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

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. 

 HPA-4 I believe is their upgraded version of the LA-4 with a headphone amp that is highly regarded.

The HPA4 and the LA4 sound the same on 2-channel. I have the HPA4 and owned the LA4.

@mybuddy I spent a bit of time at the SBAF web site (a very interesting audio site) looking into the Schitt gear. Seems the Schitt Mjolnir v3 preamp (no remote) that I also own is a huge hit over there. It is my 3rd best preamp, but folks seem to love it.

@mybuddy Yes, it is sold as a headphone amp but for my needs the headphone amp is not good. I use it as a 2-channel preamp, and it is very good that way. 

My Benchmark HAP4 preamp is also sold as a headphone amp, and it is also no good for my headphone needs but great as a 2-channel.

My Holo Audio Serene preamp also has a headphone amp (XLR1) and it is also no good for my headphone needs. 

I am 3 for 3 with my preamps and headphones.