From the MFSL website:
"1993: Mobile Fidelity continues to test the limits of existing audio technologies with the development of the new GAIN™ System of mastering equipment. This technology affects both analog and digital products from Mobile Fidelity, and has led to startling advancements in the impact of recorded sound. 1994: The company returns to vinyl production with the introduction of the ANADISQ™ 200 LP series, which features half-speed mastering with the GAIN System technology, numbered limited editions, 200 gram super quality virgin vinyl and special heavy-duty jackets with rice paper inner sleeves.
1997: Mobile Fidelity engineers actively investigate several emerging -and competing - audio technologies. Theta Digital upgrades the GAIN™ A/D converter to 24/96 and further research and experimentation is conducted regarding this technology.
1998: Mobile Fidelity creates one of the first 24bit/96kHz DVD's based on audio under the DVD video specification as a showcase technology piece for the CES Show in Las Vegas. During this same period MFSL engineers start research, experiments and testing with the Sony/Philips Direct Stream Digital (DSD) system
Mobile Fidelity prepares for the future and introduces the GAIN 2™ system developed by an
international team of engineers. This system consists of a custom tape head and hand made reproducer electronics achieving unprecedented bandwidth. Synergistically matched to a 2.8 MHz DSD A/D converter and precision down-converted to PCM for Ultradisc II releases. [
accent mine]
1999: Mobile Fidelity releases its first GAIN 2™ Hybrid SACD, Duke Ellington's, Blues in Orbit. Mobile Fidelity's main distributor declares bankruptcy and MFSL Inc. closes it's doors."
Evidently, it was all about the DSD (spelled MQA). The last paragraph is telling, for those cause & effect conspiracists...