So Amir tries to give as much information and measurements as possible.I have always read that internal PSUs are bad for the signal, due to transformers and such.
I do not know what effect on the signal can be talked about .. I had a lot of equipment with built-in power supplies, and never heard any pickups and other terrible things that reviewers write about in paid reviews.
There are quite a few disadvantages of such power supplies.Why go back to internal ?
1 - The power supply of the L30 is special, with alternating current. It will be very difficult to find replacing.
2 - It is huge and heavy. If you take it on a business trip, you will understand it.
3 - it is transformer, and cannot be used with 120v~240v. This is very important for some people, including me.
I am not against external power supplies, such as laptop. It is lightweight, dont pull the power socket out due to weight, easy to replace and can be used with 120v~240v .
Sorry for my english.