CBA 250 250 (10) mm (in.) | 500 W | 0.4 Ohm | Active sealed subwoofer box

Hertz CBA 250 active subwoofer box, with the 10-inch driver, features a dedicated high-performance amplification module that enhances all the passive box technologies, such as the 2S²(2 Sides / 2 Sounds) design, the Plug & Play terminal block and ultra-compact size. The SSP (Sub Smart Plug) terminal block is provided with a single Plug & Play connector to be able to disconnect the box easily and safely. The amplification module, with power outputs of 250W RMS, is developed with he-li technology (high efficiency / low impedance), which thanks to the absence of the DC-DC voltage booster reach the impressive 90% efficiency level, very close to the theoretical limit of the D-Class. The Butterworth low pass filter at 12dB/Oct. with variable cut-off frequency (50-200 Hz) can be bypassed, when used with an external processor with pre-out output dedicated to the sub. The adjustable bass-boost control (0 ÷ 6 dB) at 45 Hz allows the user to emphasize the response on the lower side of the spectrum and the Phase control (0 - 180°) completes the equipment. The high-level speaker-in input on the multi-pole connector eases the integration with OEM audio systems while the low-level input on RCA is dedicated to the connection with after-market sources.
Size mm (in.) 250 (10)
Power Handling - Continuous W 250
Power Handling - Peak W 500
Impedance Ohm 0.4
Design Active sealed subwoofer box
Voice Coil Ø 60 (2.36)
Frequency Response Hz 20 - 200
Magnet size D x d x h mm (in.) 140 x 70 x 30 ( 5.51 x 2.76 x 1.81)
Magnet High density flux ferrite
Cone Pressed Paper
Xmech mm (in.) 14.75
Voice Coil Type Copper
Technical Specs
Physical Specs
CBA 250
mm in.
A 440 17.32
B 334 6.97
C 158 6.22
C1 135 5.31
CBA 250
Remote Level Control
CBA 250
  • Butterworth low-pass filter at 12dB/Oct. with variable cutting frequency (50-200 Hz), Subsonic filter, phase control (0 – 180°), and adjustable bass-boost 0÷6 db @ 45Hz.
  • Defeatable filter to use the sub dedicated output of a processor.
  • High-level audio input on multi-pin connector for maximum OEM integration and low level on RCA for aftermarket sources.
  • ART turn on function (Automatic Remote Turn-On) selectable among: Remote-in, Hi-level, Audio signal.
  • Box with ultra-low profile (6.22 in. / 158 mm) in air suspension, designed to take full advantage of the performance of the 10 inch high-impedance driver.
  • Down-firing leveling feet with Velcro inserts included for a secure grip with the carpet, ensuring extreme ease of removal.
  • Rounded corners allow easy placement in the trunk and act as a reinforcement to reduce enclosure resonances.
  • The exclusive design of the cone, dust-cap, and basket geometry to achieve a wide linear excursion (9 mm in one direction), keeping the depth required for the assembly to a minimum.
  • HRC AP remote control included.
  • A sturdy metal grille is included, for total protection of the subwoofer driver.
CBA 250
High Efficiency
Low Impedance

Integrated 500 W peak/250 W RMS @ 0.4 Ω D-Class amplifier featuring he-li technology (high efficiency / low impedance) without switching power supply, for a performance next to ideal.

CBA 250
Sub Smart Plug

The SSP (Sub Smart Plug) terminal block is provided with a Plug&Play connector to be able to disconnect the box easily and safely.

CBA 250
2 Side 2 Sound

Two sides, two sound design provides the ability to select between Down-Firing positioning to increase the low-frequency extension and Up-Firing installation to obtain more punch and definition.