It isn't fishy, it is standard policy with Spectral and well known by everyone dealing with the company's products. With a few exceptions, Spectral amps are built without internal filtering and require the low pass filtering provided by MIT cables to ensure that very high frequencies are not passed to the amplifier. Such frequencies could cause possibly cause oscillation within the amp. It doesn't mean all non-networked cables would pass very high frequencies to the amp, but Spectral has long adopted the policy of insisting on MIT cables, and may refuse to repair the amps if other cables are used and failure occurs. This requirement applies to the back end of the system, not the front end.
