You may visit the site link I have provided below for information on this speaker. Most likely the Cerwin Vega was used as a cost savings when the original Altec bass driver failed. Neither brand driver in this cabinet will produce flat bass much below 100 HZ.
The Altec driver would be a better match for the crossover circuit and may be found as good used stock or possibly rebuilt.
http://www.audioheritage.org/library/catalogs/altec/images/1971-monitor/page6.jpg
The Altec driver would be a better match for the crossover circuit and may be found as good used stock or possibly rebuilt.
http://www.audioheritage.org/library/catalogs/altec/images/1971-monitor/page6.jpg