Is this Supravox 380mm electromagnetic driver suitable for an open baffle application??
https://www.supravox.fr/en/products/copie-de-380-2000-lc-haut-parleur-de-grave-95db-8-ohms-1
https://www.supravox.fr/en/products/copie-de-380-2000-lc-haut-parleur-de-grave-95db-8-ohms-1
Based on the published data, with a ~170Hz mass corner with the 12v measurement -just, though not absolutely ideal. At a lower voltage, Q is likely to rise making it more suitable, but you'd need to ask Supravox for more data.