Its possible it was a picture of a 12" speaker, and printed poster sized to make it look 24" or bigger, and an orange color added. I highly doubt that "speaker" is any deeper than the 1" frame its mounted on.
A real 24" speaker in a cab might weigh 200 pounds, require massive wattage due to inefficient specs, and only be good at producing certain frequencies. Remember, the sound you heard was on your TV's 2" speakers, and the tone you heard came from the amp - not the massive orange picture of a speaker.