Description

Mola Mola Ossetra 

Small form factor, powerful output.  A lovely ‘little’ amplifier.

In the years gone by since the original release of the Mola Mola Kaluga power amplifier, we have been working on further improvement of our class D technology. With the Mola Mola Ossetra we have made another significant step in our Proprietary, Mola Mola Trajectum, amplifier technology.

The design of the Mola Mola Ossetra amplifier started from a blank sheet, redesigning every aspect of the amplifier and extending its capabilities beyond the highest expectations.

On the power supply side, next to a significant noise reduction we improved 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.

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.

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.

Key features

PERFORMANCE

350W/8 ohm, 700W/4 ohm, 900W/2 ohm
Gain: 22dB or 28dB
Unweighted Signal/Noise Ratio: 130 dB Distortion
(THD, IMD): <0.0002 %
(all frequencies and power levels)v Input Impedance: 300kohm
Output Impedance: <0.0015 ohm (DF>5000), all frequencies
Bandwidth: >100kHz

I/O

Balanced and unbalanced input, selectable by switch
2 pairs of Furutech binding posts.
Biwired directly to the amplifier PCB using
Kubala·Sosna cable.
Trigger input (3.5mm jack)

DIMENSIONS AND WEIGHT

200mm (W) x 110mm (H) x 335mm (D) Depth includes
speaker terminals. 7kg Depth includes speaker terminals. 7kg