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  1. #1

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    Cool Help 4ohm or 8ohm

    Knowing that 4ohm is better than 8 ohm for performance, can my system handle a 4ohm set up?

    Sony STR-DG1000
    Rti-6 Mains
    Csi5 center
    Fxi5 rear
    Psw 505

  2. #2

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    It might but not very well, and 4 ohm is not by design necessarily better than 8 ohm. There are just alot of nice 4 ohm speakers. There are also many high quality audiophile grade speakers with 8 ohm resistance.

    RT1
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  3. #3

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    It depends what your speakers ohm spec's are. That is what you operate at. Most home speakers are 8 or 6. Car speakers are 4. Your amp also has to be rated to operate at 4 ohms.
    How do you plan to run your system at 4 ohms?????
    PS3 and HD Front Projection, life is good. Too bad Blu-Ray and the PS3 are already obsolete.....

  4. #4

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    He is probably looking at these.http://www.polkaudio.com/homeaudio/specs/lsi15/
    Which give 4 ohm as the load.

    I don't see in the Sony spec sheet where that unit can carry a 4 ohm load.

  5. #5

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    Polk specs say 8ohm nominal on all speakers.
    The amp manual says it will operate as follows
    At 8 ohms and also at 4 ohms
    Front 120w + 120w
    Center 120w
    Surround 120w + 120w
    Surround Back 120w + 120w

  6. #6

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    Fronts (RTi6)
    Overall Frequency Response 40Hz-27kHz
    Lower -3dB Limit 50Hz
    Upper -3dB Limit 26kHz
    Nominal Impedance 8 ohms
    Recommended Amplifier Power 20-125 w/channel
    Efficiency 89 dB
    Crossover 2.8kHz, 12dB/octave high and low pass
    Inputs Dual (bi-amp) gold plated 5-way binding posts
    Surrounds (FXi5)
    Overall Frequency Response 45Hz-27kHz
    Lower -3dB Limit 55Hz
    Upper -3dB Limit 26kHz
    Nominal Impedance 8 ohms
    Recommended Amplifier Power 20-125 w/channel
    Efficiency 89 dB
    Crossover 2nd order LP/ HP complement 2.3kHz
    Inputs Gold plated 5-way binding posts
    Center (CSi5)
    Overall Frequency Response 45Hz-27kHz
    Lower -3dB Limit 55Hz
    Upper -3dB Limit 26kHz
    Nominal Impedance 8 ohms
    Recommended Amplifier Power 20-200 w/channel
    Efficiency 90 dB
    Inputs Dual (bi-amp) gold plated 5-way binding posts

    The Amp also has 4 or 8 ohms option in the setup screen

  7. #7

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    If you run 8 ohm speakers at 4 than you increase the chance of burning up your speakers voice coils. Your reciever will also run much hotter.
    In your case, with your equipment, 8ohms is what you need to stay at.
    PS3 and HD Front Projection, life is good. Too bad Blu-Ray and the PS3 are already obsolete.....

  8. #8

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    Thanks
    good thing I asked first

  9. #9

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    Quote Originally Posted by PaPa Jim
    Thanks
    good thing I asked first
    Welcome to the forum!!!!!!!
    PS3 and HD Front Projection, life is good. Too bad Blu-Ray and the PS3 are already obsolete.....

  10. #10

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    Quote Originally Posted by scottvamp
    If you run 8 ohm speakers at 4 than you increase the chance of burning up your speakers voice coils. Your reciever will also run much hotter.
    In your case, with your equipment, 8ohms is what you need to stay at.
    I think he means what happens if he sets the switch on his AVR to 4 ohms when running his 8 ohm speakers.

    If that is the case - all the 4 ohm switch does is throttle the amount of current that your AVR can produce (so it won't go into protect mode as easily with a 4 ohm load). It will work with the 4 ohm setting, but doing so may limit the power, current and dynamics of the amp when it really does not need to.

    It shouldn't break anything though.

    Michael

    (and yes - welcome to club polk)
    Mains.............Polk LSi15 (Cherry)
    Center............Polk LSiC (Crossover upgraded)
    Surrounds.......Polk LSi7 (Gloss Black - wood sides removed and crossovers upgraded)
    Subwoofers.....SVS 25-31 CS+ and PC+ (both 20hz tune)
    Pre\Pro...........NAD T163 (Modded with LM4562 opamps)
    Amplifier.........Cinepro 3k6 (6-channel, 500wpc@4ohms)

  11. #11

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    I accidentally ran my POS JVC receiver switched to 4 ohm for over a year and didn't notice any difference.
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