So far from reading stuff.. Folks are saying the LS27 is 'better' than the Ref3
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From everything I have read or heard, the LS27 is the better choice. There have been a few threads here on AG that you may want to have a look at in addition to the responses you will get here. I have an LS26 and am waiting for the fund$ so I can take the step up to the 27. Although I may have to wait for the 28!
Before I try to answer the questions above, I would like to say how much I enjoyed my time with both units.
If you require big bass slam, the LS27 or REF3 may not be what your looking for. That being said, I don't recall feeling I was missing anything in the lower frequencies and the REF3 certainly had good bass extension, just not big bass. The 3 had a bit better resolution, detail and neutrality. The 27 had more of the old school Audio Research warmth and what some refer to as tube magic.
Trying to compare the REF3 with the Ayre KX-R would be difficult. The KX-R is nearly impossible to place, like one component has been casted out from the chain, it's beguiling presents emulates being moved from row 20 to row 7.
I have a rare REF3 LE that i had it through Steve Huntley when purchased new. The power supply was beefed up with another bank of premium caps (BG's) mounted on an acrylic board. Somewhat similar to what ARC is offering now with their SE upgrades. All resistors in the signal path have been replaced with Caddock's and some Vishay's and other mods i forget about. The only thing i do not have are the teflon coupling caps ARC is now installing with their SE upgrades. Those are proprietary so i would have to go with premium Vcaps.
If only money was no object!!!
I had him do similar mods for my REF2 Phono, DAC7, CL120's, but again, minus the teflon caps.
A sonic marvel.
I'm sure that HifiGeek can do as good a mod job as GNSC whether approved by ARC or not who cares! Personally, I didn't.
Steve has ceased modding ARC products a few months ago.
A shame. RIP GNSC.