looking for a Integrated amp $6,000 range

Many good choices. I love my Jeff Rowland Continuum S2.

According to Stereophile's measurements its's fabulously efficient - 94.5 sensitivity BUT: "it needs to be used with an amplifier that can deliver high current into low impedances. Not only are there two minima in the bass of less than 2 ohms, and another of less than 3 ohms in the mid-treble, but there is an amplifier-crushing combination of 3.3 ohms magnitude and 60 degrees capacitive phase angle at 20Hz." So let's bear this in mind when making suggestions. Normally tube amps would be considered as well, with that sensitivity but that doesn't appear to be wise here.

John1,
which speaker are you referring to?
thanks,
Dan

Luxman. On the used market. You can save a bundle. I own the L-507uX MK2. Wonderful amp. Customer service is outstanding. 

Not sure if your preference is for SS or Valves but I can certainly recommend a used or discounted Ayon Triton III with its 8x KT150’s and Triode/Pentode options.

Amazing tech and build quality, maybe check the manual out online for an insight.

I’ve used it with Harbeths, Escalante Fremont Mk2 and Tannoy Arden Legacy’s.

Ayon Triton III does the business, try and hear one or if taking a risk, it’s minimal taking account of its quality although I imagine a few of the suggestions here fall into that category.

Remind me what your speakers are?