Kim,
I found an old Electro-Voice catalog from the early sixties.
The following are the specs. from the catalog.
The Model 12TRXB -- Combines an SP12B, T35-type VHF driver,
and integral 6db/ high-pass filter with level control.
Response , 35-20,000 cps. Nom. resonance, 50 cps. Crossovers:
2000 cps mechanical and 3500 cps electrical. 60 watts peak.
16 ohms impedance. EIA sens. rtg., 52 db. Magnets: woofer,
1 lb. 6 oz. ceramic; tweeter, 3.16 oz. Alnico V. 12 1/4 " diam.,
11" baffle opening. 7" depth behind panel. Net Wt., 14 lbs.
Net Each ......................................................... $70.00