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Thread: Lsi 25 hook up

  1. #1

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    Default Lsi 25 hook up

    Please help if you can
    I have a new set of LSI-25s as I described in an earlier post
    I upgraded from RTI-12s
    I am a little perplexed as to how to cable everything
    the way I have it set up now is as follows
    standard speaker wire to the lsi's from the Rxv-2600 yahama a/v receiver
    sub out from the a/v receiver to an old cerwin vega powered sub woofer
    also the lsi/c is wired standard, as well as some kind of polk bookshelf rears
    I do not understand the LFE thing
    the a/v has lfe out but only 1 , and each of the lsi-25s have a lfe input
    the cerwin vega sub has no lfe at all
    also the other perplexing thing is
    when I first installed the lsi's the sound was veyr diferent from the rti-12s and the base was incredable until I ran the yapo set up
    now nothing is incredible, sounds ok but not worth the cost of the upgrade
    maybe some on can educate my ignorate butt on the fine art of speaker set up
    I have all this set up in a living room approx 20 x 24 with an older 65" rear projection tv (not HD) but I am using a HD digital cable box for the 5.1 surround broadcast.
    also I understand that bi-wiring is a better way to go for the LSI's I d not quite grasp that concept either
    Thank you for you help
    Glenn

  2. #2

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    Default

    Here is the manual for the 3 hookup options for the 25.

    http://www.polkaudio.com/downloads/m...Si25Manual.pdf


    You may need Y connectors to give the subs the signal needed.

  3. #3

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    run your subs with the sub preout(s)(may need a splitter) to the speaker lfe inputs and run your left and right fronts to the top terminals, jumpers removed mains set to small
    SuperDave
    Yamaha RX-V992 (Center,Rears)
    Adcom GFA-5500 (Mains)
    Denon DVD-1920
    Mitsubishi 40" LCD
    DirecTV DVR Whole House
    Polk LSi25 Mains
    Polk LSiC Center
    Infinity RS1 Rears
    Monster THX Cables

  4. #4

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    Default Lsi 25 hook up

    Superdave
    Thank you for your reply
    I just want to be sure that I grasp it
    as I understand what you suggested I run the subwoofer line out from the amp(Yahama RXV-2600) to the line in on the powered sub
    and from the line out from the powered sub to the line in (not the lfe in) on the LSI-25s
    I remove the jumpers from the LSIs and connect the speaker wire to the top terminals
    and in base management I set the lsi speaker size to small

    and just because I think I need to know
    The fine sales person at Sound Advice (thats were I bought all of my gear)
    told me that the yahama rxv-2600 had plenty of power to run the lsi-25s
    but the more posts that I read the less true this statement appears
    according to the specs in the owners manual
    the minimum RMS power output is 130 watts per chanel @8 ohms
    and the dynamic power (IHF) what ever that means
    is 165w @8 ohms 205w @6 ohms and 340w @4 ohms
    is that enough power or do I realy need to pony up and buy a power amp

    I do intend to purchase a pair of the LSiFX surround speakers as soon as my allowance allows it or would you suggest something else for the rears (I am only running 5.1, I dont think my room is large enough for 7.1

    in the meantime does it hurt to mix the 4 ohm lsi fronts and center with the 8
    ohm rears? (polk book shelfs of unknown flavor)
    Sorry for the questions but I am realy Ignorant when it comes to all of this but I want to set up a nice system
    thank you for your patience and your help
    Glenn

  5. #5
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    I've toyed around with the LSi25's, I've found the best response is to simply hook them up like any other speaker and use the jumpers.

    The "high" section of the LSi25 has a passive high pass filter set at 80 Hz. Doing the "sub out" to line level input with speakers set to "small" will double filter the upper bass.

    Of course- YMMV. :)
    -Eric
    -Polk Audio

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    Quote Originally Posted by Eric Wong
    I've toyed around with the LSi25's, I've found the best response is to simply hook them up like any other speaker and use the jumpers.

    The "high" section of the LSi25 has a passive high pass filter set at 80 Hz. Doing the "sub out" to line level input with speakers set to "small" will double filter the upper bass.

    Of course- YMMV. :)
    i agree. just hook them up like any other speaker.. the sub will kick in just fine on the LSi25's. I'd run them full range or on large on your receiver.

  7. #7

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    Default not so

    running this way(jumpered at full range) will overtax the yamaha at high levels
    SuperDave
    Yamaha RX-V992 (Center,Rears)
    Adcom GFA-5500 (Mains)
    Denon DVD-1920
    Mitsubishi 40" LCD
    DirecTV DVR Whole House
    Polk LSi25 Mains
    Polk LSiC Center
    Infinity RS1 Rears
    Monster THX Cables

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