Subwoofer Question - Connection ?

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Dolby

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So I just bought one of these :

http://www.hifiinstallations.co.za/ELAC/ELAC-SUB2030

First subwoofer I've had in years and have a few a question :

a) If your amp does not have a 'Subwoofer out' - would you connect this? I've got an AVR, so all good - but what if I get a stereo amp at some stage? Notice this doesn't have speaker inputs/outputs like my previous

b) Why have a right/left line input for a single speaker? I'm using the left - but it should make no difference? Is there any situation you'd use both?

c) I'm contemplating getting another - simple as a Y splitter from my amp - and each goes to the line input on the sub? Again, doesn't matter which?

d) In layman terms - what is phase? My older has a phase switch - 1 or 0 - but this has whole dial for variance of ... something?

 
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