Quote:
mike c wrote:
 is the number in red correct? or a typo? |
Yes, it's correct. Since it is being run with basically no crossover, there is output at higher frequencies than the first FR spec. Therefore, the -6dB point (from maximum output) occurs at a higher frequency.
In other words, when you look at the FR plot, the "crossover min" has a maximum output of ~90dB @ about 37Hz. With the "crossover max", the maximum output is greater than before at ~92dB, and occurs at ~73Hz. So to find the "+/- 3dB" range you have to find the frequency which is 6dB lower than maximum.