The LS is for line stage which means it will handle everything but a turntable. The SP is for stereo preamp with a phono section. If you buy patiently your $2,000.00 can go surprisingly far toward true high-end stereo. On the used market may I recommend an SP 9 MkIII and a D200 power amp. You might even have enough left over for some Audio Magic cables which produces a very nice synergy. Good luck!
Audio Research LS vs SP?
I am looking into used Audio Research. My budget is $2000 for both power and pre. I am kind of confused about the preamp models. What are the differences between LS and SP? I am assuming the higher number is better than lower one. Am I right? Finally what combination do you recommend? Thanks. Dan