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Help choosing Power Conditioner

Completely new to this area. I would like a unit that:
a) regulates power, keeping it within the 120v range.
b) provides good and long-lasting surge protection
c) can be used with a power amp as well as preamp, and sources all together
d) Hopefully helps the audio, making it more open and dynamic without negative effects.

I need to say under about $750 used. My candidates are:
Monster HTPS7000
Monster AVS2000 (how are these two different)?
PS Audio Power Director 3.5
Blue Circle MR1200 Music Ring
Any others...
Thanks!
kck

Showing 2 responses by jman66

jman66
54 posts
 
Keep in mind that you could encounter a buzzing or humming transformer those PowerVar or Oneac units depending on their condition and also if there's any DC present in your power delivery.
Here a link to an excellent paper explaining the conditions that cause transformers to become noisy:

http://www.plitron.com/PDF/AES.PDF
jman66
54 posts
 
Tvad - Yes, I was referring to the transformer hum. The Powervar I used (ABC1200) had varying levels of hum by day, sometimes quiet in the morning and then noisy as heck at night. I tried some additional damping of the toroid, helped a little bit but not enough.
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