Crossover Output Invert Recommendations
The Crossover filters generate phase shifts dependent on Filter Type and Slope. For correct combination of frequency components, the Output Invert buttons must be set correctly as described below.
Butterworth Filter Type
|
Filter Slope |
Band 1 Polarity |
Band 2 Polarity |
Band 3 Polarity |
Band 4 Polarity |
Combined Response |
|
6dB/Octave |
+ (Off) |
+ (Off) |
+ (Off) |
+ (Off) |
0dB 0° |
|
12dB/Octave |
+ (Off) |
- (On) |
+ (Off) |
- (On) |
+3dB -90° |
|
18dB/Octave |
+ (Off) |
+ (Off) |
+ (Off) |
+ (Off) |
0dB -180° |
|
24dB/Octave |
+ (Off) |
+ (Off) |
+ (Off) |
+ (Off) |
+3dB -180° |
|
30dB/Octave |
+ (Off) |
+ (Off) |
+ (Off) |
+ (Off) |
0dB -180° |
|
36dB/Octave |
+ (Off) |
- (On) |
+ (Off) |
- (On) |
+3dB +90° |
|
42dB/Octave |
+ (Off) |
+ (Off) |
+ (Off) |
+ (Off) |
0dB 0° |
|
48dB/Octave |
+ (Off) |
+ (Off) |
+ (Off) |
+ (Off) |
+3dB 0° |
|
54dB/Octave |
+ (Off) |
+ (Off) |
+ (Off) |
+ (Off) |
0dB 0° |
|
60dB/Octave |
+ (Off) |
- (On) |
+ (Off) |
- (On) |
+3dB -90° |
Linkwitz-Riley Filter Type
|
Filter Slope |
Band 1 Polarity |
Band 2 Polarity |
Band 3 Polarity |
Band 4 Polarity |
Combined Response |
|
12dB/Octave |
+ (Off) |
- (On) |
+ (Off) |
- (On) |
0dB -90° |
|
24dB/Octave |
+ (Off) |
+ (Off) |
+ (Off) |
+ (Off) |
0dB -180° |
|
36dB/Octave |
+ (Off) |
- (On) |
+ (Off) |
- (On) |
0dB +90° |
|
48dB/Octave |
+ (Off) |
+ (Off) |
+ (Off) |
+ (Off) |
0dB 0° |
|
60dB/Octave |
+ (Off) |
- (On) |
+ (Off) |
- (On) |
0dB -90° |
Only multiples of 12dB/Octave Filter Slope settings are allowed when the Linkwitz-Riley Filter Type is selected.
Bessel Filter Type
There are no simple alignment rules when the Bessel Filter Type is selected or when different filter slopes are used at different crossover points.