Seeking information on Seattle Sound M4 Speakers

I picked up a pair of Seattle Sound M4 tower speakers at a local Goodwill for $24.95.  There is hardly any info available on Seattle Sound on the internet and what there is references the M1 and M3 models.  The M4's look identical to photos of M3's on line.  With a Marantz CD player, Adcom power amp and B & K preamp, these speakers sound fabulous, better than AR MGC-1, Mcintosh XR-5 and Fourier 6 speakers I've owned.   The highs are crystal clear, the lows are strong and the sound is quite clean and musical and not at all tiring to the ears.  I read that Seattle Sound made about 8 different models including a subwoofer and were in business from about 1987 to 1993. Several of their speakers had an MSRP of $1500.  The M4's are 28.5” high, 10” wide and 12” deep. They weigh about 20 lbs. each. They have 8” Orevox woofers made in Taiwan, 3/4” Vifa dome tweeters, and a 2" rear port.   The woofer magnets say M4 or there would be no way to identify the model.  There is some kind of fluffy batting behind the woofers.  The Model # on the rear label is 401100. The cabinets have black oak veneer and seem solidly made.  I'm changing the banana jack terminals to gold plated.   I know little about crossovers but these seem simple - three capacitors, two resistors and a small white rectangular something.
I would love to learn more about these speakers and the company.   I'm assuming this model is quite rare Any info you could share would be appreciated.