® Let’s take a look at the construction features of the dbx 234XL. At first glance you’ll notice the units are great look- ing, and as you turn the controls something else becomes apparent; these units are extremely well built. The controls exude great precision, and the feel is a solid “click”. Also, when you open the box, you won’t find the external power supply that accompanies most processors in this price range. That’s because we know how difficult external power supplies can be to work with and even though it costs a little more we put the high quality power supply right in the unit. All the inputs and outputs are balanced XLR connectors that are screwed directly to the chassis. This con- necting of the jacks insures that even if someone steps on a cable plugged into the unit, it’s not going to tear up the circuit board inside. All dbx crossovers feature Linkwitz-Riley 24 dB per octave filters, the professional standard, but then again, what did you expect? Via two switches on the back panel you first select whether you’re operating your system in stereo 2-way, 3-way or mono 4-way. Another back panel switch also selects whether or not you want to mono sum the LF (subwoofer) out. (Most systems that use a subwoofer are mono summed to take advantage of amplifier power and because low fre- quencies are non-directional.) Back panel switches allow you to select the range of the crossover frequencies indi- vidually for both channels. The crossover frequency controls have a green LED that indicates the X10 switch on the back panel is activated (we wouldn’t make you check the switch position on the back every time you wonder where it’s set). All these switches are on the back panel because it could be disastrous if you were to change them mid-pro- gram. On the front panel you’ll notice there are LEDs that indicate whether the unit is in mono or stereo mode. Each channel has an input gain control for proper level setting. There’s a recessed 40 Hz low cut (HPF) on each channel to remove unwanted low frequencies. Both the low and high outputs on each channel have a gain control ranging from -∞ to +6dB, to allow muting of individual outputs and for level matching. Also, these outputs each have phase reverse switches that’ll help get you out of a bind without having to reconfigure your system. These phase reverse switches may be internally reconfigured as mute switches. You’ll get great performance, all the features you’d expect from a professional product, and the knowledge that you’re buying a processor from the people that have been producing the world’s finest processors for over 20 years. The technology that made us famous brings you a dbx crossover which has been tested to the highest professional standards at a price that’s just too low to admit! • XLR differentially balanced ins and outs • 24dB per octave Linkwitz-Riley filters (the • Mode switches for mono 4-way or stereo professional standard) 2-way/3-way operation • Stereo/Mono status LEDs indicate the • Low frequency summed (subwoofer) output selected mode • x10 range switch on both channels • dbx 2 year parts and labor as standard • 40 Hz high pass (low cut) filter both • CSA NRTL/C approved channels • CE compliant 8760 S. Sandy Pkwy. Sandy, Utah 84070 • Phase reverse switch on all outputs Phone (801) 568-7660 • Individual level controls on all band outputs Fax (801) 568-7662 Int’l Fax (801) 568-7583 customer@dbxpro.com http://www.dbxpro.com A Harman International Company 18-1773-A 01-99 CHANNEL ONE CHANNEL TWO -10 -10 -10 -10 -10 -10 0 240 2.4k 0 240 2.4k 140 350 1.4k 