DIY Supravox speaker set based on 215 Signature, 215 RTF64 or 215-2000 loudspeaker
This type of load is a folded 1/4 wave resonator. Very efficient for mounting broadband speakers. These columns offer very good efficiency in bass reproduction with more precision and less "box noise" than Bass Reflex columns.
The assembly plan below is a suggestion.
The price includes only the speakers.