In article , SR
wrote:

I am interested in learning more about Quadraphonic stereos and it's music.

Stereos usually had 2 speakers.

But if the stereo had four speakers or more, did that makes it Quadraphonic?

To know if the stereo was Quadraphonic, must the word Quadraphonic be
mention in the manual? -Describing it as a Quadraphonic Receiver?

this one is said to be quad:
for sale ...

Realistic receiver http://www.kapaza.be/detail/3528863/