confused:
I was about to replicate the 30923 Equalizer Network as used in the 9846A/B and Biamped 9846BX Studio Monitor as this setup is the same as the mid 70's A7-500 (416-8B, 802-8D /808-8A, 511B and N501-8A) except for the 411-8A woofer. I was surfing this forum and noticed that in the early 80's Altec brought out the N501-8B xover which later became the N8500-8A, evidently these were designed for the A7-500 (416-8C, 902-8T, N501-8B/N8500-8A).
If this is so why are the component values different, especially the 6uF in the 30923 whereas the N501-8B has only 3uF.
The brochure for the 9846 Studio Monitor states that 30923 network suppresses the midband (1-6kHz) frequency response by 2 to 3 dB. Using the 6uF cap would equate to a first order broad frequency peak of 3300 Hz, which is right bang in the middle of the 1-6kHz band.
If the posted schematic of the N501-8B is correct then the first order broad frequency peak is 6500 Hz if using the 3uF cap.

Is this assumption correct?, if not please enlighten me as I want to do the correct EQ network first up.