The Starlet 4 power requirements state 2x75 watts per speaker, so the 4's may need just as many channels of amplification as the 6's. But then text in the SCT-1.0 test kit description states that the 6's and 9's have separate inputs while not mentioning the 4's. Is the 2x75 watts per speaker requirement mentioned on the site for the 4's an error?

While sloane states that there are [passive] crossovers, the SpeakerCraft site doesn't mention whether or not the Starlets would require active crossovers ahead of the amplification, as the Rogues seem to, or whether both the woofers and the tweeters can be fed full-range but separate signals that may or may not be passively filtered. Assuming that there are existing crossover filters separately for the cones and ribbons in the Starlets, apparently level-matching attenuation was not a part of the design.

I would say that SpeakerCraft needs to do a slightly better job of representing their information - the site doesn't seem to consider the the tech-minded reader.

When one uses an active crossover and connects directly to a driver without passive filtering, level-matching must be accomplished somewhere, either as an adjustment at the crossover or at the amplifier. When bi-amping without the active crossover and without attenuation in the passive crossovers, level-matching would be needed at the amplifier or a separately introduced volume control device.