SGR Press Centre

SGR Audio announces limited edition current-drive upgrade for its CX3B Mk1 and CX3C Mk1 active loudspeakers

23 July 2018

After an extremely successful CX4F upgrade program, SGR Audio is now offering an exclusive opportunity for CX3B Mk1 and CX3C Mk 1 owners to advance to the evolutionary second generation technology.

“This is an exclusive release, with a limited production capacity of only 25 pairs of CX3B speakers and 10 CX3Cs,” SGR Audio CEO Mr Stuart Ralston says. “You’ll need to act quickly if you don’t want to miss out on the chance to own our game-changing Mk2 technology.”

The most exciting aspect of the upgrade program is the installment of SGR Audio’s renowned current-drive amplifier, which allows music to be delivered to the loudspeaker driver in its purest form with maximum ease.

“Most, if not all, commercial amplifiers control the voltage at the output terminals but the actual sound produced from a loudspeaker is directly proportional to the current flowing through the voice coil, not the voltage across it,” Mr Ralston says. “Our Mk2 amplifiers control the current flowing at the output, not the voltage.”

“The sonic difference is clear and quite amazing,” Mr Ralston says. “The level of smoothness and lack of grain is astonishing, bringing a whole new level of clarity to the listener’s experience.”

The second generation amplifier is not only technologically innovative, it is also aesthetically impressive, with the entire back plate having been expertly and precisely machined in-house from a single piece of aluminium, and impeccably finished with our stunning Micro Pearl anodising process.

“Apart from its sleek look, the amplifier enables the practical improvement of greater heat dissipation, allowing higher class A amplifier bias,” Mr Ralston says. “If this wasn’t already enough of a reason to opt for the upgrade, there’s an enticing list of additional enhancements to seal the deal.”

A new, custom-made and in-house assembled tweeter is also part of the package, providing a smoother on-axis response, higher frequency extension up to 30 kHz and greater power handling, lower distortion and improved transient response. Further intensifying this impressive offer are the additional inclusions of advanced enclosure damping to further reduce panel resonances and a power supply upgrade which enables increased capacitance.

“It’s a complete package of advancements where every part, no matter how small or seemingly insignificant, has been progressively refined and upgraded to produce the purest possible sound,” Mr Ralston says.

“With our state-of-the-art manufacturing facility in Melbourne, we have the unique ability to have these original versions transformed into the Mk2 through in-house modifications performed by our experienced team,” Mr Ralston says.

Originally released in 2016, SGR Audio’s current-drive amplifier was the culmination of several years of research and development, involving futuristic, forward-thinking vision and side-stepping conventional thinking. Applying aspects of Esa Merilainen’s current-driving theory to SGR Audio’s amplifier technology, along with Mr Ralston’s expertise in physics and electronics, the perfect solution was discovered and resulted in the substantial improvements on offer in the Mk2 range.

Owners of the first generation speakers can take part in this exclusive upgrade program for $3,800 AUD per pair of CX3B Mk1s and $2,000 AUD per CX3C Mk1.

For more information about the CX3B Mk2 and CX3C Mk2 visit the Convex Series product page.

Download product images here: DropBox link

To register your interest in the upgrade program, please contact SGR Audio by emailing