I carry my rig on the aircraft all the time. You just have to make sure to be ready for a bomb test on the rig after it goes through the xray machine. Also carrying a TSA letter and cypres card also helps.
can we bring our ps3 on hand luggage
No, usually the checked weight is different from the weight of the hand luggage. Check with your airline
are laptops classed as one piece of hand luggage on monarch flights
no
no
Yes, an electric shaver maybe taken in hand luggage on Delta.
No. They are actually separate and they have separate rules as well.
yes
yes
Softside luggage involves the manufacturing of hand-assembled luggage made of synthetic fiber materials and steel or plastic frames
This simply means luggages that can be carried by hand.
Provided they do not exceed the cabinet weight and size limit, in theory yes, speakers can be taken on a plane in hand luggage.