I have a new pioneer receiver which has 4 terminals for the main speakers ( 2 red + for left and right and 2 black - for left and right) . My Technics speakers have for terminals each ( black and red for low level base and grey and Blue for mid and high level). How do I connect them to the receiver?
Do you want to use the speaker's internal crossover, or do you have an external crossover that you want to use?
If you don't care, then just connect the one 'red' wire coming from the receiver to both red terminals on the speaker, and the same for black. Some bi-wired speakers come with an attachment or adapter to accomplish just that.