Thanks pkernan. Yes, spendor classic series such as s3/5 have very sweet and open midrange, good for vocal. as well as hard surfaces, the further a speaker is to
a boundary (back wall) it may lose some bass reinforcement (mine is about 7meter distance). it still require a separator or sort of sound diffuser as a fake wall at rear of the speaker. Then put thin carpet to reduce sound reflection due hard surface.