Best High Current amplifiers stable into low impedances

I went through the 2 Ohm dance with my now sold Thiel CS3.7 speakers. I thought newer speakers were easier to drive.

The amp I am likely going to get for my Livingroom is the KRELL KSA i400. It is 400 watts of Class A (depending on demand) at 8 Ohm. It doubles down to 800, and then 1600 watts. It is supposed to be able to double again to 3200 if your power source can provide the current.

I do not think that 400 watts of Class A will double, nor half. I remember an interview with the designer where he said it stays at 400 watts of Class A when it is doubling.

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I have the KRELL Dou 175XD that has similar tech as this new amp. I love the 175XD, which I use as a headphone amp (’ear speaker amp’).

The CODA #16 also doubles into 8 - 4 - 2. It is a great sounding amp.

pass / threshold / usher

gryphon

sanders

krell

classe

coda

bryston

odyssey

top parasound, musical fidelity, mccormack

upper ayre, hegel, plinius, perreaux

On the used market, Innersound Electrostatic amplifier. Or Sanders or Coda.

These amplifiers share a common design approach - numerous transistors that can dump gigantic amounts of current into any load. Here’s something I clipped from the enjoy the music review of the Innersound amp:

The InnerSound Electrostatic Amplifier ("ESL amp") solves this problem by using a massive output stage. Each output transistor is capable of delivering 250 watts -- and there are eighteen of these per channel. As a result, it can deliver a staggering 135 amps of current with a combined power rating of 4,500 watts per channel! The output impedance of an amplifier must be lower than the impedance of the speaker, or current clipping will result. With so many output devices, the output impedance of the ESL amplifier is virtually zero. Current clipping simply is no longer an issue.

This amp does not sound dry. It sounds beautiful. Like music. I’ve emphasized it here because I’ve owned one. A tremendous piece of gear. A tremendous value. The Sanders amplifiers are evolutions of this design and are extremely good value. Same with Coda. Mind-boggling approach. Totally cool.

There are lots of brands that are "stable" at 2 ohms.  Implying they can deal with it for short stretches but they aren't comfortable at 2 ohms. 

I recommend Naim.  Naim is designed to pair with Focal and it thrives at 2 ohms.  Any of their power amps will do extremely well.  Focal speakers tend to have relatively low impedances and require high current amps but not much in the way of top line power.  

Sanders Magtech