Audio Round-Up in Colorado Springs

Audio Round-Up in Colorado Springs
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Welcome to our "General Rants'n'Raves" section. As the name suggests, this is the place for sharing your Strong Opinions on all things hi-fi. Your Strong Opinions may be positive or negative, enthusiastic or apathetic. We only ask that you express yourself in a mature, thoughtful, respectful, and productive manner.
I've noticed several CDs that cause large subsonic woofer excursions. One clear example is Stevie Wonder "A Time to Love". This CD has a lot of real bass, but it also has this subsonic ringing throughout the CD.
Looks by eye to be close to 1 Hz. My guess is that something in the recording chain had a regenerative ear below the audio band. This means that it is close to being an oscillator at that frequency but without enough gain to sustain oscillation. Then every bass note that comes along, kicks the system and makes it ring at that very low frequency.
Hi,
I have a pair of Thiel CS1.5 speakers, they have been great and I love them. I hate to get rid of them but I want to make a surrond sound system. Can someone recommend a good surroud sound setup using my Thiel's and without breaking the bank. I know I need a center channel but what kind should I get, do I really need a subwoofer and rear speakers, these are the questios I have.
Looking for collective wisdom as what would be a better amp for a pair of Paragidm Studio 100 V4?, also adding the receiver Marantz SR8002, or the Rotel RSP 1069?
Thanks a lot!
Pablo