JBL P1022 Specification Sheet

For more than 60 years, JBL has been delivering

products embodying the technology developed in 

the professional arena – equipping leading recording

studios and movie theaters, as well as live-music

reinforcement in venues ranging from dance clubs to

Woodstock. We continue to transform this expertise 

into products that provide the impact and excitement

of a live performance. The JBL

®

experience is for

enthusiasts who won’t settle for anything less than

“live” at home or on the go.

The JBL Power Series

®

subs and PB1220 enclosure

have been engineered to put you in the front row at

your favorite concert, whenever and wherever you

happen to be listening. They produce deep, solid, tight

bass that can only be delivered by the leading brand in

concert sound. 

KEVLAR

®

-IMPREGNATED-

PAPER WOOFER CONES

This combination has been chosen for its high strength-

to-weight ratio, and is formed using a proprietary

manufacturing process. Its stiffness relieves stress

concentrations that may accumulate at the base of the

cone in high-power and high-pressure applications.

NITRILE-BUTYLENE-RUBBER

ONE-PIECE SURROUND AND

GASKET

This material provides an optimal blend of elasticity 

and internal damping. The size of the roll is optimized 

to offer good long-throw linearity with the proper

amount of control and stability at excursion limits. 

PROGRESSIVE SPIDER

This provides better control at excursion limits than a

linear spider. The benefit is reduced distortion at high

output levels. 

VENTED POLEPIECES

Additional cooling is provided to the motor structure.

The subwoofer’s thermal capabilities are augmented,

increasing power handling. 

SLIPSTREAM PORT

The JBL PB1220 loaded enclosure’s performance 

is superior to that of competing loaded enclosures,

primarily due to the revolutionary Slipstream port. The

Slipstream port provides lots of surface area outside 

the box so that the air stays stuck together – the

engineers call this an “adverse pressure gradient”. 

That gradual change from high pressure to low pressure

eliminates the distortion known as “whacking”. Because

the port’s area in the middle is much smaller than the

mouth of the port, the port can be 

much

shorter than

a cylindrical port. That means the Slipstream port can

fit into regular boxes. Stickiness outside the box is

maximized by increasing pressure, and stickiness inside

the port is minimized by reducing velocity. The benefit of

this technology is more bass output, with greatly reduced

port noise and distortion.