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KP-480 Spec Sheet?


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John, while not the same they are 480s and I would think pretty close.


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18" Bass Reflex Woofer With 15" Passive RadiatorKP480.gif

The Klipsch Professional KP-480-BX is a high-output, bass reflex speaker system that combines an 18-inch (46 cm) woofer with a down-firing 15-inch (38 cm) passive radiator. This unique design produces extended low frequency response and higher output from a smaller and lighter enclosure than can be achieved with more conventional vented designs.

Passive Radiator/LF Section

The KP-480-BX is so compact because its passive radiator allows the enclosure to be tuned much lower, eliminating the need for long vents that require more room inside the cabinet. At 15 inches, the passive radiator has a much larger radiating area than a typical vent, so at low frequencies, it couples better to the air.

The passive radiator even reduces the possibility of woofer over-excursion by limiting the woofer when the system is driven too hard below the tuning frequency. Its specially designed rubberized plastic surround allows up to 1 1/5 inches (3 cm) of peak-to-peak excursion. It can move a lot of air without the noise associated with some vented designs.

The KevlarŽ composite passive radiator coupled with the K-49 woofer and its large 96-ounce (2.7 kg) magnet allows the KP-480-BX to produce well-damped and powerful low-frequency output with much less amplifier power.

Stackable and Packable

The KP-480-BX features a top-mounted stand socket, which can serve as a base for locating the main speakers in the air. By using 1 1/2-inch (3.8 cm) tubing to connect the two systems, the use of a tripod is not necessary. The KP-480-BX compact dimensions make for an easy "truck pack." In fact, 16 units take up less than 2 1/4 feet of truck space.

Passive Crossover

The passive crossover is a factory-installed option on the KP-480-BX. The KP-480-BX passive crossover is set at 150 Hz with a slope of 12 dB per octave for the woofer and 6 dB per octave for any full-range speaker system connected to the HF output section. Entirely self-contained on the back of a standard KP series input panel, the passive crossover is easily installed by removing the old input panel, unplugging the leads to the woofer, connecting the leads from the passive crossover panel to the woofer and using the old screws to attach the new panel to the back of the box.

To use the crossover, plug the full range input into either of the bottom connectors (1/4-inch phone plug or five-way binding posts). Use a jumper cable to connect either of the top two connectors (HF out) to the input of any full-range system (4 or 8 ohms) or a paralleled pair of 8 ohm speakers. The KP-480-BX passive crossover will even operate with woofers alone, without any load on the HF output section.

The KP-480-BX passive crossover allows you to add a subwoofer to just about any system without the complications and expense of bi-amping. The design of the crossover allows maximum coupling of the subwoofer and full range enclosure. The slower roll-off of the HF output ensures you get the most from the woofer in the full-range enclosure before it crosses over to the subwoofer. It also prevents signals below the box tuning frequency from reaching the full-range system, increasing power handling and reducing distortion in the mid-bass region.

Architect's and Engineer's Specifications

The loudspeaker system shall be a subwoofer consisting of an 18-inch (46 cm) K-49-K woofer and a KD-17 passive radiator. The woofer shall have a cast aluminum frame and the voice coil shall be three inches (7.6 cm) in diameter with a KaptonŽ form. The passive radiator shall be 15 inches (38 cm) in diameter and have a Kevlar composite cone with a rubberized surround.

System sensitivity shall be 104 dB SPL, with 2.83 V input, measured at a distance of one meter in a half space anechoic environment. Maximum continuous output shall be 129 dB SPL at a distance of one meter with maximum continuous power input of 400 watts (40.5 V). Frequency response shall be 44 Hz to 200 Hzą4 dB, -10 dB at 34 Hz. Nominal impedance shall be 8 ohms.

The cabinet sides shall be constructed of 3/4 inch, furniture grade, void-free plywood with textured water resistant black paint. The baffle board shall be one-inch, void-free plywood. All edges will be internally braced.

Dimensions shall not exceed 26 29/32 inches (68.3 cm) high, 23 7/8 inches (60.6 cm) wide and 24 1/16 inches (61.1 cm) deep. Net weight shall not exceed 85 pounds (38.6 kg).

The loudspeaker shall be a Klipsch KP-480-BX, manufactured by Klipsch, L.L.C.



Frequency Response (3 Meters, 1/2 Space Anechoic): 44 to 200 Hz, ą 4 dB Usable Response to 2,500 (-10 dB @ 34 Hz)

Power Handling: 400 Watts* (40.5 V)

Maximum Continuous Output @ 1 Meter with 400 Watt Input: 129 dB

Sensitivity @ 1 Watt/1 Meter (2.83 V): 104 dB SPL

Nominal Impedance: 8 Ohms (4.2 Minimum @ 43 Hz)

Maximum Long-Term Calculated Acoustic Output Power: 11.5 Acoustic Watts

Woofer 1/2 Space Reference Efficiency: 2.77%

Enclosure Tuning: 41 Hz

Crossover Frequency: 150 Hz via (Optional) Internal Passive Crossover, 12 dB/Octave Roll-off for Woofer, 6 dB/Octave Roll-off for HF Output.

Enclosure: One-inch (2.54 cm) Baffle Board. All Sides 3/4-inch (19 mm) Plywood, Internally Braced, Lined with Acoustical Foam. Black Metal Grille. Woofer Attached with Woofer Clamps.

Input Connections:  1/4-inch Phone Jacks and Red/Black Five-way Binding Posts. Input is Fused (4-A Recommended).

Height: 26 29/32" (68.3 cm)

Width: 23 7/8" (60.6 cm)

Depth: 24 1/16" (61.1 cm)

Weight: 85 lbs. (38.6 kg) Net, 99 lbs. (45 kg) Shipping


*AES standard, continuous pink noise 40-400 Hz, with 6 dB peaks above the continuous level.



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