Sundown Audio SFB 3000D - Subwoofer Series;Parallel Wiring; Subwoofer Planning Chart

SFB SERIES AMPLIFIER OWNER’S MANUAL version 01/21 v2
Subwoofer planning
When using more than one subwoofer, you have to make sure your total impedance does not go below the
minimum level of the amp, see the specification charts for your amplifiers minimums. Use the chart below to
help in your design.
Coil Impedance
D
4
D
2
D
1
Number of dual
coil subwoofers
2
4.00
2.00
1.00
3
2.67
1.33
0.67
4
2.00
1.00
0.50
5
1.60
0.80
0.40
6
1.33
0.67
0.33
7
1.14
0.57
0.29
8
1.00
0.50
0.25
Safe for use where the minimum
impedance is 2Ω and up
Safe for use where the minimum
impedance is 1Ω and up
DO NOT USE
Impedance is too low
SERIES/PARALLEL WIRING OF DUAL COIL SUBWOOFERS