I absolutely agree with MRTENNIS being a speaker collector. I've tried piezo electric,domes, waveguides, horns etc. but the ribbons, planars and electrostats which I also own are much cleaner than other types of transducers. I hope people get a change to experience the sound of ESS HEILS being used as your high/mid transducer. It is crystal clear with the right kind of gear more so then any other transducer I have heard. The other if you can find it is the add on JANSZEN Z-130 the last model made and the eminent technology. Some ribbon designs are better than others, the same with electrostats, you just have to find a design that suits your equipment. Some of the discontinued or defunct manufacturers made some great transducers but misfortune is the sad part of audio when companies who contribute no longer exist.