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ASG Enterprise. GSTIN 07AKXPG0658F2ZW
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Upto 30% discount on fredo subwoofers for walk ins @ Delhi Fredo Store. Google Marker https://goo.gl/maps/jTzR99FE5soD821k9
If you have Fredo 8 inch Single Magnet subwoofer, you may go for either of the first 2 screenshot data which you attached with your question.
If you have Fredo 8 inch DVC with you, with double magnet, you may go for the smaller box size as power requirement on amplifier is increased.
Please note a bigger box enhances bass characteristics for the same subwoofer. Box size is kept slightly higher if amplifier power is inadequate/less.
As you move towards more professional AV receivers/Amps, box size can be reduced by few litres for the same subwoofer size.
Hope this explains.