3.5k 140 350 1.4k 3.5k -6 +6 -6 +6 -30 -30 70 680 700 0 -30 0 -30 0 70 680 700 0 -30 0 -30 0 6.8k 6.8k 40 Hz INV INV INV 40 Hz INV INV INV x10 x10 -12 +12 45 960 450 9.6k - +6 - +6 - +6 -12 +12 45 960 450 9.6k - +6 - +6 - +6 dB Hz Hz dB dB dB dB Hz Hz dB dB dB GAIN XOVER FREQ XOVER FREQ GAIN GAIN GAIN GAIN XOVER FREQ XOVER FREQ GAIN GAIN GAIN INPUT LOW CUT LOW/LOW-MID LOW-MID/HIGH-MID LOW OUTPUT LOW-MID OUTPUT HIGH-MID/HIGH HIGH-MID OUTPUT HIGH OUTPUT MONO INPUT LOW CUT LOW/MID MID/HIGH LOW OUTPUT MID OUTPUT HIGH OUTPUT STEREO INPUT LOW CUT LOW/MID MID/HIGH LOW OUTPUT MID OUTPUT HIGH OUTPUT 234XL STEREO 2-WAY / 3-WAY / MONO 4-WAY CROSSOVER CHANNEL ONE CHANNEL TWO -10 -10 -10 -10 -10 -10 0 240 2.4k 0 240 2.4k 140 350 1.4k 3.5k 140 350 1.4k 3.5k -6 +6 -6 +6 -30 -30 70 680 700 0 -30 0 -30 0 70 680 700 0 -30 0 -30 0 6.8k 6.8k 40 Hz INV INV INV 40 Hz INV INV INV x10 x10 -12 +12 45 960 450 9.6k - +6 - +6 - +6 -12 +12 45 960 450 9.6k - +6 - +6 - +6 dB Hz Hz dB dB dB dB Hz Hz dB dB dB GAIN XOVER FREQ XOVER FREQ GAIN GAIN GAIN GAIN XOVER FREQ XOVER FREQ GAIN GAIN GAIN INPUT LOW CUT LOW/LOW-MID LOW-MID/HIGH-MID LOW OUTPUT LOW-MID OUTPUT MONO HIGH-MID/HIGH HIGH-MID OUTPUT HIGH OUTPUT INPUT LOW CUT LOW/MID MID/HIGH LOW OUTPUT MID OUTPUT HIGH OUTPUT STEREO INPUT LOW CUT LOW/MID MID/HIGH LOW OUTPUT MID OUTPUT HIGH OUTPUT The crossover shall be selectable for stereo 2-way, INPUT: Connectors: XLR FUNCTION SWITCHES: 3-way or mono 4-way operation, each stereo chan- Type: Electronically balanced/unbalanced, RF fil- Front Panel: tered Low Cut: Activates 40 Hz Butterworth, 12 dB/octave nel having input gain and low, mid, and high out- Impedance: Balanced > 50 kΩ, unbalanced > 25 kΩ high-pass filter, one switch per channel. put gain controls, a switchable low-cut filter, two Max Input Level: > +21 dBu balanced or unbalanced Phase Invert: Inverts the phase at the output, one switch CMRR: > 40 dB, typically > 55 dB at 1 kHz per output. variable crossover frequency controls, and low, Rear Panel: x1 / x10: Multiplies the low-mid (mono: low/low-mid) mid, and high output phase invert switches on the OUTPUT: crossover frequency range of the front- Connectors: XLR front panel. Rear-panel input connectors shall be panel markings by a factor of 1 or 10, one Type: Impedance-balanced/unbalanced, RF fil- switch per channel. tered XLR balanced/unbalanced with input impedance Mode: Selects stereo 2-way, 3-way or mono 4- Impedance: Balanced 200 Ω, unbalanced 100 Ω way operation and disables all LEDs for Max Output Level: > +21 dBu balanced/unbalanced into 2 kΩ of not less than 50 kΩ balanced and 25 kΩ unbal- controls that are non-functional in the or greater anced and maximum input level of not less than mono mode. LF Sum: Selects normal (stereo) or mono-summed PERFORMANCE: +21 dBu. Rear-panel low, mid, and high output low frequency operation and disables Ch Bandwidth: 20 Hz to 20 kHz, +0/-0.5 dB 2’s low output phase invert LED to indi- connectors shall be XLR impedance- Frequency Response: < 3 Hz to > 90 kHz, +0/-3 dB cate that this output is not operational in Signal-to-Noise: Ref: +4 dBu, 22 kHz measurement band- balanced/unbalanced with output impedance of no the LF sum mode. width Stereo Mode: Mono Mode: more than 200 Ω balanced and 100 Ω unbalanced INDICATORS: Low Output: > 94 dB > 94 dB Stereo Operation: Green LED and maximum output level of not less than +21 Low-Mid Output: > 94 dB Mono Operation: Yellow LED Mid Output: > 93 dB dBu into 2 kΩ or greater. Input gain controls shall Low Cut: Red LED per channel High-Mid Output: > 92 dB x10: Green LED per