correct wattage for LSi15s

flldtt
flldtt Posts: 24
edited May 2009 in Speakers
Hi, I'm new to the advanced fidelity field. I just purchased a pair of LSi15s to pair with my Sony STR-DG920 receiver. My question relates to my understanding of impedance. Since my receiver is rated at 110W x 7 (8 ohms, THD 1.0%), and the speakers are rated at 4 ohm impendance, does that mean they will receive 220W? Should this be sufficient for these speakers? Thank you for any help. I am moving to my first home and would like to avoid purchasing a separate amplifier right now, but if they need more power to sound great, I will have to splurge.

David
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  • Bernal
    Bernal Posts: 991
    edited May 2009
    flldtt wrote: »
    Hi, I'm new to the advanced fidelity field. I just purchased a pair of LSi15s to pair with my Sony STR-DG920 receiver. My question relates to my understanding of impedance. Since my receiver is rated at 110W x 7 (8 ohms, THD 1.0%), and the speakers are rated at 4 ohm impendance, does that mean they will receive 220W? Should this be sufficient for these speakers? Thank you for any help. I am moving to my first home and would like to avoid purchasing a separate amplifier right now, but if they need more power to sound great, I will have to splurge.

    David
    Same question for some time.
    You need to use an amplifier at 300 watts. It is the base for LSI sing.

    1) DENON AVR-4308CI: Advanced 7.1 CH/5.1+2 CH/ 3.1+2+2 CH A/V Home Theater /MultiMedia Multi-Source/Zone Receiver with Networking and WiFi/170 watts x 7 channels
    2) HITACHI P55T501. 55" HD1080 Plasma HDTV
    3) OPPO DV-980H 1080p Up-Converting Universal DVD Player with HDMI and 7.1CH Audio
    4) DENON DVD-2500BTCI: Blu-ray Disc™ DVD/CD Digital Player/Transport (
    5) POLKAUDIO LSiC (Center speaker)
    6) POLKAUDIO LSi15 LEFT (Front speaker)
    7) POLKAUDIO LSi15 RIGHT (Front speaker)
    8) POLKAUDIO LSif/x LEFT (Surround speaker)
    9) POLKAUDIO LSif/x RIGHT (Surround speaker)
    10) SONY SA-WP16 ( Sub Woofer 2X200W)
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  • cfrizz
    cfrizz Posts: 13,415
    edited May 2009
    Start splurging, but first make sure that your Sony has preouts to add separate amplification.

    And to correct the info above, Try to get an amplifier that has 200wpc @ 8ohm which will probably put out about 300wpc @ 4ohm.

    The more power you give the LSI's the better they will sound & the less risk of damaging them from being underpowered by an inadequate receiver.
    Marantz AV-7705 PrePro, Classé 5 channel 200wpc Amp, Oppo 103 BluRay, Rotel RCD-1072 CDP, Sony XBR-49X800E TV, Polk S60 Main Speakers, Polk ES30 Center Channel, Polk S15 Surround Speakers SVS SB12-NSD x2
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  • jimmydep
    jimmydep Posts: 1,305
    edited May 2009
    I was powering my LSI 15's with a Yamaha 95wpc receiver, I just added an Emotiva XPA-5 amplifier with 200wpc @8ohm & 350wpc @4ohm.

    The LSI's came ALIVE with the Emotiva. I didn't need my sub woofer any more and there was a significant widening of the soundstage, the vocals are more powerful with greater clarity.

    I would say go for the power!!!! you won't be sorry.
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  • cfrizz
    cfrizz Posts: 13,415
    edited May 2009
    Welcome to Club Polk Jimmy! And Thank You for the concise, accurate assessment of what lots of separate power can do for the LSI's!
    Marantz AV-7705 PrePro, Classé 5 channel 200wpc Amp, Oppo 103 BluRay, Rotel RCD-1072 CDP, Sony XBR-49X800E TV, Polk S60 Main Speakers, Polk ES30 Center Channel, Polk S15 Surround Speakers SVS SB12-NSD x2
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