Preamp for Magnepan

what amp do you have?

how much will you spend?

do you want phono?

Keep an 'eye' out for impedance mismatch.
Some pre's may be higher than your amp will be comfortable with.

You can always add phono and an outboard DAC later, as funds and need allow.

I own new 3.6 purchased this year. I have a Bryston 4B-SST2 amp. I also have a Bryston BP26 which I would NOT recommend, unless you have a tube DAC. I also have a VAC Standard I just bought: a 4 tube pre which I would recommend. ($4K new, used from the goN' $1,500)
Or I also have a Audio Research Sp-15 bought here, (new $7K used $1,750.) They are here, but the folks selling are just asking too much and the two available have NOT sold at the $2,200 asking price The SP-15 is an SS with a decent tube phono.(aand does not sound too dry)
The VAC is the rarer of the two.
Buy a tube pre because you can hear the difference with a Maggie. The tube pre just makes the sound more realistic, if you buy a solid state, you may or may not have it be a little lean. It may be stronger bass with a SS pre, a bit, but not worth the lack of natural sound.
If you are buying maggies, you clearly want music,not just loud noise.

I owned a combination of Magnepans and various Bryston amps for years.I always used Audio Research tube pre amps,they were a perfect fit,LS 15 and later a REF 3.For more particulars and recommendations flip me a pm.

Joule Electra is my new favorite preamp. I have used a Sonic Frontiers Line 3 on a pair of Magnepans 3.6 with excellent results when I was auditioning speakers. I have since replace my preamp with Joule Electra which I like better. I may trade up in the Joule Electra line but I am sticking with their preamp.