Opinion on Yamaha Amps

One thing to note, the 801 has an impedance switch on the back, to protect it from lower impedance loads. Something like this is generally thought of as cost saving and a compromise.

Any integrated amp worth its weight will be able to drive down to 4 or even momentary 3 ohm loads without issue. None of the Nad integrated amps need or have such a switch, even their entry level C316BEE is rated for 4 ohm loads.

It might be worth considering the Nad C356BEE for this reason, and the fact that all Nad amps have the superior toriodal transformers, not the laminated core design that Yamaha employs in the 801.  Shop Spearitsound as they occasionally have demo models on sale.

While I do totally agree with the NAD integrated amp suggestion, these A-S*01 Yamahas are really pretty solid performers even with nominal 6 and 8ohms speakers with occasional 4ohm dips.  I know the all analog models(A-S1000, A-S2000, etc.) can handle these impedance dips very well.  

As far as the impedance switch, my understanding is to leave at 8ohms 99% of the time.

Bill

The A-s1000 looks to be a big step up in quality over the 801.  Less rated wattage, but 4 ohm rated, which means a beefier power supply.  But for many people I'm sure the 801 would be a worthy contender.  To be honest I've never heard a recent Yamaha integrated, but have owned 3 Nad amps, hence my bias!

I've had an A-S2000 for 2 years. It replaced Pass XP-10/XA30.5. I prefer it, with the same Tannoy Turnberry speakers I was using with the Pass stuff.

I have an A-S 801 and am not sure about it. it seems laidback and a little dry sounding  tried several power cords  My NAD 317 sounds more live with sharper images. I had a Marantz PM 8004 a while ago and wonder how it would compare.  Do not get me wrong the 801 is great just not sure it is good with rock and blues.