A bit of digging turned up an address in Oakland, CA for E.M Long Associates. E.M Long is Edward M. Long, who started Calibration Standard Instruments (CSI). Long also invented Time-Align, which is a method of ensuring that crossovers keep the sound in-phase and coherent. (Bag End is one of the more prevalent Time-Align licensees.)

Long's address (as of November 1995) is E. M. Long Assoc., 4107 Oakmore Rd., Oakland, CA 94602

I was unable to find them listed in the phone book, however.

I did search for him in the USPTO's database and came up with two patents:

#4,481,662 - Method and apparatus for operating a loudspeaker below resonant frequency
#4,361,736 - Pressure recording process and device

The newer patent, issued January 7, 1982, is for what is referred to as ELF, for subwoofers, and was issued to Long (at the same address as I included already) and Ron Wickersham of Santa Rosa, CA. I tracked Ron to this site:

www.alembic.com/family/history.html
www.alembic.com/family/elect.html

Ron would likely be a good source of information, I would guess.

The older patent is for Time-Align, and was issued to both Long and Wickersham (same addresses) on December 7, 1979.

Then, I searched for the address. Apparently, the house has sold at least once in recent years:

www.braudy.com/about/oakmore.shtm

Offered at $749,000 - SOLD FOR $880,000 WITHIN 10 DAYS

Since we know the address doesn't work, I'd try calling Ron Wickersham and seeing what he can tell you.

Incidentally, that was all found with Google in about 15 minutes.