High-fidelity oscilloscope

[Lanell]

An electronic device that is overkill or is grossly [over-engineered] for a given task. An example is a 200 [megahertz] [oscilloscope] on your ,000 CD transport to view sound waves that are four orders of magnitude less clear.

Any expensive device bought to improve the performance of a system (not just a sound system), when only a small percentage of the potential of the added on device will be used.