JBL 1514 Manual De Usuario

JBL Grand Touring Series GTO
subwoofers are available in two 
different configurations: a single 
4-ohm voice coil or dual 4-ohm 
voice coils. You may use GTO 
subwoofers in singles or multiples 
to maximize the power available
from your amplifier(s). To achieve
the maximum amplifier output 
possible, you should design a 
speaker system that provides 
the lowest impedance that your
amplifier will drive safely. When
designing a subwoofer system, 
consider the following rules:

1. Do not mix different subwoofers

or enclosure types in the same
system. Subwoofers being used in
the same enclosure or powered
by the same amplifier should 
be identical models. Mismatched
woofers and enclosures can
result in poor performance from
your subwoofer system.

2. You may connect the coils of a

dual-voice-coil woofer in series,
but we recommend that you avoid
connecting separate woofers in
series. 

3. You must use both coils of a dual-

voice-coil woofer connected
either in series or in parallel.

4. Most amplifiers deliver exactly

the same amount of power
bridged into a 4-ohm load 
as they do running a 2-ohm 
stereo load.

To design a subwoofer system 
that maximizes available amplifier
power, keep the following rules 
in mind: 

1. The total system impedance 

of woofers in parallel can be 
calculated using the formula:  

Impedance =

1

1

+

1

+

1 ...

w

1

w

2

w

3

where w is the nominal 
impedance of the woofer.

2. The total system impedance 

of voice coils (or woofers) in
series can be calculated using
the formula:

Impedance = w

1

+ w

2

+ w

3

...

The diagrams at right show parallel
and series speaker connections.