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  1. #1
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    Default LSi9 Power Requirements?

    Hey, I just got myself a pair of LSi9's to add to my system.

    My system includes Denon 3805, Denon DVD 2910, Pair RTi8, PS-505, and CSW MC300 center.

    Will my reciever be able to push the LSi's?
    Does it matter that the LSi's are 4 ohms and the others are 8 ohms?
    Should the LSi's be front and RTi's back?

    Thanks

  2. #2

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    Congrats on your new speakers. Do a search on LSI's & receivers, you will find a ton of information.

    The short answer is, don't blast your speakers or you will throw your receiver into protect mode & start saving for a separate 2-7 channel amplifier to properly power your speakers.

    Also start saving to upgrade the RTI's over to LSI's. They are terribly mismatched right now.
    Sunfire TGP III PrePro, Sunfire Cinema Grand Signature 405wpc 5 ch. Amp, Rotel RCD-1072 CDP, Onkyo TA2600 Tape Deck, Pioneer Elite 47-A DVD, Sony 32" XBR TV, Polk RTA-8T Main Speakers, Boston VR-920 Center Channel, Boston PV-600 Subwoofer, Polk DSW 400 Subwoofer, Polk FXi-3 Surround Speakers

  3. #3
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    cfrizz, thanks for the comments but I don't think you adressed my question. The long and short of it is, I don't think I want a seperate amplifier, I am just wondering if my AVR will power the LSI's. If not, will an AVR in the range of 170 watts do it? If not again, how do I go about hooking up a seperate amplifier to push them from an AVR?

    Thanks,

    SW

  4. #4
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    She did answer your question, this subject with your exact receiver has come up numerous times. Use the search feature and you'll find copious amounts of info regarding your receiver, powering LSI's, and connecting a seperate amp to the 3805.
    9/11 - WE WILL NEVER FORGET!! (<---<<click)
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  5. #5
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    Thanks Fran,

    How are the Bronkos doing? I tried the search but nothing comes up. What am I missing?

  6. #6
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  7. #7

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    Quote Originally Posted by swchma
    Hey, I just got myself a pair of LSi9's to add to my system.

    My system includes Denon 3805, Denon DVD 2910, Pair RTi8, PS-505, and CSW MC300 center.

    Will my reciever be able to push the LSi's?
    Yes, but not very well. You might as well stick with the RTi's if you are not going to upgrade the receiver or add on an amp

    Quote Originally Posted by swchma
    Does it matter that the LSi's are 4 ohms and the others are 8 ohms?
    If your receiver has a 4/8 ohm switch, put it on the 4 ohm setting. DO not crank the system too loud or risk putting the receiver into protect mode/damaging the speakers.

    Quote Originally Posted by swchma
    Should the LSi's be front and RTi's back?
    If you must mix the two series, then yes. But if I were you I would not put these two series in the same HT setup. Keep might keep your RTi series for HT and start a separate 2 channel rig.

    Thanks[/QUOTE]

  8. #8
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    To all that replyed, thanks for the great comments, You all gave me something to think about. I reseached adding an amp to my system and in doing so I discovered that I can bi-amp my 3805 to deliver 240 watts to the front speakers since I don't utilize my back surround. Given this, will I be able to push the LSI's as they should be? Thanks.

  9. #9
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    Maybe for a while.Your receiver simply isn't rated for output into a 4 ohm load. From page 101 of your manual...
    2 Audio section
    • Power amplifier
    Rated output:
    Front: 120 W + 120 W (8 Ω/ohms, 20 Hz ~ 20 kHz with 0.05% T.H.D.)
    160 W + 160 W (6 Ω/ohms, 1 kHz with 0.7% T.H.D.)
    Center: 120 W (8 Ω/ohms, 20 Hz ~ 20 kHz with 0.05% T.H.D.)
    160 W (6 Ω/ohms, 1 kHz with 0.7% T.H.D.)
    Surround: 120 W + 120 W (8 Ω/ohms, 20 Hz ~ 20 kHz with 0.05% T.H.D.)
    160 W + 160 W (6 Ω/ohms, 1 kHz with 0.7% T.H.D.)
    Surround Back: 120 W + 120 W (8 Ω/ohms, 20 Hz ~ 20 kHz with 0.05% T.H.D.)
    160 W + 160 W (6 Ω/ohms, 1 kHz with 0.7% T.H.D.)
    9/11 - WE WILL NEVER FORGET!! (<---<<click)
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  10. #10

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    Frank Z brings up a very good point. A good many of today's AV recievers simply do not handle 4 ohm inputs very well. It costs extra money to design amp sections that handle 4 ohm loads. Some manufactures (such as Yamaha, Sony ES, etc) have a 4 ohm/8ohm switch on their recievers to handle this. Bottom line is, if you want to keep going with LSI, at some point, you will need a AVR that accomdates 4 ohm speakers.
    Last edited by frreo1; 09-15-2006 at 10:06 PM.

