DCX2496 Modifications - Digital Crossover / Loudspeaker Management

The Standard DCX2496

The Good:

The DCX is a highly flexible digital crossover for loudspeaker builders or live sound systems. It can accept stereo analog or digital inputs and split the signal for tweeter, mid and woofer (or other configurations), sending the signals to 6 analog outputs. Parametric EQ and adjustable time delays are also possible, allowing correction of the speakers and room. The adjustable crossover slopes allow more flexibility than typical analog crossovers.

Input connections: 1 pair XLR analog, 1 AES/EBU digital, 1 Microphone XLR. Outputs: 6 XLR analog XLR (3 stereo pair).

 

A Problem:

The features of DCX mentioned above are superb, however there is an achilles heel; the analog inputs and outputs have relatively high distortion compared to the best alternatives.

 

The solution - Modification

In fact, the DAC and ADC chips inside the DCX are high-end items from AKM and Cirrus Logic. Much of the music you listen to will have been recorded using these same converters, as they have been used inside audio interfaces from industry leader ProTools.

The distortion of the DCX is created by the analog signal conditioning circuits, not the converters themselves. Unfortunatly, simply replacing the op-amp chips in the exisiting circuit does not correct the distortion issues. The solution is to replace the analog circuits in their entirety with new circuit designs.

Upgrade circuits availible from BehringerMods are offered as a self-install kit or with installation provided by BehringerMods for those less confident at soldering.

These new upgrade circuits allow the signal converters in the DCX to reach their full potential with low distortion and noise of all kinds.

Upgrade Circuit - The BehringerMods upgrade PCB conviniently handles both analog input and output conditioning on a single board for Inputs A,B and Outputs 1-6. The DCX kit also includes a 'link PCB' which reduces the soldering nesicary to install the upgrade.

The input section is implimented using a fully differential op-amp from Texas Instruments (LME49724), purpose made for driving audio ADC chips. The circuit can be fed from either a single-ended or balanced input. A dedicated voltage reference is used to provide bias for the ADC, allowing for the lowest possible noise level.

The output section is designed to emulate the behaviour of a transformer coupled circuit, enabling it to provide active noise cancellation whether connnected single-ended or balanced. The design is built around Texas Instruments 'SoundPlus' OPA1652 op-amps allowing the full performance of the DAC chip to be heard. This single PCB upgrades

The circuit comes with through-hole mounted DC blocking and power smoothing capacitors from arguably the most respected brand Panasonic.

The Behringer DCX when modified with this new circuit is capable of less than 0.0005% THD and IMD from analog input to output. 

The input and output signal level for 0dBFS digital is 3.5V RMS.

Input C is not upgraded.

Learn more about the distortion types of the DEQ and DCX here: Proof of Upgrade Performance

Short FAQ here.

Pricing can be found in the the Online Shop

 

 

 

DCX-Upgrade PCB

 

 

DCX Link PCB

 

 



DCX Install Guide
BehringerMods DCX Install Guide

 

Proof of Upgrade Performance