Yamaha Z9 set at 6 ohm or 8 ohm for Lsi25

sniper6868
sniper6868 Posts: 15
edited September 2009 in Basic Hookup/Wiring Questions
The Lsi25 is 4 ohm speaker. Yamaha Z9 can set for speaker out put at 6 ohm or 8 ohm, what should i set for Yamaha Z9 when it's running Lsi25 ? set at 6 ohm or 8 ohm is better ??? thanks
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  • obieone
    obieone Posts: 5,077
    edited September 2009
    Neither. You can try it @ 6 ohms, but don't crank it.
    I refuse to argue with idiots, because people can't tell the DIFFERENCE!
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  • John K.
    John K. Posts: 822
    edited September 2009
    Sniper, despite the suggestions in the manuals, the lower impedance setting on a receiver should never be used. This in no way optimizes the amplifier for a speaker rated at a lower impedance, as is sometimes imagined. This setting simply reduces the voltage output that the receiver power supply is capable of, and is a type of fire safety precaution required by U L(Underwriters Laboratory). When the voltage is reduced so is the current(following Ohm's Law, I=E/R) and the power output which results. Tests by Sound&Vision Magazine typically show that the maximum power capability is roughly cut in half when the lower impedance setting is applied. So, although the chance of overheating is reduced, so is the maximum performance capability. This increases the possibility of damaging the speaker when clipping occurs because of the lower maximum power capability.

    The amplifier in the Z9 is quite powerful and can power your Lsi25s to very high levels when operating at full capacity. Leave the impedance setting at 8ohms.
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  • Face
    Face Posts: 14,340
    edited September 2009
    John K. wrote: »
    The amplifier in the Z9 is quite powerful and can power your Lsi25s to very high levels when operating at full capacity. Leave the impedance setting at 8ohms.
    And when your receiver goes into protect mode or you blow a tweeter, you can blame this idiot.

    You need an amp, plain and simple. Your Yammie can drive them, but not to reference levels. I'd be conservative with the volume for the time being.
    "He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you." Friedrich Nietzsche
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  • nooshinjohn
    nooshinjohn Posts: 25,648
    edited September 2009
    +1 to what Face has to say. The Yammi is nice and you have one of their very best, but the LSi25's require much more juice than it can deliver. Get yourself a good Power amp to drive them and you will be quite pleased.
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
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  • Unknown
    Unknown
    edited September 2009
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  • nooshinjohn
    nooshinjohn Posts: 25,648
    edited September 2009
    I blelieve the Sunfire TGR401 will be about the only reciever truly capable of doing a proper job of driving a 4 ohm load, all channels driven. I know the high end Pioneers are capable to an extent, but my experience with Sunfire leads me to conclude that they can get the job done.
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
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  • Unknown
    Unknown
    edited September 2009
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  • apphd
    apphd Posts: 1,514
    edited September 2009
    sniper, did you go with the FXi for surrounds? As was discussed in your other thread, you may need to pick up a 3 ch amp. Leave the setting on 8 ohms, make sure the AVR has plenty of room to breath, use the powered sub in the Lsi25 and stay conservative with the volume. After you give it a try you will be able to decide if you need the amp. The LSi won't sound their best until you hit them with power, but you may be happy with them and the Z9 by itself. If you drive it to clipping or into protect mode, then you need the amp, or need to sell the LSi.
    Just my $.02 which most will disagree with, for good reason, but as I said before the Z9 is one of a few mass market AVRs worth giving a try.
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  • nooshinjohn
    nooshinjohn Posts: 25,648
    edited September 2009
    Kex wrote: »
    I'm not sure how you arrive at that conclusion, but I certainly beg to differ! Any NAD will drive a 2 ohm load, and they are all rated for it (not just 4 ohms). They have also been measured to exceed their specifications in this regard during testing. ..

    I arrive at that conclusion based upon the fact that the Sunfire receivers use exactly the same amplification that is inside their separate amplifiers, and they have no difficulty in pushing 400wpc to a 4ohm load at all channels, and will do so without breaking a sweat. Have I experience first hand with them, no, but I do run a Cinema Grand in my rig that has never been phased by my LSi-15's running at full volume for extended periods of time, and with 800wpc on tap to a 4ohm load.:)
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
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  • sniper6868
    sniper6868 Posts: 15
    edited September 2009
    Thanks Jonh K . I keep the set up is 8 ohm and the Z9 run Lsi25 very good, the sound is perfec for me. Z9 can drive Lsi 25 in maximum level. thanks everyone here
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  • apphd
    apphd Posts: 1,514
    edited September 2009
    sniper, glad you are enjoying:) But again I would caution you on: "Z9 can drive Lsi 25 in maximum level"

    If you mean drive them to a loudness level you are happy with using a moderate output level from the Z9, then you should be set.

