I have to thrown in my 2 cents here. The LS99 and KWA99 are truly exceptional. I am using them with sensitive speakers at around 94DB (Icon 12, O Audio) and the sound is remarkable. I love the pre as it has sounded so good with any amp I have paired with it. I have tried Class D, Class A/B and the KWA 99's which are biased into Class A at 15 watts. I never leave 5 watts in my 13X18 space and I listen somewhat loud but not crazy loud. These are just exceptional and are a better natch to the Icon 12 than others that cost 8X the price. Awesome bass, power, solidity, texture and they have an organic flow, soulful. These merge full body sound with detail and also image very well. I can not stop listening. I have recently had Luxman, Nagra, Orchard and LAIV amps here but these, there is just something special about them. Very special amps and pre, and price is awesomely fair. Not cheap but in this case you do get what you pay for, and maybe more. I just wrote an article about ModWright at my website as I feel they are way under rated.
https://www.stevehuffphoto.com/2025/05/20/an-under-rated-audio-company-modwright-instruments/