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Author Topic: dbx 234 (199?) Stereo 2/3 Way, Mono 4-Way Crossover  (Read 159 times)

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Online chrisNova777

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dbx 234 (199?) Stereo 2/3 Way, Mono 4-Way Crossover
« on: January 18, 2019, 12:56:53 PM »
dbx 234 -- Stereo 2/3 Way, Mono 4-Way Crossover
http://web.archive.org/web/19970110232935/http://www.dbxpro.com:80/p1stuff/07p1234.htm


Quote
dbx 234 -- Stereo 2/3 Way, Mono 4-Way Crossover
Precision Engineered and Constructed
Let's take a look at the construction features of the dbx Project 1 234. At first glance you'll notice the units are great looking, 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 powersupplies 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 TRS differentially balanced 1/4" jacks that are bolted down to the chassis. This "nutting down" 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. A switch on the back panel makes selecting different operating voltages a snap for when you take your system overseas. The dbx Project 1 crossovers feature Linkwitz-Riley 24 dB per octave filters, the professional standard, but then again, what did you expect?
Designed for Professional Results
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 subbed to take advantage of amplifier power and because low frequencies are non-directional.) Back panel switches allow you to select the range of the crossover frequencies individually 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-program. 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 +6 dB, 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.
The Logical Solution
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!
SPECIFICATIONS:
INPUT:
Connectors: 1/4" TRS
Type: Electronically balanced/unbalanced, RF filtered
Impedance: Balanced > 50 kohms, unbalanced > 25 kohms
Max Input Level: > +24 dBu balanced or unbalanced
CMRR: > 40 dB, typically > 55 dB at 1 kHz
OUTPUT:
Connectors: 1/4" TRS
Type: Impedance-balanced/unbalanced, RF filtered
Impedance: Balanced 200 ohms , unbalanced 100 ohms
Max Output Level: > +21 dBu balanced/unbalanced into 2 k or greater
PERFORMANCE:
Bandwidth: 20 Hz to 20 kHz, +0/-0.5 dB
Frequency Response: < 3 Hz to > 90 kHz, +0/-3 dB
Signal-to-Noise: Ref: +4 dBu, 22 kHz measurement bandwidth
Stereo Mode: Mono Mode:
Low Output: > 94 dB > 94 dB
Low-Mid Output: > 94 dB
Mid Output: > 93 dB
High-Mid Output: > 92 dB
High Output: > 92 dB > 92 dB
Dynamic Range: > 114 dB, unweighted, any output
THD+Noise: < 0.004% at +4 dBu, 1 kHz < 0.04% at +20 dBu, 1 kHz
Interchannel Crosstalk: < -80 dB, 20 Hz to 20 kHz
CROSSOVER FREQUENCIES:
Stereo Mode:
Low/Mid: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
Mid/High: 450 Hz to 9.6 kHz
Mono Mode:
Low/Low-Mid: 45 to 960 Hz or 450 Hz to 9.6 kHz (x10 setting)
Low-Mid/High-Mid: 450 Hz to 9.6 kHz
High-Mid/High: 450 Hz o 9.6 kHz
Filter Type: Linkwitz-Riley, 24 dB/octave, state-variable
FUNCTION SWITCHES:
Front Panel:
Low Cut: Activates 40 Hz Butterworth, 12 dB/octave high-pass filter, one switch per channel.
Phase Invert: Inverts the phase at the output, one switch per output.
Rear Panel:
x1 / x10: Multiplies the low-mid (mono: low/low-mid) crossover frequency range of the front-panel markings by a factor of 1 or 10, one switch per channel.
Mode: Selects stereo 2-way, 3-way or mono 4-way operation and disables all LEDs for controls that are non-functional in the mono mode.
LF Sum: Selects normal (stereo) or mono-summed low frequency operation and disables Ch 2's low output phase invert LED to indicate that this output is not operational in the LF sum mode.
INDICATORS:
Stereo Operation: Green LED
Mono Operation: Yellow LED
Low Cut: Red LED per channel
x10: Green LED per channel
Phase Invert: Red LED per output (3 per channel)
POWER SUPPLY:
Operating Voltage: Switchable: 100-120 VAC 50/60 Hz or 200-240 VAC 50/60 Hz
Power Consumption: 15 Watts
Mains Connection: IEC 320 receptacle
PHYSICAL:
Dimensions: 1.75" H X 19" W X 6.9" D (4.4cm x 48.3cm x 17.5cm)
Weight: 4.0 lbs. (1.8 kg)
Shipping Weight: 5.8 lbs. (2.6 kg)


Note: Specifications subject to change.
« Last Edit: January 18, 2019, 01:05:01 PM by chrisNova777 »