For resistors I couldn't buy values to get an exact 16ohm load @ 40 watts. Preferably i would like to use metal film ones like Caddocks but they're far far too expensive.

I've managed to find some very old "wirewound" resistors that look something not available at any component shop. The typical ceramic ones I see are rectangle in shape but these ones are round like a spring roll. I can see the wire wrapped around a ceramic roll and dipped in some baked enamel coating. The guy that sold them to me said they were used in old TV/Radios - my guess would be at least 30 years old?

Have you had any experience using these types of conponents? Sonically how do they measure up to higher quality metal film resistors used in passive xover networks?