- Star Trek: The Motion Picture
- Star Trek II: The Wrath of Khan
- Star Trek III: The Search for Spock
- Star Trek IV: The Voyage Home
- Star Trek V: The Final Frontier
- Star Trek VI: The Undiscovered Country
- Star Trek Generations
This subspace amplifier allowed Captain Archer and the Enterprise NX-01 to increase the gain and bandwith of their subspace communications. Echo II was deployed along the starship's heading, at key points, in order to acheive the most optimum signal.