cannot use moderately powerful amps (that may sound better and be cheaper), you have lower damping factor and it is known by almost everyone that the lower impedance an amp has to drive the more distortion the amp produces.  Only those designers stuck in a paradigm from the past will make speakers that way today (Wilson, etc?.).  Even Magico has raised the impedance of their latest and best MKII speakers so they do not dip below 3 ohms.  These guys are smart.

The trend is for more sensitive speakers and/or powered woofers.  This is a good idea.  Look at the latest Spatial and GR Research open baffle speakers.  In some models you only drive the mids and highs (92-96 db sensitivity at 8 ohms) and you have either servo woofs or powered woofs on the bottom.  
Why oh why would anyone make a speaker with a 2 ohm load? It makes no sense.

Some of the best speaker ever, have loads like this and even worse, that’s why they are some of the best. EG: Wilson Alexia 0.9ohm in the bass and many others.
I couldn’t even be bothered to tell someone like you any more because you’d be deaf to it, as all your interested is selling your own Class-D IcePower 1200AS2 modules that have a woeful phase massive shift of 70’ degrees!!! between 7 to 15khz!!!!
No wonder Class-D detractors complain about the uppermids/highs so much.
https://ibb.co/JdrgGBH
george hifi,
Maybe you do much less listening than analyzing specs.  The Levinson ML2 fully broken in which I owned years ago was syrupy euphonic and veiled at low/moderate volumes with my electrostatic speakers.  Instead of claiming ricevs is a promoter for his amp, why don't you spend a little money, find out whether the phase shift has any relevance in your listening.  No risk to you, and then you could have more credible comments.  Alternatively, have someone gather a bunch of amps whose specs are unknown to you, do comparative listening, and see for yourself whether listening tests correlate with the specs.  The truth is that there is a very small correlation, but not enough to differentiate among good or great amps.  I have heard class D amps that sound euphonic/rolled off in HF, and others that sound harsh.  
I will add that my class D Mytek Brooklyn amp is very neutral, revealing and smooth in the HF.  It briefly shuts down at 300 watts into my inefficient electrostatic + parallel Enigmacoustics tweeter combination whose impedance is about 2 ohms in HF.  SO WHAT--it plays music beautifully over 99% of the time.  I am not complaining about its technical deficiencies.  I am looking forward to ricevs' more powerful amp.
find out whether the phase shift has any relevance in your listening.


If you believe there nothing to hear when you have 70 degrees phase shift at 5khz and still 50 degrees at 2khz!! then there’s no hope for you.
https://ibb.co/JdrgGBH


I have heard class D amps that sound euphonic/rolled off in HF, and others that sound harsh.

All because of the setting of the switching frequency output filter and where it acts, either "too high" or "too low"
"rolled off in HF" (too low) , and "others that sound harsh" (too high), with today’s 500khz switching frequency.

Raise that switching frequency 3 x to 1.5mhz as you can with GaN, and you’ve got rid of the problem because the output filter can then also be raised 3 x higher, and then you don’t get that phase shift so low down into the audio band or the problem of as you say ("rolled off in HF, and others that sound harsh"), because the filter then can be set to do it’s job fully and rid the switching frequency completely and not effect the audio band with phase shift.

It’s that simple, even the most technically inept should be able to understand, maybe! Or you can believe the ones that are trying to tell you it doesn’t matter. From day one Class-D has had this problem, because of it’s low switching frequency/filter.