DUAL CHANNEL 31 BAND EQUALIZER WITH 2231 TYPE III™ NOISE REDUCTION DUAL CHANNEL 31 BAND EQUALIZER WITH 2231 TYPE III™ NOISE REDUCTION ® DUAL CHANNEL 31 BAND EQUALIZER WITH 2231 TYPE III™ NOISE REDUCTION With a prestigious heritage extending back to our heralded 30 Series equalizers, the dbx 2231 easily lives up to the reverred dbx reputation. Besides including two 31-band chan- nels of 1/3-octave equalization, the 2231 empowers you with flexible features like our PeakPlus™ limiter circuit, and our amazing Type III™ Noise Reduction system. It also includes +12 dB input gain range; switchable +6 or +15 dB boost/cut range; XLR, Barrier strip, and 1/4'' inputs; nonconductive nylon sliders; and an intuitive user interface with comprehensive output and gain reduction metering. As always, the inevitable result of our meticulous attention to detail and top-quality componentry is exceptional sound, performance, and reliability. The most revolutionary feature of the 2231 is our proprietary Type III™ Noise Reduction system, which enables you to boost signal-to-noise ratios by up to an incredible 20dB. The result of this instant encode/decode process is that you’re no longer forced to employ drastic EQ settings in effort to reduce system noise. Instead, you’re freed to dedicate all DUAL CHANNEL 31 BAND EQ bands to the most important thing, the music. Further, our PeakPlus™ limiter tech- nology allows you to easily safeguard your gear against hazardous dynamic surges in EQUALIZER WITH program material. In addition to these formidable tools, the 2231’s front panel provides 2231 at-a-glance insight as to gain reduction and output level status via its four-stage LED lad- TYPE III™ NOISE REDUCTION ders. With such power and finesse built into such a reasonably priced package, it’s easy to see why dbx 20 Series equalizers are relied upon by studio and touring professionals the world over. With such affordable quality, there’s no longer any excuse for compro- mising your sound. • dbx’s revolutionary Type III™ • +12 dB input gain range Noise Reduction system, which • XLR, Barrier strip, and 1/4" increases S/N ratio by up to inputs 20dB • 4-segment LED ladders for mon- • PeakPlus™ limiting technology itoring of gain reduction and with threshold range from 0dBu output levels–the most compre- to +24dBu (off) hensive visual feedback available • Two 31-band, 1/3-octave chan- • Exceptional sound quality nels with switchable boost/cut • dbx’s unmatched engineering and ranges of +6 or +15 dB construction standards 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 18-1720-C 12/99 -10 0 +10 +18 10 6 3 1 +6 +15 OUTPUT GAIN LEVEL (dBu) REDUCTION (dB) CLIP +/-15 0 +10 +15 +/-6 0 0 +5 +20 -12 +12 dB 0O dBuFF TYPE III EQ INPUT LOW PeakPlus RANGE NR BYPASS GAIN CUT THRESHOLD -6 -15 20 25 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1.25k 1.6k 2k 2.5k 3.15k 4k 5k 6.3k 8k 10k 12.5k 16k 20k 2231 Equalizer/Limiter -10 0 +10 +18 10 6 3 1 +6 +15 with TYPE III NR OUTPUT GAIN LEVEL (dBu) REDUCTION (dB) CLIP +/-15 0 +10 +15 +/-6 0 0 +5 +20 -12 +12 0OFF dB dBu TYPE III EQ INPUT LOW PeakPlus RANGE NR BYPASS GAIN CUT THRESHOLD -6 -15 2231 DUAL CHANNEL 31 BAND EQUALIZER / LIMITER WITH TYPE III™ NOISE REDUCTION -10 0 +10 +18 10 6 3 1 +6 +15 OUTPUT GAIN LEVEL (dBu) REDUCTION (dB) CLIP +/-15 0 +10 +15 +/-6 0 0 +5 +20 -12 +12 0 OFF dB dBu TYPE III EQ INPUT LOW PeakPlus RANGE NR BYPASS GAIN CUT THRESHOLD -6 -15 DUAL CHANNEL 31 BAND 20 25 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1.25k 1.6k 2k 2.5k 3.15k 4k 5k 6.3k 8k 10k 12.5k 16k 20k 2231 