Passive sub - ESX VS 1100P

guys I am totally new to car av; my dad sent me a link and wanted to know if this passive sub is any good/worth its price (250 euros) https://esxaudio.de/vs1100p.html anyone with experience can tell me?

its a esx - vs1100p i have never heard of that brand

do you have any other decent passive sub recommandations under $500 ?

since its not my own question, I just want to know if this is good or bad or if there a better alternatives in the passive sub category