The 604's are out of the famous UREI studio monitors (before JBL bought UREI).
They put their own horn and crossover on the 604.
BTW: The foam around the horn was supposed to damp HF reflections that wrapped around and bounced off the woofer cone . . .
The 1593A is a standard model that someone has replaced the two control knobs.
I have a 1593A data sheet . . .




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