Thank you all for comments and advise.

Actually I was looking for a sub that fits my system, but it was difficult to find one in my country.

Guess I will pass this offer and keep on looking for sub, although it wont be easy.

7200SE or 8000 would be my option after I win the lottery.

DSP: DSP6000.2 MKII, Reviver,
Audio: MS200, Super Linear Power Supply 12V1A, SotM ISO-Cat6
Core+Store: ROON on ROCK