Neutral preamplifier recommendation $1K new

The Topping pre90 has gain issues that may or may not work with your amp. It was awful with all the amps that I had without adjustable gain.

The Kara maybe like my Schitt Mjolnir v3. That preamp sounds pretty good, but it is not really a neutral sound. I was under the impression that the Kara was similar sonically to the more expensive Mjolnir. I use the warm Mjolnir + Schitt Aegir v1 amp with bright headphones.

If you could save up another $1k you will be able to find a used Benchmark LA4 for $2k-ish. I used this preamp on every amp I have owned and loved the pairing. Currently I use it with the Sanders Magtech or the CODA #16. The LA4 is loved (and hated by some) for being the king of neutrality. I would not change this preamp for another preamp at any price (even if given for free).

Benchmark LA4 Pre-Amplifier For Sale - US Audio Mart

No such thing.  consider a passive preamp, transformer based is best.

@yyzsantabarbara If $$$ was not an issue … I agree the LA4 is ideal. Used LA4 is almost 3x the price of a new Kara.

@carlsbad2 You have a recommendation?

Not all amps pair well with passive preamps, so if you’re considering that make sure your amp is compatible first. 

Why not freya + ?

Freya+ is not a neutral preamp. It is even warmer than the Class A Schitt Mjolnir v3 that I have now. I owned the Freya+ at one time.