The E-155 is a bass musical instrument speaker, light weight cone, really fast transient snap, very clear and articulate sounding, but not the deepest bass. But what you get is GOOD bass.
Thats what we used to use in the scoops. They are good for horn loading, but I advise to be careful what you do with them, as music was much different when these were being made and used.
Very efficient, 300w power handling, musical sounding bass woofer.