I've been tweaking my 3-way crossovers. I reduced the midrange's amplitude by adding a series resistor before the midrange's filter, or at the input side. It resulted in attenuating the midrange level by about 2 dB.
After listening test, I thought there was dominance from the woofer. Therefore, I realized it was required to reduce woofer's operation. As far as I can think, I have two means.
A) Lowering the woofer's cut-off frequency.
I.e., from 300 Hz to 280, 260, 240 Hz, etc., until find the sweet spot, and keep the Q, or product of L and C, as original.
B) Lowering the woofer's knee or Q.
I.e., alter the ratio of L and C to vary Q, but retain the 300 Hz cut-off frequency in its place.
Which one do you prefer?
After listening test, I thought there was dominance from the woofer. Therefore, I realized it was required to reduce woofer's operation. As far as I can think, I have two means.
A) Lowering the woofer's cut-off frequency.
I.e., from 300 Hz to 280, 260, 240 Hz, etc., until find the sweet spot, and keep the Q, or product of L and C, as original.
B) Lowering the woofer's knee or Q.
I.e., alter the ratio of L and C to vary Q, but retain the 300 Hz cut-off frequency in its place.
Which one do you prefer?
Attachments
Here are two comparisons. In both the dotted overlay plots show standard 1kHz LR2 filters with the tweeter at -2dB.
First, pulling down the frequency separates phase.
Second, same frequency lower Q pivots phase through the crossover frequency. The overall dip happens lower in frequency.
First, pulling down the frequency separates phase.
Second, same frequency lower Q pivots phase through the crossover frequency. The overall dip happens lower in frequency.
By simply introducing series resistance to the 'input' of the mid. XO you will achieve
a lower mid. XO frequency, thereby requiring a TWEEK of the woofer XO. ( sort of chasing your tail )
You do have the option of simply incorporating a simple -2dB resistive voltage divider at the mid. input terminals.
This would mean that you don't need to change the woofer LPF.
a lower mid. XO frequency, thereby requiring a TWEEK of the woofer XO. ( sort of chasing your tail )
You do have the option of simply incorporating a simple -2dB resistive voltage divider at the mid. input terminals.
This would mean that you don't need to change the woofer LPF.