Isophon PSL 300-70

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Tnx p10... I'll have them measured for complete spec , but want to start with 74 l sealed, Qtc=0,707... and try variovent . Any advantage to start with bigger sealed box, 90l perhaps ?
I considered Faital 3fe22 or 3fe25... or Fountec fe85, ...both not expensive, Faital seems better for higher sensitivity....