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Please help me understand Eltax Evolutions

Discussion in 'Home Cinema Speakers' started by KraGorn, Sep 13, 2003.

  1. KraGorn

    KraGorn
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    I recently got some Eltax Evolutions dirt cheap ... ie. £100 ... and have no idea if they're "good" but they're doing fine for me at the moment as I build my HT ... busy installing an AE300 + SR4300 at present ... so please don't tell me they're considered cr@p by the cognoscenti. :D

    The speakers came without any instructions and there's a couple of things about them I can't figure out:

    1) the front main speakers have two pairs of terminals with a jumper connecting one pair to the other. From experimentation they seem to feed the mid-range and tweeters respectively.

    WHY? What benefit is there to be able to drive these from separate power amps (which I'm assuming is the purpose)?

    2) there's a switch for "phase", being '0' and '180' ... I think this is part of the bulti-in sub-woffer amp, but again can't see it's purpose. Well, obviously I know it creates an anti-phase signal, but I don't see or indeed hear what effect that has.

    Can someone please explain these myteries?

    Cheers.
     
  2. SanPedro

    SanPedro
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    Krag

    The 2 pairs of terminal are for bi-amping/bi-wiring. It's claimed that the sound quality can be improved if you send 2 sets of wire to a speaker from the same output on your amp. Keep the jumpers in place if only mono wiring and take it out if you are biwiring. Bi-amping is similar except using 2 amps to drive 2 speakers. One amp per speaker.

    Never tried either myself. Some reckons it's 'Emperors new clothes/ others have noticed big differences.

    Cheers

    Chris
     
  3. KraGorn

    KraGorn
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    Thanks for that description Chris. It surprised me a little since I fail to see any electronic reason why two feeds from the same power-amp should drive the units different from one feed with the shunts in place ... I see you're sceptical too. ;)

    Using different power-amps with tuned filtering I guess would make sense for audiophiles, I doubt my old ears would notice the difference. :)

    Thanks for that ... any idea on the 'phase' switch?
     
  4. SanPedro

    SanPedro
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    Not 100% sure. I believe some separate subs have a phase switch which allows you to tune the phase of the sub with the other speakers in the room - especially if the sub is placed away from the main speakers.

    Not quite sure how this applies to the elatxes. Some playing around required I guess. It's not my area of expertise TVH.

    Cheers

    Chris
     
  5. KraGorn

    KraGorn
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    Okay, thanks anyway. I did play around some time ago and couldn't detect any difference so was asking in case someone indicated what I should be looking for.

    Cheers
     

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