Can't comment on the Spendor since I have not heard them. I do use the 3.6's and I can recommend the 3.7's very highly. A caution on the 3.7's however, you need a very powerful, high current cable amp to get the best from them and they should be set at least a couple of feet from the back wall to produce the best sound stage. Actually, four to six feet would be best.
I've listened to hundreds of speakers over the last 30 years and I don't think that you can beat the 3.6's or 3.7's for the money overall. They are not perfect, but they are exceptional in almost every way!
I've listened to hundreds of speakers over the last 30 years and I don't think that you can beat the 3.6's or 3.7's for the money overall. They are not perfect, but they are exceptional in almost every way!