I didn't mean to start anything, but I'm still a bit confused by what I was reading on the Hawg Wired site.
Let's see if we can straighten this out for you...
I know on the SEUC, there is an amp that makes the system more powerful than on the standard Ultra (I'm assuming it's the amp, and not the radio itself).
Yes, there is an amp on the SEUC. Under the Tour-Pak, if I am not mistaken. While the output of the amp is higher wattage (power), it still expects 2-ohm (resistance) speakers.
On the SERG, do you still have this amp anywhere (since the SEUC is under the tourpack),
Nope. No amp on the SERG. No place to put the SEUC amp since there's no factory Tour-Pak.
or is your stereo output the same as a standard Road Glide? Or does this not even matter?
The power output (watts) of the SERG is the same as any stock touring bike. The power output (watts) of the SEUC is higher than stock bikes. However, the resistance (ohms) of the speakers is 2 ohms on all factory sound systems, whether or not there is an amp.
I am very far off from being any kind of expert on this topic and just simply reading what was said on the Hawg Wired site, and the info there seems to point in the direction that there are some differences somewhere along the line.
Hope that helps!