Taking It To The Max – The Aletheia psu-2

If you have read the history of the Aletheia PSUs, and how the Aletheia-psu-1 was developed, you should be able to see how we then might naturally want to extend the performance of this topology to its maximum capability. This is where the psu-2 comes in.

In the psu-1 & 2 the topology, layout, general construction and casework are identical. And this forms the backbone of both the psu-1’s and psu-2’s performance. But there are a few things that it’s worth spending some extra time and money on (as in any of the Vertex AQ or Aletheia products) and this is silver conductors, better EMI absorption materials and more complex acoustic absorption labyrinths.

Each of these three additions adds additional capability to the psu-2 as follows:

1. The use of silver conductors enables us to better deal with RFI. The great benefit of our solid-core silver conductors (with a polished surface and Teflon insulation) is that they conduct radio frequency signals better. And because of this we lower the wiring impedance between the inputs and outputs and all the filter points within the unit. It might seem counterintuitive, that it would be better to have wire with higher impedance, but if you do this you never really get rid of your RFI problem – you just leave it sitting at the other end of the wire, doing its damage.
2. The use of our best EMI absorption materials, particularly our EMI absorptive tubing over the conductors, significantly reduces the higher RFI frequencies. These treatments are totally passive – and reactive, they absorb the electro-magnetic field produced by high-frequency RFI, and that drains the energy away, to gently attenuate the electrical RFI signal that would otherwise remain in the conductor.

3. Using more complex 3-D acoustic labyrinths in the modules. The time-consuming process of building more complex labyrinths results in far better breakdown of acoustic energy, particularly at higher frequencies. The more complex labyrinth has many more path lengths in different directions, increasing the randomness of the destructive interference of the labyrinth.

Aletheia psu-2 Performance

As you would imagine, the performance of psu-2 goes beyond that of psu-1. The power quality is even better and those systematic interactions of RFI, EMI and microphony are reduced even further. All the great performance benefits that psu-1 brings are there, but more so with psu-2.

And as with the psu-1, we really need to consider the psu-2 in a high-end system context. One where multiple front-end components are going to benefit from the individual protection from vibration and RFI, as well as the huge benefit of the noise cancelling properties of the balanced output. What this brings is further reduction in both the noise floor and the system’s tracking error, bringing to the proceedings a level of smooth yet crystalline transparency that is simply breathtaking. The system also gains real musical insight – the ability of each box in the chain to work without the influence of the other boxes polluting proceedings is immediately obvious in the way the music propels along with so much more natural life and dynamics. It’s like the system was choking itself before the psu-2 was introduced.

If you are wondering what the press think of the psu-2, you might like to check out this review: Aletheia psu-2 review by Alan Sircom, HiFi Plus issue 95


Aletheia psu-2 Balanced Mains ConditionerThe Aletheia psu-2