Going from 2 subwoofers for 4

[Vagomire 10+ year member]

Would there be a large increase in sound adding two more woofers and one more amplifier to my system?

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[CRXBMPN 5,000+ posts]

if you have the right amount of room and electrical capacity to back up the amps then you will notice quite a difference.

 

[Villeza1 10+ year member]

if you have the right amount of room and electrical capacity to back up the amps then you will notice quite a difference.

Agreed