There seems to very little information on Sterling speakers. I know they had a line that included SE 200, SE 300, SE 400, and others. I have the Westminster which may or may not be in the same line.
Who manufactured the Cathedral Sound System by Sterling Westminster Loudspeakers? The cabinets look a lot like Warfedale W70s. Note aluminium dust cap on mid. 15" woofer. 13 x 21 x 24. About 50 lb each. 8 Ohms. Sound compares favorably with many 1960s and 70s end table type speakers. Warm with lots of bite. Not too harsh. Sometimes a bit congested on complex passages. 6 watts will drive them very LOUD, so that plus the ample bass matches class a tube amps well.
I have 2 sets of Warfedale W70 series speakers, the acoustic suspension and the bass reflex versions. And I adore their charming sound. These Westminsters models are just as colored in a pleasant sort of way. Very warm, full bass. Etched 3-D mids. Slightly softened high end that is, none-the-less, quite clear, defined, and musical with nice fade outs for bells and cymbals.