Mola Mola is pleased to announce the release of their new Mola Mola Ossetra power amplifier!

The Mola Mola Ossetra is a 350W/8 Ohm full-bridge amplifier, mono, half size chassis.
With the Mola Mola Ossetra, we have made another significant step in our Proprietary Mola Mola Trajectum,
class D amplifier technology.
The design of the Mola Mola Ossetra amplifier started from a blank sheet, extending its capabilities beyond
the highest expectations.

In the power supply, we realised a significant noise reduction while improving both dynamic and continues
output power. Combined with the vastly increased current capabilities of the amplifier output stage, it makes
this amplifier able to drive practically any load.

The Mola Mola Ossetra is a full-bridge power amplifier design, the full-bridge output makes the amplifier
design fully balanced from input to output.

For the Mola Mola Ossetra we designed all new discrete class A gain stages. Using these new gain stages
enabled us to revise the gain structure of the entire amplifier. This results in exemplary noise and distortion
performance of the complete system.

The amplifier bandwidth of over 100kHz, keeps the frequency response absolutely flat within the audio band.
The minimal load dependency establishes absolute consistency, irrespective of loudspeaker load.
The input stage distortion is below our current measurement threshold at approximately -150dB
(~0,000003%), ensuring an immaculate power stage performance.

World premiere
October 10 will see the world premiere while shipping will start early December.

Additional background
In order to push the boundaries of our Trajectum technology, the design of the Ossetra amplifier started from
a blank sheet, redesigning every aspect of the amplifier and coming up with new and even better solutions.

Power supply
Meeting EMI regulations is, of course, mandatory for electronics equipment. For products with high-end
aspirations meeting these regulations is far from sufficient. We set the limits far tighter! With the new power
electronics supply, this received even more attention, which enabled us to make another step. Next to a significant noise reduction, we were able to improve on both dynamic and continuous output power. Combined with the vastly increased current capabilities of the amplifier output stage, it makes this amplifier able to drive practically any load.
Directly related to the main power supply behaviour is the choice to go for a full-bridge power amplifier
design. A full-bridge amplifier is a friendlier and easier load on the power supply, relieving it from some
secondary tasks, and making the design less complex. The full-bridge output now essentially makes the
amplifier design fully balanced from input to output.

Modulator and feedback system
For the Ossetra we designed all new discrete class “A” gain stages, which create most of the gain needed
in this high feedback amplifier design. These gain stages are designed to have high open loop bandwidth,
individually tailored to their specific tasks in the loop filter. With these new gain stages we have been able to
change the gain structure of the entire amplifier without any ill effects. Thus allowing us to optimise noise
and distortion performance of the complete system. The resulting amount of feedback around the power
stage is where the real difference is.

Input stage
For the input stage we have also designed new discrete class “A” amplification. The gain stages share some
basics with the gain stages further up the signal path, but an input stage has additional requirements. The
main tasks for this input stage are to create a high impedance input for the source or preamp, add gain and
ensure no DC, or, other signal-unrelated noise, enters the power stage.
Our input stages are DC coupled, meaning no capacitors in the signal path which can degrade the sound. In
the new input stage we have chosen a similar technique as used in our Makua preamplifier. Here minor DC
offsets are corrected and at higher levels a capacitor is placed in the signal path. This is to ensure compatibility with third party products which might not handle this properly further upstream. New shunt voltage regulators are also used in this input stage. These shunt regulators take noise rejection and output impedance to
a new level without the need of cascading multiple regulators. Shunt regulators draw constant current from
the power supply, this current can go directly to the load when it is needed, or, dissipated in the shunt when
the load does not need it. With the shunt located close to the load, this keeps all AC currents local. The wide
bandwidth design ensures behaviour of the regulator is constant throughout the entire audio band, making
sure it adds as little of its own characteristics as possible.