Solved! Same amplifier power with same power, different size speakers

[cinilaknedalm]

I got an 120w amplifier. What would sound louder/better connected to it: a 150w (rms) 6.5" subwoofer or 8" 400w (rms) subwoofer?

 

[jsmithepa]

With subs, u wanna have the largest driver possible, that's it. 6.5" sub is barely a sub.

 

[americanaudiophile]

That would depend on the efficiency of the speaker/cabinet combination. I would guess that the 8" will play louder than the 6.5: especially if the 8" were in a larger cabinet.