Si no recuerdo mal te hiciste con una Crown 1502, no?
Si es dicho modleo en la casa dice tiene regulación de sensibilidad de entrada:
Crown XLS 1502 DriveCore™ 2 Series power amplifier — 300 watts RMS x 2 at 8 ohms (775W RMS x 2 at 2 ohms) at Crutchfield.comInput Sensitivity: Input Sensitivity enables you to set the input sensitivity for the optimal system performance. You can choose from:
.775V - High: For sources with inherently low output levels, select this mode to drive the amplifier to full power. Typically, sources that use the RCA connections require the High setting.
1.4V - Normal: For all other audio sources, the input sensitivity should be set to normal
Prueba con ello a ver si hay suerte
Un saludete