I am an electronics hobbyist. After reading online my understanding is that an op-amp buffer or JFET pre-amp can be used to match a medium (lower) input impedance with a high output impedance. In my case need high-impedance output with attenuation or reduced voltage.
Sub woofer sounds hard hitting, bass too hard (high) thump at minimum volume in Sub woofer amp (Wharfedale).
For testing I connected line out of MP3 module with 10k resistor, bass response was good, smooth, no hard thumps.
I used resistor divider 42k and 12K, did not attenuate much, and felt it's effecting quality of sound (Low frequency response of subwoofer).
Media player Output:
Output Level / Output Impedance: Subwoofer(30Hz) - 4v / 470ohms.
Subwoofer amplifier line input:
Amplifier Power: 150W RMS
Input Sensitivity 200mV for 75W
Input impedance: 10kΩ
Frequency Response: 35Hz to 110Hz
Requesting guidance choosing from DIY circuits or designing one.