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Professional audio limiter EQ 2231 graphic equalizer


Product Brands: Crcbox

The Dual Channel 31 Graphic Equalizer 2231 is Revolutionary instant encode/ decode type noise Reduction in-circuit at the push of a button. Increases S/N ratio by upto 20dB. Patent-pending peakplus™ Limiter Threshold range from OdBu to +24dBu(off) can transparently tame the wildest hits or the subtlest nuances of any signal. Status LEDs offer visual feedback for all settings on the fron

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Professional audio limiter EQ 2231 graphic equalizer

Dual 31-Band electronic graphic equalizer (with compressor and Type III Noise Reduction)
2231 is designed basing on 1231 with adding compression limiter and type Ⅲ Dolby noise reduction equalizer. With type Ⅲ Dolby noise reduction function, help to further reduce the noise of the system, making the system very quiet. Compression limiter function use the currently best limiter IC (THAT2181 and THAT2522) for production, with greater than 120dB dynamic range, less than 0.0025% distortion, totally can meet with the professional level compression limiter. 2231 is a professional equalizer with equalizers, compressors, limiters, type Ⅲ Dolby noise reduction, such three kinds of equipments together, widely using in various high-end applications.


High-strength 3U aluminum panel chassis, beautiful and practical


dual filter dust-proof design, the complete elimination of dust impacts


45mm length faders produced by brand-named manufacturer, with good hand-feeling, precise adjustment


high-power switching power supply, with stable performance, wide voltage range


double-sided circuit board production, with reliable performance, low noise


Imported IC and high precision RC components, with high consistency, good sound quality


input / output connectors: 1/4 inch TRS, XLR and strip type terminals


professional-grade compression limiter function, with high dynamic range, low distortion

Professional audio limiter EQ 2231 graphic equalizer

Product Description

The Dual Channel 31 Graphic Equalizer 2231 is Revolutionary instant encode/ decode type noise Reduction in-circuit at the     push of a button. Increases S/N ratio by upto 20dB. 

 Patent-pending peakplus™ Limiter Threshold range from OdBu to +24dBu(off)  can transparently tame the wildest hits or the   subtlest nuances of any signal. 

 Status LEDs offer visual feedback for all settings on the front panel.

Professional audio limiter EQ 2231 graphic equalizer


Input Connectors  1/4" TRS, female XLR (pin 2 hot), and barrier terminal strip
Input Type  Electronically balanced/unbalanced, RF filtered
Input Impedance  Balanced 40 kOhm, unbalanced 20 kOhm
Max Input  >+21dBu balanced or unbalanced
CMRR  >40dB, typically >55dB at 1kHz
Output Connectors  1/4" TRS, male XLR (pin 2 hot), and barrier terminal strip
Output Type  Impedance-balanced/unbalanced, RF filtered
Output Impedance  Balanced 200 ohm, unbalanced 100 ohm
Max Output >+21dBu balanced/unbalanced into 2 kOhm or greater;
>+18dBm balanced/unbalanced (into 600 ohm)
Bandwidth  20Hz to 20kHz, ±0.5dB
Frequency Response  <10Hz to >50kHz, +0.5/-3dB


 (NR In: ±6dB & ±15dB ranges) 

>102dB, unweighted, ref: +4dBu, 

22kHz measurement bandwidth

Dynamic Range

 (NR In: ±6dB & ±15dB ranges) 

>120dB, unweighted


(NR Out: ± 6dB range) 

>94dB, unweighted, ref: +4dBu, 22kHz measurment bandwidth

Dynamic Range  

(NR Out: ±6dB range) 

>112dB, unweighted


(NR Out: ±15dB range) 

>90dB, unweighted, ref: +4dBu, 22kHz measurement bandwidth 

Dynamic Range 

(NR Out: ±15dB range) 

>108dB, unweighted
THD+Noise  <0.04%, 0.02% typical at +4dBu, 1kHz
Interchannel Crosstalk  <-80dB, 20Hz to 20kHz
Noise Reduction  Up to 20dB of dynamic broadband noise reduction
NR Switch  Activates dbx Type III Noise Reduction
Bypass Switch  Bypasses the graphic equalizer section in the signal path
Low cut Switch Activates the 40Hz 18dB/octave Bessel high-pass filter
Range Switch  Selects either ± 6dB or ± 15dB slider boost/cut range
I/O Meter  4-LED bar graph at -10, 0, +10, and +18dBu
Gain Reduction Meter  4-LED bar graph (all Red)at0,3,6,and 10dB

NR Active (Yellow); EQ Bypass (Red); 

Clip (Red); Low Cut (Red); ±6dB (Yellow);±15dB (Red)

Operating Voltage  100VAC 50/60Hz; 120VAC 60Hz; 230VAC 50/60Hz
Power Consumption  28W
Power Connector  IEC receptacle
Dimensions 13.34cm x 48.3cm x 20.1cm


⭐Shipping & Return⭐

Worldwide Delivery

Receiving time = Processing time + Shipping time

Processing Time:5-7 Business Days

Due to the impact of the epidemic, the logistics time may be later than the original.

We hope you will be patient and wait! We will expedite the delivery, and hope to understand, thank you!

⭐Shipping Time⭐

Express Shipping

Standard Shipping

Return or exchange within 30 days from the delivered date is accepted, Requirement:

1. Items received within 30 days from the delivered date.

2. Items received unused, undamaged, and in original package.

3. Buyers need to pay the return shipping cost, please don’t mind before bidding.

⭐Please Note⭐

1. Due to the difference of light and screen, the color of the item may be slightly different from the picture;

2. Please read and consider carefully before shopping. Thank you for your understanding.


Mini Live Wireless Collar Microphone

Insured Worldwide Shipping: Each order includes real-time tracking details and insurance coverage

in the unlikely event that a package gets lost or stolen in transit.

Money-Back Guarantee: If your items arrive damaged or become defective within 30 days of normal usage,

we will gladly issue out a replacement or refund.

✉️ 24/7 Customer Support: We have a team of live reps ready to help and answer any questions you have

within a 24-hour time frame, 7 days a week.

Safe & Secure Checkouts: We use state-of-the-art SSL Secure encryption to keep your personal and

financial information 100% protected.

Professional audio limiter EQ 2231 graphic equalizer

Enping Crcbox Audio Technology Co., Ltd.

Located in the foreign-funded private industrial zone in Enping City, Guangdong Province. We specialize in professional audio research and development, production and sales. Products include mixers/wireless microphones/power amplifiers/active or passive speakers / line array speakers/.. Since the establishment of the company, we have been aiming to develop trade and export every year. Exports have expanded, economic benefits have increased year by year, service methods have become more complete, and considerable development has been achieved. Products are exported to Europe, America, the Middle East, Southeast Asia... more than 96 countries and regions.

We have a dedicated team that is disciplined, united, skilled, and experienced. We pay attention to the people-oriented business philosophy, pay attention to employee re-education and skills, management training, and strive to create a beautiful working environment and working atmosphere for employees. We always follow "first" and lay a solid foundation for future development. With the tenet of "first-class products, first-class service, first-class reputation", it enjoys a high reputation at home and abroad, and has established good cooperative relations with domestic and foreign government departments, financial institutions and other customers.

Warmly welcome you to visit our company and work together with us to create a better future.



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