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  1. #1

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    Default Can I use LSi15 (4 ohms) + Pioneer AVR (6-16 ohms)?

    I would like to change the front bookshelf speakers into floorstanders, Polk Audio LSi15, 4 ohms.

    However, Page 19 of the A/V Receiver manual states to “use speakers with a nominal impedance between 6-16 ohms.”

    The current configuration is:

    A/V Receiver: Pioneer VSX-74TXVi Elite
    Front: Polk Audio RTiA3, 8 ohms
    Center: Polk Audio CSiA6, 8 ohms
    Rear: Polk Audio RTiA3, 8 ohms
    Sub: Polk Audio DSW-600

    Can I use the 4-ohm speakers together with my current 8-ohm speakers using my Pioneer A/V Receiver? Will it damage the speaker or A/V Receiver?

  2. #2

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    Don't do it, get yourself an external amp.

    It'll work but it's not recommended. It especially won't work if you crank those suckers up, don't expect your receiver and speakers to like you afterward.
    Truck setup
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    Phoenix Gold RSD65CS

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    Polk SR5250
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    Quote Originally Posted by heiney9 View Post
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  3. #3

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    Which one will be damaged first -- the LSi15 or the receiver?

  4. #4

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    Quote Originally Posted by dm1179 View Post
    Which one will be damaged first -- the LSi15 or the receiver?
    If you put it that way, you're implying that one of them is expendable. In that case, toss it my way ;)

    Honestly though, damage can and will occur to both your speakers and AVR. Whichever one will see it first is hard to tell, maybe someone will correct me on this one.

    -Freddy
    Truck setup
    Alpine 9856
    Phoenix Gold RSD65CS

    For Sale
    Polk SR6500
    Polk SR5250
    Polk SR104



    Quote Originally Posted by heiney9 View Post
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  5. #5

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    Can you do it? Yes. Should you do it? No.

    You can and will damage the receiver (first) as it decides to impode from the high current these speakers require, and once the receiver goes, it will probably take your speakers with them.

    Do it right! Get an amp.
    Main Surround -
    Epson 8350 Projector/ Elite Screens 120" / Pioneer Elite SC-35 / Sunfire Signature / Focal Chorus 716s / Focal Chorus CC / Polk MC80 / Polk PSW150 sub

    Bedroom - Sharp Aquos 70" 650 / Pioneer SC-1222k / Polk RT-55 / Polk CS-250

    Den - Rotel RSP-1068 / Threshold CAS-2 / Boston VR-M60 / BDP-05FD

  6. #6

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    I would imagine that if you push it, that the amp would run out of steam and the signal will clip or distort and blow your tweeters first. But that's not a WILL happen, that's a MIGHT happen-that all depends on how hard or loud you drive them. I've read many reports on this forum where people have driven thier LSI's fine for years on a reg AVR not intended for 4 ohm speakers. Not everybody pushes thier system. If my wife had control, the whole HT would only need a 15watt amp. I, however, need a tad bit more.

    Now will you be getting out the full potential the speakers have to offer? No. Not with an underpowered or less than capable amp.
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    HT:Onkyo 805, Emotiva XPA-5, Mitsu 52" 1080p DLP / polkaudio RTi12, CSIa6, FXi3, uPro4K
    2-chnl : Pio DV-46AV (SACD), Dodd ELP, Emotiva XPA-1s, XPA-2, Odyssey Khartago, LSi9, SDA-SRS 2 , SB Duet, MSB & Monarchy DACs, Yamaha PX3 TT, SAE Tuner...
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  7. #7

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    I have to agree with everybody on this one, lol. Can it be done, Yes. Can it be done safely with no worries of ever pushing something past it's limits, maybe. Is it worth the risk, IMO no. You would be better off buying an external amp and letting it take the load of the LSi's off your AVR's hands. Those LSi's love power and deserve every watt you can send their way, to be enjoyed at their full potential. Good luck and welcome to Club Polk.

    -Jeff
    HT Rig
    Receiver- Onkyo TX-SR806
    Mains- Polk Audio Monitor 70
    Center- Polk Audio CS2
    Surrounds- Polk Audio TSi 500's :D
    Sub- Polk Audio PSW125
    Retired- Polk Audio Monitor 40's
    T.V.- 60" Sony SXRD KDS-60A2000 LCoS
    Blu-Ray- 80 GB PS3


    2 CH rig (in progress)
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    It's not that I'm insensitive, I just don't care.. :D

  8. #8

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    That's a nice receiver you have there, don't let it catch fire by overdriving it.
    Main Surround -
    Epson 8350 Projector/ Elite Screens 120" / Pioneer Elite SC-35 / Sunfire Signature / Focal Chorus 716s / Focal Chorus CC / Polk MC80 / Polk PSW150 sub

    Bedroom - Sharp Aquos 70" 650 / Pioneer SC-1222k / Polk RT-55 / Polk CS-250

    Den - Rotel RSP-1068 / Threshold CAS-2 / Boston VR-M60 / BDP-05FD

  9. #9

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    Don't do it. Buy a 4 ohm stable amp to run those speakers on.
    Sunfire TGP, Sunfire Cinema Grand, Sunfire 300~2 (2), Sunfire True Sub (2),Carver ALS Platinum, Carver AL III, TFM-55, C-19, C-9, TX-8, SDA-490t, SDA-390t

  10. #10

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    I have a similar set-up and I fried ( literally ) my crossovers in my LSI's. An external amp is indeed the way to go.

  11. #11

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    Sell the AVR, and split the money btw a cheaper receiver, and 2-ch amp. If the Pio's still worth anything near its msrp, that is...
    High school and high-fi don't mesh well, wallet-wise.

    Home: Polk Audio LSi15 -> Onkyo TX-SR805 -> WDTV HD Media Server
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