Audio Research LS-16 Mk2 vs LS-17 preamp

IMHO the LS-16 is a very good (but not great) preamp. If you want great you might look at the LS-26 - it's a giant killer.

EE read what I said before making comments and stop trying to play follow the leader. I have my opinion. I have nothing against ARC and have tried many of their products and have owned some. But ARC seems to dislike their own products because they replace almost every model or modify them every year or so.

Rwwear, What leader am I following? I have my opinion just like you have yours! and I stated it and mine was based on having owned the LS-16mkII for 3yrs. not one week!! Just because I happened to agree with someone else doesn't mean I'm playing follow the leader!
I have had and currently have ARC systems for 25 yrs.(not that I haven't tried other products)and find their products to be of high quality and a pleasure to listen to as has been voiced by many others.(again check the reviews)
As far as ARC disliking their own products because they continuely improve upon them, that's what their name indicates "research"(duh) They're constantly researching how to make their products better! That doesn't mean you have to change every time they do.(you don't buy a new car every year because GM Ford or Chrysler or whoever comes out with a new model do you?).
I currently have the LS-25mkII and am happy with it. I didn't feel a real urge to run out and buy the LS-26 when it came out even though I know it is better( yes I heard it)
Finally, they don't change their products every year. ARC products have a minimum 3yr.run

FWIW I have an sp16 (ls 16 with phono I believe) and think it is a fantastic piece. I can enthusiastically recommend it to others.

I bought a used LS-16Mk2 on Audiogon last year, and I am consistently impressed with the dynamics, imaging and natural tonality of the unit. (It replaced a Sonic Frontiers SFL-1 with Mullard tube.) My source is a Sony SCD XA777ES which has single-ended output only. Recently I tested the single-ended SP-17 in my system, which came close to the LS-16Mk2, lacking just a little in dynamics and presence. However, the fully balanced LS-17 (which I've not heard) offers some circuit enhancements over the LS-16Mk2. I would be willing to pay around $300 more for the newer model. But either one will bring you a lot of musical pleasure.