So both speakers are rated by the same calculated method (based on available watts & speaker sensitivity) thus both having to factor in things such as power compression. HOWEVER, the ZXa5 is based on half space calculations thus inflating it's end spec results while the FBT is based on free space http://www.fbtusa.net/files/Pro_Maxx...mbined_PDF.pdf thus giving the edge to the FBT. The rated continuous output of the FBT is 127.5db but that is based on free space measurements so it will deliver right on par with the half space calculated measurement of the ZXa5 (a credit to FBT in that they actually list a continuous rating while the ZXa5 only lists it's peak rating) but not have the slight harshness of the ZXa5, the dip in the midrange as the ZXa5, actually offer protection for all it's drivers unlike the ZXa5 & still come in 50% cheaper & not needing the dedicated 3rd party processing to make up for any short comings like the ZXa5.




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