  11. #11

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    Frreo1 & Swchma, I suggest you both do some serious research about the capabilities of receivers driving 4 ohm loads otherwise you are going to hurt your receivers & possibly blow out your speakers.

    Frreo you read Frank's statement all wrong. Do a search here on the forum & get the facts. I'll even repost the links he gave further up!

    http://www.polkaudio.com/forums/sear...earchid=460244
    http://www.polkaudio.com/forums/show...ght=Denon+3805
    http://www.polkaudio.com/forums/show...ght=Denon+3805
    http://www.polkaudio.com/forums/show...ght=Denon+3805
    Sunfire TGP III PrePro, Sunfire Cinema Grand Signature 405wpc 5 ch. Amp, Rotel RCD-1072 CDP, Onkyo TA2600 Tape Deck, Pioneer Elite 47-A DVD, Sony 32" XBR TV, Polk RTA-8T Main Speakers, Boston VR-920 Center Channel, Boston PV-600 Subwoofer, Polk DSW 400 Subwoofer, Polk FXi-3 Surround Speakers

  12. #12

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    Oops, I forgot to add the word "not". I edited the post. My bad. I accidently typed it wrong.

    No, I did not read his post wrong. If you read the entire comment, it stated that he will need to get a reciever that can handle 4 ohms. Please read the entire thread before becoming critical. I'll take the hit for editing.

    Happy Listening!
    Last edited by frreo1; 09-15-2006 at 10:22 PM.

  13. #13

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    Nowhere in any of Frank's comments is he recommending getting a receiver that can handle 4 ohms. He knows better. You are the only suggesting that route.

    The rest of us know that a receiver should ONLY be used as a preamp when running LSI speakers. You need separate amplification to minimize risk of damaging the speakers & getting the best out of them.

    However, it's not my equipment or money being put at risk so please do whatever you like.
    Last edited by cfrizz; 09-16-2006 at 03:52 PM.
    Sunfire TGP III PrePro, Sunfire Cinema Grand Signature 405wpc 5 ch. Amp, Rotel RCD-1072 CDP, Onkyo TA2600 Tape Deck, Pioneer Elite 47-A DVD, Sony 32" XBR TV, Polk RTA-8T Main Speakers, Boston VR-920 Center Channel, Boston PV-600 Subwoofer, Polk DSW 400 Subwoofer, Polk FXi-3 Surround Speakers

  14. #14

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    Talking

    Quote Originally Posted by cfrizz
    Nowhere in any of Frank's comments is he recommending getting a receiver that can handle 4 ohms. He knows better. You are the only suggesting that route.

    The rest of us know that a receiver should ONLY be used as a preamp when running LSI speakers. You need separate amplification to minimize risk of damaging the speakers & getting the best out of them.

    However, it's not my equipment or money being put at risk so please do whatever you like.
    You mean to imply that a Sunfire, Yamaha Z1, Z9, or a Sony DA 9000 ES receiver (as examples, there are others such as Krell. Mcintosh, etc) cannot handle 4 ohms? That is your opinion, but it is not fact. I think the engineers that make those receivers would beg to differ on your opinion. For crying out loud, the DA 9000 was demonstrated when it first came out at the trade shows with Wilson's, which are a more demanding load than the LSI's. Need to be careful about absolutes like that.

    Now if your point is the fact that LSI's need a beefy amp stage, agreed. To state that no receiver can accomplish the task is nonsense. I am sure you know better.
    Last edited by frreo1; 09-16-2006 at 05:59 PM.

  15. #15

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    I spit on receivers.
    'Political Correctness'.........defined

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  16. #16
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    Yes, I agree that there are recievers that are built to handle a 4 ohm load and some of them may infact be worth the investment. Will they perform as well as a system that uses a stand alone amp? To my ears, not really. The differences to others may range from very slight to "OMG!!"
    9/11 - WE WILL NEVER FORGET!! (<---<<click)
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  17. #17
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    So great, everyone has an opinion on how best to run my new LSI's. As you can infer, I am new to this so treating me like a novice is fine but that is why I am asking for help. 8 ohms vs 4 ohms??? Why are my RTI8 so much inferior to my RTI9? How can I handle both with an amp or more powerful reciever?

    Thanks, gotta piss

    SW

  18. #18

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    Quote Originally Posted by swchma
    Why are my RTI8 so much inferior to my RTI9? How can I handle both with an amp or more powerful reciever?

    Thanks, gotta piss
    Your RTi8's are 8 ohm loads, your LSi9's are 4 ohm loads. 4 ohm loads are harder to drive than 8 ohm loads, so you really need an AVR or separate power amp that is rated to drive 4 ohm loads. It's got nothing to do with watts per channel. As for the suggestions that the speakers should not be used together, that would be because they are not a timbre match. The sonic signatures are different and will sound odd when used together. Making sense yet?