Equalizer/Limiter -10 0 +10 +18 10 6 3 1 +6 +15 with TYPE III NR OUTPUT GAIN LEVEL (dBu) REDUCTION (dB) CLIP +/-15 EQUALIZER WITH 0 +10 +15 +/-6 0 2231 0 +5 +20 -12 +12 0 OFF dB dBu TYPE III™ NOISE REDUCTION TYPE III EQ INPUT LOW PeakPlus RANGE NR BYPASS GAIN CUT THRESHOLD Dual Vacuum Tube Preamp -6 -15 586 OUTPUT INPUT TYPE IV™ Conversion System POWER OUTPUT OUTPUT INPUT INPUT 704 + - - + CAUTION: T O REDUCE THE RISK OF FIRE REPLACE RISK OF ELECTRIC SHOCK ONLY WITH SAME TYPE FUSE. DO NOT OPEN ATTENTION: UTILISER ATTENTION: RISQUE DE CHOC ELECTRIQUE - NE PA S OUVRIR UN FUSIBLE DE RECHANGE DE WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC MEME TYPE. SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE CONNECTOR POLARITY PHONE: XLR: TIP PIN 1 RING PIN 2 24 WATTS SLEEVE PIN 3 OUTPUT INPUT PROFESSIONAL PRODUCTS A HARMAN INTERNATIONAL COMPANY MODEL 2231 MANUFACTURED UNDER ONE OR MORE OF THE FOLLOWING OUTPUT INPUT EQUALIZER/LIMITER WITH OUTPUT INPUT U.S. PATENTS: 4,234,804 4,316,107 4,329,598 4,331,931 4,377,792 TYPE III NOISE REDUCTION + - - + 4,403,199 4,409,500 4,425,551 4,434,380 4,454,433 4,471,324 100V 50/60Hz 4,473,793 OTHER PATENTS PENDING 120V 60Hz Inputs The graphic equalizer shall be a dual 31-band type with frequency centers on standard ISO Connectors: 1/4” TRS, female XLR (pin 2 hot), and barrier ter- Function Switches one-third octave frequencies ranging from 20Hz to 20kHz. The boost/cut ranges shall be minal strip Type III NR: Activates dbx Type III‘ Noise Reduction switchable via recessed front panel switches to either +/-6dB or +/-15dB and the selected Type: Electronically balanced/unbalanced, RF filtered EQ Bypass: Bypasses the graphic equalizer section in the sig- range shall be indicated on the front panel by either of two LEDs per channel. Low-noise Impedance: Balanced 40kS, unbalanced 20kS nal path Max Input Level: >+21dBu balanced or unbalanced Low Cut (recessed): Activates the 40Hz 18dB/octave Bessel high-pass equalization sliders having a 45mm travel shall be utilized having center detents at 0 dB. The CMRR: >40dB, typically >55dB at 1kHz filter equalizer shall have front panel 41-detent rotary input gain controls having a +/-12dB range. Outputs Range (recessed): Selects either +/- 6dB or +/- 15dB slider boost/cut Bypassing the equalizer sections of the signal path shall be accomplished via front-panel Connectors: 1/4” TRS, male XLR (pin 2 hot), and barrier termi- range switches having corresponding LEDs to indicate when each channel is bypassed. A 40Hz nal strip Indicators low-cut Bessel filter per channel with 18dB/octave slope shall be insertable in the signal path Type: Impedance-balanced/unbalanced, RF filtered Output Level Meter: 4-LED bar graph (Green, Green, Yellow, Red) at - Impedance: Balanced 200S, unbalanced 100S 10, 0, +10, and +18dBu via front panel recessed switches with LEDs to indicate when the filters are active. Max Output Level: >+21dBu balanced/unbalanced into 2kS or Gain Reduction Meter: 4-LED bar graph (all Red) at 0, 3, 6, and 10dB greater Type III NR Active: Yellow LED The graphic equalizer shall incorporate dbx Type III™ Noise Reduction providing up to 20dB >+20dBm balanced/unbalanced (into 600Ω) EQ Bypass: Red LED of broadband noise reduction, having front panel switches to enable the noise reduction and System Performance Clip: Red LED Bandwidth: 20Hz to 20kHz, +/-0.5dB Low Cut Active: Red LED LEDs to indicate when it is active. The equalizer shall also be equipped with dbx PeakPlus™ Frequency Response: <10Hz to >50kHz, +0.5/-3dB +/-6dB range: Red LED limiters having