I was enticed to build a dual opposed subwoofer, with two SB Acoustic 8" SB23MFCL45-8 , at a 150 eur each, and a Hypex Fusion plate 251, since it can take up to 2,2 ohm impedance output, at 350 eur.
Dual speakers I knew (Rhythmic G25HP, PSA S3010, S3611, Paradigm sub,...) have much higher...