Originally Posted by Will d s
Why don't Mcintosh amps double down? What benefits does this provide?
Usually an amp fails to "double down" when it flat runs out of current.
If you have a very high current, well regulated power supply; then it is going to be able to
produce the required voltage, "come what may", so to speak.
For a given output voltage, when you halve the load impedance; the current has to double
in order to sustain the given output voltage with half the impedance. That's also why the
power doubles, because the output voltage is fixed and you double the current; and the
power is the product of the two.
If the power supply, and/or the rest of the audio circuitry can't double the current when the
load impedance is halved; then it can't "double down". The amp runs out of current at that
particular load impedance.
Unless the designer specifically designs the amp to be able to "double down"; it probably won't.
The ability to "double down" is more the exception than the rule.
The ability to "double down" means that you can run speakers that have low impedances like
It also means that the system will be less susceptible to the variations of the load impedance
with frequency. That is, no matter how the speaker varies its load impedance as a funtion of
frequency; the amp has the current reserves to be able to put the correct voltage on the
speaker terminals, as opposed to being taxed by a low load impedance.