ETI Sound Systems, INC Choosing AN Amplifier, Connectors, LX-18 Connection Diagrams

CHOOSING AN AMPLIFIER:

) It is important to choose an amplifier that matches the power rating of the LX-18 (see specifications on back page).

) When using TWO (2) LX-18 subwoofers in you system you may choose an amplifier that delivers up to 750 watts @ 8 ohm stereo or an amplifier that delivers up to 1500 watts @ 4 ohm bridge (when connecting two LX-18 in parallel). Other combina- tions are possible– –consult your authorized dealer or call B-52 for additional details. See Connection Diagram (right) for details. ) Use caution when using large amplifiers. All amplifiers are capa- ble of putting out much more power than they rated for. The amplifiers rating is specified as undistorted output (low THD––total harmonic distortion). Amplifiers are capable of pro- ducing much greater power that they are rated for when driven into clipping.

) Under powering the LX-18 may also damage the subwoofer. Using a small amplifier and clipping its high output signal could damage the subwoofer. Clipping the amplifier may distort the signal and cause over heating of the voice coil.

USING AN ELECTRONIC CROSSOVER

For optimal performance, it is extremely important that an elec- tronic crossover be used in the audio system. An electronic crossover will provide a low-pass output allowing the LX-18 to only play low frequencies. B-52 recommends setting your low-pass crossover filter between 80 to 120 Hz, depending upon the venue and sound desired. In case of doubt, set the low-pass crossover to 100 Hz.

It is highly recommended to use an electronic crossover with

24 dB per octave slopes or higher. If your amplifier or electronic crossover provides a 30 Hz subsonic filter, make sure this filter is turned ON. The subsonic filter will prevent the subwoofer from reproducing frequencies below 30 Hz. At high SPL, frequencies lower than 30 Hz can damage to the subwoofer.

CONNECTORS:

		The LX-18 includes (2) 1/4” phone jacks
1	2	and one Neutrik NL4 Speakon input ter-
		minals. All three terminals are internally

connected in parallel. Each of the three connections can be used as an input or as an output.

1.Neutrik NL4 Terminal

2.1/4” Phone Jacks

1/4” Phone Jack Wiring

NEUTRIK CONNECTOR

Pin 1	+	............Subwoofer + (input or output)
Pin 1	-	............Subwoofer - (input or output)
Pin 2	+	............Subwoofer + (input or output)
Pin 2	-	............Subwoofer - (input or output)

portant: When connecting a speaker to an amplifier or when connecting two speakers together, it important to match the polarity (+/-). Connect positive-to-positive and negative-to negative.

LX-18 CONNECTION DIAGRAMS

STEREO CONNECTION

MIXER

L R

ELECTRONIC CROSSOVER

LOW PASS OUTPUTS

L R

L AMPLIFIER R

STEREO OUTPUT

LX-18LX-18

BRIDGED CONNECTION

MIXER

L R

ELECTRONIC CROSSOVER

LOW PASS OUTPUTS

L or R Out

AMPLIFIER

BRIDGED OUTPUT

(Amp must be stable at 4 ohms in the BRIDGE mode)

LX-18LX-18

Connecting two LX-18 subwoofers in

parallel results in a 4 ohm load.

There are numerous other configurations available. Please consult your Authorized B-52 Dealer or contact B-52’s Customer Service.

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