    If you mean you are driving the Z9 to the maximum output it has, you are asking for trouble.
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  • wutadumsn23
    wutadumsn23 Posts: 3,702
    edited September 2009
    +1 on apphd's warning, that Z9 may be a beast, but be careful it's not bulletproof. Would be a pretty pricey thing to have to replace. The 25's are a hard speaker to keep happy without an amp at high levels. Things may seem ok at first, until it's too late. Enjoy.


    -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)
    Polk Audio Monitor 10A's :cool:

    It's not that I'm insensitive, I just don't care.. :D
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  • sniper6868
    sniper6868 Posts: 15
    edited September 2009
    Thanks Apphd, good to see you here !
    i have a little problem with shipping, can't get the Lsic and Micropro 2000 subwoofer, so i can only test the Z9 with Lsi25 for now. After a week try the Z9 and lsi25 ( not only me, i invited some of my friend ) all we can say it, the Z9 did really good job with Lsi25, we listen from classic, jazz , to hard rock. believe me, Z9 + Lsi25 never let you down with clear sound.
    Yamaha Z9: Minimum RMS output power : 20Hz to 20kHz, 0.015% THD, 8 ohm ...170 W
    Dynamic Power (IHF): 8/6/4/2 ohm . . . . . . 210/260/340/580W
    out put power set at: 8 ohm
    i keep tone control at natural: Bass control: -6 to +6 : keep at 0
    Treble control: -6 to +6 : keep at 0
    Set up for Lsi 25 subwoofer: volume control and frequency adjustment at factory setting
    they blow up my house (and my neighbour house also) with clear sound. I will be back after i have all system for with Yamaha Z9, Lsi 25, lsic , Fxi A6 (x2 pair), Fxi A4 (presence) and MicroPro 2000 subwoofer. Thank again.
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  • curved
    curved Posts: 664
    edited September 2009
    Sniper, that is one nice reciever....try to make it last and get an amp.
    Living Room:....................[HTML] [/HTML] Zone 2 (Workout Room):
    AVR - Yamaha RX-V757......JBL 4312 Pro Monitors
    Pre - Nak CA-5
    AMP - Adcom 555 (Main)
    Main - Polk RTI8**/RTiA5
    AMP - Adcom 545II (Center)
    Center - Polk CSiA4**
    Sub - Snell Basis 300:p......Zone 3 (Outside)
    CD - Yamaha CDC-555.......Def Tech AW5500
    TV - Pani TH-42PZ80U
    BR - LG BD390
    Monster HTS1600 Power Center
    Dedicated Circuit - (2) 20amp, (1) 15amp
    Ben's IC, Canare 4S11
    **Dayton and Sonicap Caps with Mills Resistors**
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  • Ricardo
    Ricardo Posts: 10,636
    edited September 2009
    nooshinjohn wrote: »
    but I do run a Cinema Grand in my rig that has never been phased by my LSi-15's running at full volume for extended periods of time

    Really? You have run your speakers at full volume for an extended period of time?
    _________________________________________________
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    Thank God for different opinions. Imagine the world if we all wanted the same woman
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  • nooshinjohn
    nooshinjohn Posts: 25,648
    edited September 2009
    Ricardo wrote: »
    Really? You have run your speakers at full volume for an extended period of time?
    I have my Yammi set to never go beyond the "0" db mark, and yes, when I am working out in the yard I crank it all the way up, sometimes running through 4 hours worth of cd's on the changer.:D
    The Gear... Carver "Statement" Mono-blocks, Mcintosh C2300 Arcam AVR20, Oppo UDP-203 4K Blu-ray player, Sony XBR70x850B 4k, Polk Audio Legend L800 with height modules, L400 Center Channel Polk audio AB800 "in-wall" surrounds. Marantz MM7025 stereo amp. Simaudio Moon 680d DSD

    “When once a Republic is corrupted, there is no possibility of remedying any of the growing evils but by removing the corruption and restoring its lost principles; every other correction is either useless or a new evil.”— Thomas Jefferson
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