I was an ARC dealer for many years. The ARC LS2 as good as it is, is no match for the newer SP16L. IMHO, it would a very good upgrade.
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The SP16L can present problems with the volume steps on sensitive speakers. The volume steps are not fine enough.
Mine works fine with my Vandersteen 2CE signatures which are 86db efficient.
It might be a problem with your speakers which are 90db efficient.
Try it first to see if it is a problem. The newer SP17 has finer volume steps. Some Guys put in a resistor to solve the problem. Otherwise it is a fine sounding Pre and hard to beat for the price.
The Volume steps is its only vice.