I remember finding a pair of Bose drivers... somewhere around 4" or maybe 5.25" as I recall... that I was told were car audio drivers. Who knows.
Sounds about right. SM and SMPS amps are anathema to the OEM car guys because of the problems with EMI.
I also remember them having markings on them of some crazy low impedance, less than 1ohm I think. Seems like it was 1/2 ohm maybe. I figure they were part of some dismantled factory system where several drivers were connected in series.
The drivers in the 901's are ~1ohm IIRC.
There have been many generations of 901s and the drivers have been everything from soup to nuts particularly in the impedance department.
I can see many non-sonic but very practical advantages to using 8 1 ohm drivers in series to make up an 8 ohm load.
Apart from the application of car audio before SMPS became common and low Z speakers were used to wring as much power as possible out of low supply rails,
I see no advantage at all to really low Z speakers for home use.[/quote]