Jbl GTO10200 User Manual download pdf (Page 3)

03

JBL GTO Series subwoofers

are available in two different

conﬁgurations: as a single 2-ohm

voice coil or as dual 2-ohm voice

coils. Depending on the ampliﬁers

you are using, you may use either

single-voice coil or dual-voice coil

subwoofers in singles or multiples

to maximize the power available

from your ampliﬁers. To achieve

the maximum ampliﬁer output

possible, you should design a

speaker system that provides

the lowest impedance that

your ampliﬁer is rated to drive

safely. When designing a

subwoofer system, consider

the following rules:

1. Don’t mix different subwoofer

or enclosure types in the same

system (use all single-coil

woofers or all dual-coil woofers).

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. The ampliﬁer-

damping factor (the ampliﬁer’s

ability to control the motion of

the woofer) is expressed as a

ratio of terminal impedance

(the sum of speaker impedance,

wire resistance and the D.C.

resistance of any crossover coil

connected to the woofer) to

ampliﬁer-output impedance.

Therefore, connecting separate

woofers in series reduces the

damping factor of the ampliﬁer

to a value less than 1. This will

result in poor transient response.

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.

Figure 1. Parallel connection

POS ( + )

NEG ( – )

RED

STRIPE

POS ( + )

BLACK

STRIPE

NEG ( – )

Figure 2. Series connection

POS ( + )

NEG ( – )

RED

STRIPE

POS ( + )

BLACK

STRIPE

NEG ( – )

Connecting Your Subwoofer to Your Amplifier JBL GTO Series

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