Topmusicanswers
the send and return is for the effects loop, if you jack a cord out of the send jack and through some pedals and then back to the return those pedals will work beneath the amps ordinare controls, you can also use the send jack to plug in a recording device as you said.
What is send on an amp?
This specification is easy to understand but is important to choose an amp that will work with the system your local car stereo shop has designed. In the simplest of terms, the sensitivity specification determines how much voltage is required on the input of the amplifier for it to produce full power.
Is send input and return output?
The send jack on the amp would go to the input of a device like a Profex processor. Then, the output from the Profex would "return" to the return jack on the amp. Now your guitar signal will go thru the amp's preamp, out to the Profex, back into the amp, and then to the amp's power amp stage.
How does send and return work?
The FX loop sends the post amplified/equalized signal out of the amp (The SEND jack), and into a pedal of your choosing. That signal is then processed through the pedal and fed back into the amp before the Power Amp section of the amplifier (The RETURN jack).
