SMD DD-1 speakers connected or d/c

[csshakka]

In the manual it states:

"Disconnect all speakers connected to the amplifier. (This has already been calculated into the equation and provides 1- 3dB more gain overlap on unregulated power supply amplifiers and 0dB more gain overlap on regulated power supply amplifiers)."

For some reason this gain overlap isn't clicking with me. If I kept the speakers connected, how will this effect the end result? For example, if I have speakers rated for 100W/ea and the amp does 120W/ea, I would keep them connected while turning up gain, monitor the DD-1 to make sure I don't introduce clipping, but also listen to the speakers to make sure it is not clipping.

Thoughts?

[Sutliff]

Make sure to put some earplugs in ... 1,000Hz Test Tone at max (clip/distortion/etc.) is brutal, & 40Hz, for the constant period of time you'll likely be fiddling around, will become very annoying ... If not to you, then to others around the vehicle.

[csshakka]

Make sure to put some earplugs in ... 1,000Hz Test Tone at max (clip/distortion/etc.) is brutal, & 40Hz, for the constant period of time you'll likely be fiddling around, will become very annoying ... If not to you, then to others around the vehicle.

Yeah I usually use musician's ear plugs or whatever they're called. Makes it manageable and other people around can deal with it for 30 seconds lol. I'm interested in what that 'gain overlap' means in the manual. Does keeping the speakers attached result in you tuning 1-3db higher than you should?