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  1. #1

    Member Sales Rating: (0)

    Join Date
    Oct 2007

    Default Help this Noob assemble a 7.1 system. Will this work?

    I will soon move into a new house and am chomping at the bit to set up a HT. Being a noob at it, I would appreciate any comments, advice, or answers to my questions. I'm assembling from scratch so it's not too late to correct a mistake. It will be a 7.1 system. This is what I want so far...

    1. LSi15 (x2)
    2. LSiC
    3. LSi9 (x2)
    4. LSiFX (x2)
    5. ONKYO TX-NR905
    6. Rotel RMB-1075

    I'm confused by the whole amp thing. Would this have enough power to drive my system? Yes, I know more power is always better but would I be entering into the domain of diminished returns if i stepped up to the Rotel 1090? Or would it really make a noticible difference? Am i missing a vital component (I'm a noob) or making a mistake?

    Would this be a sweeeeet setup? Help me tweek before i open my wallet!

    -also, I live in Alaska and i really Can't go audition this stuff for myself, so i'm left to rely on popular consensus unfortunately.

  2. #2

    Member Sales Rating: (0)

    Join Date
    Oct 2007


    Also, I'm ignorant of the impedence issues. Would this system work with the 4ohm rating of the LSi's, with that extra amp? Will it work quite good or would i need to step up the amplifier?

  3. #3

    Member Sales Rating: (1)

    Join Date
    Oct 2007
    NE PA

    Default I will try to help

    Welcom to the club Hiccups. Sorry I am not very qualified to give much advice, but I'll do my best. I'm surprised no one else has reponded to this. Most times everyone in here are very helpfull with these questions. First the impedance question. My non expert guess would be yes with a little care. This is all from memory from research I did some time ago so...Speaker impedance will vary depending on the signal feeding it. So a 4 ohm rated speaker is not always going to be at a true 4 ohm load. Cheap speakers could drop to 2 ohms or less. The lower the impedance the higher the output from the amp. Do you see how this could lead to a problem? With speakers such as the LSi and quality amplification, as long as you do not get crazy with the volume you would probably be ok. But you might want to try the "Basic Hookup/Wiring Questions" and/or "Troubleshooting" forums on this board, or email Polk and ask them. I used a Denon AVR 2000 rated @80W into 8 ohms to drive a pair of Genesis Physics 320, (very similar specs to the LSi15s) 4 ohm speakers recomended power 20 - 250 W for about 20 years before the foam surrounds gave out. As soon as I get time I will be replacing them and put them back in use. For now I have replaced them with a pair of Polk Monitor 50s. Then I'll probably upgrade from plain and simple Dolby Pro-Logic to a new 6.1 or 7.1 receiver.
    But back to you, I looked at the list price of items on your list (I hope you don't have to pay list for everything in Alaska) but it's obvious you're ready to drop some serious $$. I would say you should be able to have a great sounding sys. in that price range. As far as power I don't think you have any problem there. You are off to a good start by doing some research. You might also want to try or any/all of the numerous forums on line. Most are full of people willing to help especially when it comes to spending other peoples money on equipment. Always someone there to tell you that will be good but for $100 or $300 more you could get a ...... Also search for user reviews on any thing you might be interested in. Just don't base any decisions on one or two comments. Try to find as many as poss. and look for trends or comments good and bad that keep repeating over and over. I have heard many times, "Buy as much power as you can afford" which is probably true. But keep in mind that good CLEAN power cabable of quickly and cleanly hitting short peek requirements is as much if not more important than total raw power. A quality 40W amp can outperform a cheap 1000W amp outputting crap. I just suggest here don't get caught up in the $$ = braggin' rights trap. Also keep in mind that your room size, shape, building materials, furnishing and speaker placement are going to play a part in the end product reaching your ears. IMHO once you hit a certain price range you should look more for reliability, the SQ will be there. I can't hear the difference between a $2,000 system and a $10,000 system, at least not a $8,000 difference. Maybe I spent too much time working under jet aircraft and listening to live rock&roll, but I don't think I ever could. There are some that will tell you they can hear the difference "breaking in" cables will make. They are lucky to have such keen hearing. I'm lucky because I get good sound (to me) at 1/3 of the price and only feel the need to upgrade something every 10 or so years.
    I am confused on why you feel you need the Rotel RMB-1075 amp. I think the Onkyo could do a fine job on it's own. Are you planning on using the Onkyo as a pre-amp, and to drive your rear surrounds? I think the Rotel is a only a 5 channel amp. How big of a room are you looking at? Good luck with your search, and hope you enjoy the new home and what ever you decide on.

  4. #4

    Member Sales Rating: (28)

    Join Date
    Mar 2005
    Right here.



    That would be a sweet setup; BUT, it would be PERFECT with the 1090. The LSi line is very power hungry..nothing wrong with 4 ohms; just need more good power. If you can go for the 1090, you'll avoid the upgrade bug a few months from now.

    Whatever you do, DON'T run them only with the Onkyo.

    Edit: Is that 1090 5 channels? You'll probably want to amplify for all 7 LSi's; there are lots of 7 channel amps out there, or you can get the 1090 and another 2 channel Rotel.
    Last edited by Ricardo; 11-13-2007 at 03:30 PM.
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  5. #5

    Member Sales Rating: (20)

    Join Date
    Mar 2005
    Fifth Ring of the Hot Place


    Yes!Definitely get an amp. That's too much LSI goodness for a receiver.... And welcome.
    Sharp Elite 70
    Anthem D2V 3D
    Parasound 5250
    Parasound HCA 1000 A
    Parasound HCA 1000
    Oppo BDP 95
    Von Schweikert VR4 Jr R/L Fronts
    Von Schweikert LCR 4 Center
    Totem Mask Surrounds X4
    Hsu ULS-15 Quad Drive Subwoofers
    Sony PS3
    Squeezebox Touch

    Polk Atrium 7s on the patio just to keep my foot in the door.

  6. #6

    Member Sales Rating: (13)

    Join Date
    Sep 2007
    Bridgeton NJ


    I will 3rd what Ricardo says but I would also look at Outlaw Amps/ Pre Amps
    HT setup
    Panasonic 50" TH-50PZ80U
    Denon DBP-1610
    Monster HTS 1650
    Carver A400X
    MIT Exp 3 Speaker Wire
    Kef 104/2
    URC MX-780 Remote
    Sonos Play 1

    Living Room
    63 inch Samsung PN63C800YF
    Polk Surroundbar 3000
    Samsung BD-C7900

  7. #7

    Member Sales Rating: (1)

    Join Date
    Jan 2004
    Quincy, MA


    Welcome Hiccups!

    You will have one slamming system. But as others have suggested you should up the amp to a Rotel 1095. Other good amp choices are Outlaw Audio 7700, Any 7 channel amp from Sunfire, or Parasound.

    Once again welcome to club Polk. And when you put it all together...PICS!!!!!
    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

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