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Connecting Your Subwoofer to Your Amplifier J BL Power Series

JBL Power 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

2. You may connect the coils of a

dual-voice coil woofer in series,

avoid connecting separate

woofers in series. Because 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, connecting separate

woofers in series reduces the

damping factor of the ampliﬁer

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 = 1/(1/w1 + 1/w2 + 1/w3...), where w is the nominal impedance of the woofer.

2.The total system impedance of voice coils (or woofers) in series = w1 + w2 + w3...

The diagrams below and at right show parallel and series speaker connections.

Figure 2. Series connection

RED BLACK

STRIPE STRIPE

POS ( + ) NEG ( – )

POS ( + )NEG ( – )

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).

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.

Figure 1. Parallel connection

RED	BLACK
STRIPE	STRIPE
POS ( + )	NEG ( – )
POS ( + )
	NEG ( – )

P1220II, P1020DII, P1020II, P1220DII specifications

JBL is a name synonymous with high-quality audio equipment, and their line of professional loudspeakers, including the JBL P1020II, P1220DII, P1020DII, and P1220II, showcases the brand’s commitment to delivering exceptional sound performance. These speakers are designed for both live and installed sound applications, making them versatile solutions for various environments.

The JBL P1020II is a 10-inch 2-way speaker that delivers a maximum output of 300 watts. Its compact design makes it ideal for smaller venues or as part of a larger sound system. The speaker features a high-frequency compression driver that provides clear and detailed sound reproduction, especially in mid and high-frequency ranges. The horn-loaded design allows for a wider dispersion of sound, ensuring that audio reaches every corner of the room.

In contrast, the P1220DII is a 12-inch 2-way speaker, also capable of delivering up to 300 watts. This model excels in bass response, making it an excellent choice for genres that require more low-end presence. Similar to the P1020II, it incorporates a high-frequency compression driver and horn-loaded technology, ensuring clarity and a broad sound coverage.

The P1020DII represents a step up in the range, providing not just enhanced power handling but also improved sound fidelity through JBL’s advanced engineering. It is designed with a dual 10-inch configuration, allowing for greater volume levels without distortion, making it suitable for larger venues or outdoor events.

The P1220II utilizes a 12-inch woofer with a new design that enhances durability and performance. This speaker includes advanced materials in its construction, contributing to a lightweight yet sturdy build, which is crucial for both transportation and setup in live sound applications.

All four models feature JBL’s proprietary Differential Drive technology, which offers low distortion and high efficiency. They are constructed with rugged enclosures that withstand the rigors of sound reinforcement in various settings, from concert halls to festivals. The easy-to-mount design facilitates quick installation and teardown, which are essential for touring professionals.

In summary, the JBL P1020II, P1220DII, P1020DII, and P1220II are engineered for optimal sound performance, combining advanced technologies and durable construction. They provide exceptional audio fidelity across their frequency ranges, catering to the needs of both sound professionals and enthusiasts who demand high-quality sound in any situation.