Running 4 speakers from a 2-channel amp

Hifitime - Yes, in parallel that looks bad.

I suppose that amps with an A+B selector option have a different wiring than parallel. I do not notice any change in volume in set A or B when I switch from A or B to A+B, so I suppose there is some degree of separation of the output stages. Mine is an old Japanese amp for which I have no specs.

Would you, or anyone out there, know whether it is true that driving 4 speakers from an amp designed with that option actually causes excess wear on and eventual damage to the amp, as some sales guys (in an amp department - maybe not without motive) told me?

Thank you all for the facts n ideas. It sure cut out a lot of time for me. I'm still thinking about my next move.

Thanks all you ppl for this insightful thread. I had initially thought it a simpler question...

Thank you Renjy651 for that last comment. I can't agree more.

I was very happy to learn that the L 505u can play A+B. People in a shop here said it couldn't. After reading your post I found it can from the Luxman site, and now I have a new possible amp goal in mind. I hope to find some way to listen to it at home.

Tonight I'll go and listen to a used pair of Sonus Faber Concertos (original type, not Homes) at a local shop. I'll be bringing my Luxman 507 and my own CD player (Ah! Njoe Tjoeb 96/24 w/Siemens 7308 gold pin tubes).

The intention is to have nice sounds in my computer room. I almost bought Adam 7 powered speakers, but was talked out of it. I have no idea yet whether the Sonus Fabers might match nicely with my Yamahas (totally opposite approches to sound reproduction, but sometimes such differences synergize), but if I buy these SFs I'll certainly experiment with that.

I love the sound of SF speakers, and I'm thinking it would be nice to have three very different-sounding pairs at home: My Yamaha NS100x's, modified B&W 805Ns, and Sonus fabers. This should cover the spectrum of my own tastes with differing types of music and recording quality.

Just an update in case anyone is interested
I listened to the Concertos and didn't like them much at all. The bass was weak and muffled, they didn't image well, lacked detail, and were very much "in the box." The had a lot of cosmetic damage as well. I compared them to some Quad 12L's, which were in mint condition and at half the price of the Concertos. Originally, i just wanted to use the Quads as a comparator, but I wound-up buying them as a temporary fix until I find something better. Since then I've come to like the Quads more and more, though best within a certain range of genres. I still think of them as temporaries, and I'm looking for some SF Minimas to try next.

In the meantime I bought the very first Japanese version (different mains power) iDecco in Japan, directly from the distributor before they reached the market here. This is an amazingly good unit. I'm using this mainly to listen to flac files streamed from my iMac to my Quads, and it sounds warm and extremely detailed.

I also picked-up a second set of NS-1000x's, a rare walnut set in the best condition I've ever seen these speakers in. I'm thinking of keeping this set for replacement parts, so that I'll always have NS-1000x's in good shape around. The full set here in Japan costs about as much as two used so-so conditioned beryllium tweeters do overseas.