Replacement passive subwoofer for panasonic SC HT-40

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hi guys,recently my brother brought up a panasonic home theater from US,but due to heavy weight of the sub woofer he had left the sub woofer back in US.Now i am going out to make one locally from here,but i am not sure about the power ratings of one to buy(like can i be replace it with 8" or 10" subs,6 ohm or 8ohm etc).Please help me asap.thanks in advance.

Details of the system
Panasonic SC HT 40
AMPLIFIER SECTION
RMS output power of each channel driven
10 % total harmonic distortion
1 kHz front CH 90 W per channel (4 §Ù)
1 kHz surround CH 90 W per channel (4 §Ù)
1 kHz center CH 220 W per channel (6 §Ù)
100 Hz subwoofer CH 220 W per channel (6 §Ù)
Total RMS output power 800 W


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Passive subwoofer (SB-W40)
Type 1 Way, 1 Speaker, Bass-ref.
Speaker unit (Woofer) 16 cm (6
1
/2") cone type, 6 §Ù
Input power (IEC) 220 W (Max)
Output sound pressure level 78 dB/W (1.0 m)
Frequency range 31 Hz to 500 Hz (-16 dB)
38 Hz to 400 Hz (-10 dB)
Dimensions (W x H x D)
182 mm x 392 mm x 266 mm (7
3
/16" x 15
7
/16" x 10
1
/2")
Mass 3.7 kg (8.2 lb.)
 
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