GringoPost | Ecuador: What is the airline definition of a checked bag?

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What is the airline definition of a checked bag?

 I'm a singer songwriter and I have an audio setup I use in my performances. I am contemplating getting custom cases built for them so I can check them as luggage. They weigh about 70 lbs, cases and all. Will I have issues checking them?
Blessings and Balance

Ernest Whaley