Is 50 wpc SS NAD enough to power Spendor SP1?

Celtic66 nailed it.

To do your Spendors justice, look to a better integrated amp.

For example the last two audio expos I attended had Spendor speakers driven by EXPOSURE electronics and VDH cables .

The EXPOSURE integrated amp will smoke the NAD. I've personally owned the C370 in a prior "B" sytem and know its signature sound, warts and all.

+ 1 to the Celtic66 prompt to look elsewhere.

I owned SP!'s for a long time. You really need a minimum of 100 watts/ch of high quality amp to do them justice.

Neal

SP1 will just work fine. NAD has soft clipping so it can potentially perform as more powerful amp.
None can assume weather you'll like the sound or not till you will try it and see for yourself. It's not hard to sell amp for upgrade when the mean time passes by.

might work fine but they'll never reach there full potential.

I never want to run nothing "less" than 125 watts a side...quality power really is noticeable.

if these are rated at 87db i would think you need more juice, in whatever brand you choose. obviously nad is more affordable so perhaps a larger nad would do.