If you are running 5.1, make sure you stick with a speaker that stays above 6ohms at all times. Yamahas don't like low impedance.
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i was goint to plan on just a left right center set up for ht, but will use mostly for low level music, not foundation shaking, but usually weekends and after the kids are in bed. the rx-v1700 is rated at 130 wpc driving all channels, and dynamic power is 160/255/335 at 8/4/2 ohms respectively.
So I was thinking of kef iq7, or other slim towers...which defe tech mythos were you thinking?
That 335 watts is a "bull___t" rating by Yamaha. Drive five 2 ohm speakers trying to get 335 watts out of each channel and you'll blow the receiver. It will have a stroke running five 4ohm speakers at 1/2 volume. For a pair, you should be ok with any load.
Personally, I'd consider something a little forgiving and easy to drive, maybe paradigm or B&W.
I have a Yamaha RX-V1700 and am driving an older pair of Mirage OM-10 speakers,rated 90db @ 6-ohms that sound great with this receiver. This is the only receiver i have ever had that i did not have to ad a power amp too.
I did leave the Yamaha in its 8-ohm setting with no problems. It does get a little warm if i drive it hard for awhile.
As Elevick said i would look for some Paradigms or another speaker thats rated 90db or higher. Also keep in mind if you get a speaker thats very high db rated,say 100 this will pick up any noise in your system.