Sensitivity Vs. Size, MTM Vs. TMM, and Bookshelf Vs. Tower

[Fidi]

Hi, i have a question.
My question is about placing a speaker horizontal.
What if for example you have to place standard vertical direct radiating speaker horizontal.
What i want to know, is;
Will it influence sound quality(timbre, image,dispersion of sound) by placing the speaker in a horizontal position?
What's the disvantage by placing a speaker horizontal?


And from wich frequency responce can we say that a speaker is a full range speaker.
Short: When can we say that a speaker is a full range speaker, wich minimum frequency response must such a speaker have?

Thank u.