https://www.ebay.com/sch/i.html?_nkw=18+Sound+21+In+Extended+Lf+Ferrite+Audio+Transducer+8+Ohms&_sacat=0&_dmd=2

18 Sound 21-In Extended Lf Ferrite Audio Transducer 8 Ohms

Regular price
$580.00
Sale price
$422.00

* 95 dB SPL 1W / 1m average sensitivity* 100 mm (4 in) Interleaved Sandwich Voice coil (ISV)* 3200W program power handling* 70 mm (2,76 in) peak to peak excursion* Ultra linear dual magnet motor design* Composite reinforced straight ribbed cone