front panel 41-detent rotary limiter threshold controls varying from 0 to Noise Reduction In (+/-6 and +/-12dB range): +/-12dB range: Red LED +24dBu (off) and four-LED gain reduction bar graphs calibrated to read 0, 3, 6, and 10dB. Signal-to-Noise: >102dB, unweighted, ref: +4dBu, 22kHz measure- Power Supply Output levels shall be monitored on four-LED peak-reading bar graphs calibrated to read -10, ment bandwidth Operating Voltage: 100VAC 50/60Hz, 120VAC 60Hz 0, +10, and +18dBu. Dynamic Range: >120dB, unweighted 230VAC 50/60Hz Noise Reduction Out: (+/-6dB range): Power Consumption: 23W Signal-to-Noise: >94dB, unweighted, ref: +4dBu, 22kHz measur- Mains Connection: IEC receptacle Electronically balanced/unbalanced inputs shall include 1/4" TRS, female XLR, and screw ment bandwidth Physical terminal barrier strip, while servo-balanced/unbalanced outputs shall include 1/4" TRS, male Dynamic Range: >112dB, unweighted Dimensions: 5.25" H X 19" W X 7.9" D (13.335cm x 48.3cm x XLR, and screw terminal barrier strip shared with the input. A circuit/chassis ground lift Noise Reduction Out: (+/-12dB range): 20.1cm) Signal-to-Noise: >90dB, unweighted, ref: +4dBu, 22kHz measure- Weight: 10.6 lbs. (4.8081 kg) jumper per channel shall be strapped across circuit ground and chassis ground screw termi- ment bandwidth Shipping Weight: 11.6 lbs. (5.267 kg) nals and shall be removable by the user. Inputs shall be electronically balanced/unbalanced Dynamic Range: >108dB, unweighted and RF filtered having a nominal input impedance not less than 40kS balanced and 20kS THD+Noise: <0.04%, 0.02% typical at +4dBu, 1kHz unbalanced, and shall accept maximum signal levels of not less than +21dBu. Outputs shall Interchannel Crosstalk: <-80dB, 20Hz to 20kHz (2215/2231) be servo-balanced/unbalanced and RF filtered having a nominal output impedance of not Noise Reduction: Up to 20dB of dynamic broadband noise reduction Note: Specifications subject to change. more than 200S balanced and 100S unbalanced, and shall be capable of driving not less than +21dBu into 2kS or greater and not less than +20dBm (into 600S) continuously. Frequency response shall be better than 10Hz to 50kHz, +0.5/-3dB. Signal-to-noise ratio shall be greater than 90dB, referenced to +4dBu, in either boost/cut range with noise reduction disabled and shall be greater than 102dB with noise reduction enabled. THD+Noise shall be less than 0.04% with a 1kHz signal at +4dBu, while interchannel crosstalk shall be lower than -80dB from 20Hz to 20kHz. The internal power supply shall be constructed using a thermally-fused transformer mounted in a low hum orientation and shall be magnetically isolated from equal- izer circuitry by means of a mu-metal shield. The power cord shall be detachable from an international standard IEC 320 power inlet receptacle. Unit shall be constructed to meet or exceed all applicable international safety and regulatory agencies. Domestic unit shall be powered from 100VAC 50/60Hz, 120VAC 60Hz, FOR MORE INFORMATION CONTACT: while international unit shall be powered from 230VAC 50/60Hz. Unit shall consume no more than 24W. Housing shall be of all steel/aluminum construction and shall be rack-mountable in an IEC standard 19" rack and shall occupy a 3U (5.25") rack space. The unit shall be a dbx 2231 Ultra Quiet Equalizer/Limiter. dbx Professional Products 8760 S. Sandy Pkwy. dbx engineers are constantly working to improve the quality of our products. Specifications are, therefore subject to change without notice. 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