The AS-121W-1, released in 1970, was the first update to the AS-121W which was released in 1970 and was the top of the line model for 1W line of speakers.
Changes included an updated woofer, an updated tweeter, and the grills were nailed on.
RCA Input Jack
Adjustable crossover point of +/-3dB for the Tweeter (High/Normal/Low)
Adjustable crossover point of +/-3dB for the Mid-range (High/Normal/Low)