But, I know the Maraschino specs list "2.4v for 230w into 4ohm". The actual max output is 250w into 4ohm, so I'm guessing they actually prefer closer to 3v?
The Maraschino is rated for maximum output at 3.1v. However, input sensitivity ratings are done use 1 kHz sine waves. It takes a lot more output capability from a DAC to drive an amp to full power when using music or movie content.
You don't need to know the impedance of anything to figure out how much more maximum output you will get with a higher powered DAC. 2v is +8.2 dBu. You can use this
calculator. Most balanced DAC's will output between +18 dBu to +24 dBu. I use +20 dBu with my Maraschinos. This is 11.8 dB more than you are able to output.
To figure out what you get with a different output you do the following:
1. Convert maximum output voltage of DAC to dBu.
2. Subtract the 8.2 dBu (your current DAC) from the dBu output of the higher voltage comparison DAC
3. The number you get is the actual decibel level increase you get with higher voltage
Meyers Sound is the only company I have seen that provides the proper specs. Here is an example of what they say on their amps:
Nominal Input Sensitivity +10 dBV (3.2 V rms, 4.5 V peak) continuous is typically the onset of limiting for noise and music
Input Level Audio source must be capable of producing +20 dBV (10 V rms, 14 V peak) . . . to produce the maximum peak SPL
Their input sensitivity is similar to the Maraschino, but you can see that a much higher input level is actually required to reach peak output.