As a long time Thiel CS 2 owner let me say while your old Pioneer will work, you won't ever get what these speakers are capable of from it. The CS 2's with their 6 Ohm minimal 5 Ohm nominal impedance may be the easiest of all Thiels to drive. However, the soft ported bass highlights the extended high frequencies and they are at best moderately sensitive at 87db. All Thiels require are seriously good amp! Your room, desired listening levels and type(s) of music you listen to will determine how much power you will need. Very few integrated will do them justice. With the right ancillaries them are quite capable of providing magic. Without, they are can be a whole lot less satisfying. If you just want backround sound, I humbly suggest you look elsewhere.
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