@57: De pe site-ul Fender se pot descarca schemele tuturor amplificatoarelor produse de ei. Pe marea majoritate apare un text, care descrie modul in care se testeaza puterea.
De exemplu, pentru FM212R (100W la 4 Ohm in specificatii):
"OUTPUT POWER:
Adjast 1KHz input signal to verify 90 Watts RMS at 5% THD into 4 Ohm resistive load at rated line voltage."
Sau, mai detaliat, la Hot Rod Deluxe:
"21.1 V RMS into an 8 Ohm resistive load, or 14 V RMS into an 4 Ohm resistive load, at 5% THD with a 286mV 1 KHz signal applied at J4. Presence and reverb controls full clockwise."
Ori, si mai si, la MH-500:
"1.87V, 1 KHz sinewave input at TP 13.
400W at <5% THD into 4 Ohms resistive load at J5.
1.41V, 1 KHz sinewave input at TP 13.
500W @<1% THD into 2 Ohms resistive load at J5.
Unit at rated line voltage."