2
Connections in parallel
Normally the terminal positive (+) on the subwoofer will be connected to the equally marked
positive (+) on the amplifier, and the terminal negative (-) on the subwoofer to the equally
marked negative (-) on the amplifier.
Only on an inverted subwoofer installation is it normally necessary to invert the connections
(-) and (+).
Calculation of the impedance is (Z), for the given impedance value nominal (R), is 4 ohms.
• 2 subwoofers : 1/Z = 1/R1 + 1/R2 1/Z = 1/4 + 1/4
Z= 2
Ω
• 3 subwoofers : 1/Z = 1/R1 + 1/R2 + 1/R3
Z = 1,33
Ω
Connections in series
Using multiples of subwoofers for such comprehensive installations, it is sometimes better
to connect them together in a series circuit. Using a low impedance load to the amplifier
effectively ensures it will work less hard. For connecting the subwoofers, they are effectively
looped together in any series circuit.
Thus the positive (+) of 1st subwoofer will be connected to the positive (+) of the amplifier.
The negative (-) of the 1st subwoofer will be connected to the positive (+) of the 2nd subwoofer.
Then depending on how many subwoofers are to be included this looping will continue,
until the last (in this basic case the 2nd subwoofer), will have its negative (-) connected to the
negative (-) of the amplifier.
Calculation of the impedance is (Z), for the given impedance value nominal (R), is 4 ohms.
• 2 subwoofers : Z = R1 +R2
Z = 4
Ω
+ 4
Ω
Z = 8
Ω
Connections series and parallel, combined
Depending on your installation amplifier(s), subwoofer(s), various combinations of series
and parallel circuits can be used. The real advantage of doing this is to have a system with
available power, but at the same time to ensure the system impedance load is optimum for
the amplifier(s) used.
Connection diagrams for the 21 V2
POLYGLASS SUBWOOFERS MANUAL
U s e r
M a n u a l
notice sub polyglass 2.indd 2
notice sub polyglass 2.indd 2
16/04/07 15:25:58
16/04/07 15:25:58
