GPA's Vintage Altec E-Zine, Jeff Markwart's Corner
Phase Shift Between Drivers
I acquired a pair of 604Bs in the early 1990s, and had them refurbished with new 604E low frequency (LF) cones and new 16 ohm high frequency (HF) diaphragms at the Altec factory in Oklahoma City, Oklahoma. I subsequently used them with Altec N1500A crossovers for years in a secondary audio-visual system. (Follow the Vintage Altec Lansing N1500A schematic link for a look at that vintage series type crossover) My main system had horn loaded Altec 515-8Gs and 909-8As with custom phase corrected passive crossovers, and the 604Bs seemed to lag behind them in a number of sonic areas. In......
