Not necessarily. CONNECTING a physically larger speaker or one that can handle more power (watts) does not guarantee louder volume. This is a huge misconception with speakers. In order to obtain louder volume from an external speaker it must be more efficient than the internal speaker. 

The SP70 will make your FOXPRO game call louder while the smaller 5" external will not. 

If you are using an external speaker with an impedance of 8 ohms you will get the same battery life. If you were to turn off the two internal speakers on an Fusion or CROSSFIRE and just USE an external speaker while running an SP70, your battery life will increase because you are drawing LESS current from the battery when only using one speaker. It is recommended that you shut off your internal speakers when using a large external speaker as they will not be as beneficial to you as the large external speaker. They will be nothing more than a detriment to your battery life. 

Not necessarily. Connecting a physically larger speaker or one that can handle more power (watts) does not guarantee louder volume. This is a huge misconception with speakers. In order to obtain louder volume from an external speaker it must be more efficient than the internal speaker. 

The SP70 will make your FOXPRO game call louder while the smaller 5" external will not. 

If you are using an external speaker with an impedance of 8 ohms you will get the same battery life. If you were to turn off the two internal speakers on an Fusion or Crossfire and just use an external speaker while running an SP70, your battery life will increase because you are drawing less current from the battery when only using one speaker. It is recommended that you shut off your internal speakers when using a large external speaker as they will not be as beneficial to you as the large external speaker. They will be nothing more than a detriment to your battery life.