Question about an AMPS output

[Level33.1]

In an amp the output voltage with any load stays the same, its only the current that changes right?

[HHR Ed]

Actually no. It depends on the topology of the amp though.

Changing the impedance of the load actually changes the acoustic characteristics of the amp and the efficiency.

Usually a lower ohm load will be less efficient at turning the 12v DC power input into its AC voltage output.

Some amps are designed to compensate with firmware that regulates voltage and current. And because a speaker is a reactive load, the exact impedance is always changing and the voltage and current is also always changing at various frequencies.

[SounDigital]

Normally the voltage will try to keep as high as possible, but the lower the impedance the lower the voltage (voltage drop on the power supply).

[Boon]

In an amp the output voltage with any load stays the same, its only the current that changes right?

In an ideal world, yes. But as the current increases the voltage decreases, due to energy losses in the amp, mostly in the power supply FETs due to Rds(on) (the resistance of the FET itself) and the inherent inefficiency of inductive power transformers.