channel High Output: > 92 dB > 92 dB be variable from -12 to +12dB and output gain Phase Invert: Red LED per output (3 per channel) Dynamic Range: > 114 dB, unweighted, any output THD+Noise: < 0.004% at +4 dBu, 1 kHz controls shall be variable from -∞ to +6dB. Each POWER SUPPLY: < 0.04% at +20 dBu, 1 kHz Operating Voltage: 100-120 VAC 50/60 Hz; 120 VAC 60 Hz output’s phase invert switch shall have an LED to Interchannel Crosstalk: < -80 dB, 20 Hz to 20 kHz 230 VAC 50 Hz indicate inverted phase and shall be internally Power Consumption: 15 Watts CROSSOVER FREQUENCIES: Mains Connection: IEC 320 receptacle Stereo Mode: selectable to change the invert function to a mute Low/Mid: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 function. Low-cut filters shall be 12dB/octave PHYSICAL: setting) Dimensions: 1.75" H X 19" W X 6.9" D (4.4cm x Mid/High: 450 Hz to 9.6 kHz Butterworth type at 40 Hz and shall be activated by 48.3cm x 17.5cm) Mono Mode: Weight: 4.0 lbs. (1.8 kg) Low/Low-Mid: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 recessed switches with LEDs indicating active sta- Shipping Weight: 5.8 lbs. (2.6 kg) setting) tus. Low/mid frequency controls shall be variable Low-Mid/High-Mid: 450 Hz to 9.6 kHz High-Mid/High: 450 Hz o 9.6 kHz from 45 to 960 Hz and shall be scaleable to 450 Hz Note: Specifications subject to change. Filter Type: Linkwitz-Riley, 24 dB/octave, state-vari- able to 9.6 kHz via rear-panel “x10” frequency range switches with front-panel LEDs indicating “x10” status, and mid/high frequency controls shall be variable from 450 Hz to 9.6 kHz. A rear-panel LF sum switch shall sum the pre-output gain signals of both channels’ low-frequency outputs and route the combined signal to channel 1’s low output and shall disable channel 2’s low phase invert LED. A rear-panel mode switch shall select between stereo 2-way, 3-way, and mono 4-way operation with front-panel LEDs indicating the selected mode. Mono operation shall convert channel 1’s low/mid and mid/high and channel 2’s mid/high crossover frequency controls to low/low-mid, low- mid/high-mid, and high-mid/high controls respectively, and shall convert channel 1’s low and mid outputs and channel 2’s mid and high outputs to low, low-mid, high-mid, and high outputs respectively, while channel 1’s input, input gain, and low-cut filter shall remain active. All other functions shall be inactive and the mono mode shall disable LEDs for all inactive functions. Frequency response shall be 3 Hz to 90 kHz or greater and signal-to-noise ratio shall be not less than 92 dB on any output in any mode. THD+Noise shall be less than 0.004% at +4 dBu and less than 0.04% at +20 dBu from 20 Hz to 20 kHz and interchannel crosstalk shall be no greater than -80 dB from 20 Hz to 20 kHz. The unit shall operate from a power source of 100 VAC 50/60 Hz to 120 VAC 60 Hz for a domestic unit and 230 VAC 50 Hz for a european unit via IEC type AC cable and shall consume no more than 15 W. The size of the 1U high, full rack width unit shall be 1.75" H X 19" W X 6.9" D (4.4cm x 48.3cm x 17.5cm) with a net weight of 4.0 lbs. (1.8 kg) and a shipping weight of 5.8 lbs. (2.6 kg). The crossover shall be a dbx 234XL. dbx engineers are constantly working to improve the quality of our products. Specifications are, therefore subject to change without notice. FOR MORE INFORMATION CONTACT: dbx Professional Products • 8760 S. Sandy Pkwy. • Sandy, Utah 84070 ® Phone (801) 568-7660 • Fax (801) 568-7662 • Int’l Fax (801) 568-7583 customer@dbxpro.com • http://www.dbxpro.com A Harman International Company