    I gotta take a dump now.
    'Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."

  19. #19

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    Quote Originally Posted by F1nut
    . It's got nothing to do with watts per channel.
    Praise the Lord and pass the black eyed peas.

    Your word of the day is Amperage as it relates to current flow. Also you should buy some tube gear but that is another story.

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  20. #20
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    All the great responses are appreciated, excpecially yours F1nut. It's reassuring to hear that the only good evaluation of systems is in a forum like this and having to be updated on your digestive system is a plus. My guess is that you were, or still are a highschool nerd with nothing to speak for in the zipper department so you comment on a blog to make up for it. AM I correct???? I thought so. Get a life.

  21. #21

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    Quote Originally Posted by swchma
    All the great responses are appreciated, excpecially yours F1nut. It's reassuring to hear that the only good evaluation of systems is in a forum like this and having to be updated on your digestive system is a plus. My guess is that you were, or still are a highschool nerd with nothing to speak for in the zipper department so you comment on a blog to make up for it. AM I correct???? I thought so. Get a life.
    Too funny.

    One thing for sure, you should stay in school as your spelling leaves a lot to be desired, your manners are atrocious and your character judgement is about as far off base as it gets.

    As for me, way back when I was in high school I was doing your mother, tell her I said hi.
    'Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."

  22. #22

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    I have a rubber suit with zippers.

    RT1
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    Onkyo-TX-NR5007
    B&K 7270 amplifier
    Polk SWA-500 Subwoofer amplifier
    OppO BDP-83
    Pioneer Elite 50"
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    Subs-Twin Polk CSW200
    HTS5000


    RABBIT HOLE RIG
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    BillyBags Rack
    MIT S1/3 cables
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    Everthing Matters...Tubes Rule...and It's Over until it's Not Over

  23. #23
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    Cool, so you enjoy doing dead people?

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    You're a moron. If she was dead back then, you wouldn't be here, would you putz boy!?!
    'Political Correctness'.........defined

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  25. #25
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    Not worth a response...Respect is earned, obviously you need to go back to school and finish this time.

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    Quote Originally Posted by swchma
    Not worth a response...Respect is earned, obviously you need to go back to school and finish this time.
    I love it, you keep proving my point that you're a moron. Let me clue you in, if you really felt my previous comment wasn't worth a response then you wouldn't have responded, period.

    As far as respect, you were shown respect by the members that answered your questions including myself and you received a lot of good info, although it would seem you're too thick headed to realize that. It was you that failed show any respect for those trying to help you and in turn will not get any further respect from myself nor any of the other good folks here. So, don't you dare talk about respect when you haven't a clue as to what it means.
    Last edited by F1nut; 09-23-2006 at 01:03 AM.
    'Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end."

  27. #27

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    I, too, have a Denon 3805 driving LSi9s in the front. It also drives my LSi7s in the rear and a LSiC. I've had this set up for about a year without using an amp. Everything has been working well so far, but...

    That said, I fully recognize and respect the opinions of most on this forum that I am doing it wrong and that I, too, should be using my 3805 as a pre-amp and powering my LSis with a real amp. (I think I was a little too greedy when I set up my system a year ago and went overbudget and therefore left the amp out of the picture).

    Now I am ready to start looking into an amp to go between my 3805 and my LSis. I was looking at the Outlaw amp. I'm interested in everyone's opinion as to whether the Outlaw 7125 amp could adequately drive the LSi9 front and LSi7 rears?

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    Hi Dwc! Welcome to Club Polk.

    The answer is subjective. My standard reply is: For any & all of the LSI's I would START at 200wpc & go up! That will give you the biggest improvement & you just won't ever have to worry about having enough headroom for explosions or crescendos in music ever again!
    Sunfire TGP III PrePro, Sunfire Cinema Grand Signature 405wpc 5 ch. Amp, Rotel RCD-1072 CDP, Onkyo TA2600 Tape Deck, Pioneer Elite 47-A DVD, Sony 32" XBR TV, Polk RTA-8T Main Speakers, Boston VR-920 Center Channel, Boston PV-600 Subwoofer, Polk DSW 400 Subwoofer, Polk FXi-3 Surround Speakers

  29. #29

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    Thanks for the quick response, cfrizz. I have a follow-up question if you don't mind educating a novice a little more...

    In the specs for the Outlaw 7125, it indicates it has an output of 125wpc @ 8ohms and 190wpc @ 4ohms. Would I be correct to evaluate amps in terms of what they deliver @ 4ohms because that is what my LSis are? In other words, should I consider the Outlaw 7125 to deliver 125wpc for my LSis or 190wpc for my LSis?

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    it will be the latter.
    I smell ass, burning ass, glowing cherry red spanked ass.

    RT1

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