From Lizard Wizadr site:

"Our UNIDIRECTIONAL CURRENT ACCELERATOR works like the LIZARDWIZARD PMC-AMPLIFIER as it varies its gain depending on the speaker's instantaneous impedance and phase characteristics, but this is passive device that connects between the amplifier and the speaker. There is no power supply unit needed.

UNIDIRECTIONAL CURRENT ACCELERATOR means that the direction of the current does not change it's course between the source (amplifier) and the loudspeaker.

The loudspeaker moves as it reacts to the demands of the amplifier (it acts lie a dynamo). Due to the laws of physics the current will also flow back towards the amplifier which causes distortion. So the load is omnidirectional for the current. In all other devices (e.g. microphone, CD players, etc.) the current is unidirectional. In contrast, with the UNIDIRECTIONAL CURRENT ACCELERATOR the speaker is connected directly to the source's output. This means that it transforms the input voltage signal sent from the amplifier to the speaker into unidirectional current, so that it drives the speaker with perfect control, and allows for no Back Electro-Mechanical Force (back-EMF) distortion.

There is not only electromagnetic connection between the amp and the speaker, there is also close electronic (current) tie, so you don't need to use expensive cables. The UNIDIRECTIONAL CURRENT ACCELERATOR is a Mono-Block so it will also work perfectly with home cinema set-up."

Here is also PMC theory, that will help understand UCA's more:

"The PMC-Amplifier (Para-Magnetic Current Amplifier) will handle high quality loudspeakers, without air disturbance/acoustic aliasing distortion that can be found in common transistor amplifiers.

This PMC-Amplifier is an amplitude - velocity converter device, which is the most important for handling the reactive loads of the loudspeakers.

PMC Amplifier is the solution for handling complex waveforms (music) into acoustic vibrations!

The usual heat-providing elements of amplifiers are not included in this one. Therefore, during it's operation it does not heat itself at all! The LizardWizard PMC-amplifier does not require a warm-up. As soon as it is turned on, it provides the same 100% sound quality, that it would provide after a few hours of continuous use.
When developing LizardWizard, it was not just the principle of simplicity that guided the developer to choose the coil-amplifier but also the additional advantage of using the dynamic speaker, which is also a coil. In order, to make the above so mystically mentioned principle understandable, we first have to take a look at the operation principle of common transistor amplifiers. Today's everyday solid state amplifiers are usually classified as voltage-generator amplifiers. Based on their operation principle they provide the multiplicity of the input voltage at the output. If possible, this occurs independently of the strain of the output. The strain of the output, or rather of the end-transistors and the power-supply can be loaded variably, it won't change the output current at all. Therefore the output is stable. All conventional "solid state" amplifiers are false in acoustic physics, they are mainly made for voltage linearity and ultralow output resistance which can mainly drive only resistor loads. If we look at old tube amplifiers, the situation is different. The tube works as a generator, once it is under high voltage. In order for it to operate a speaker, an output transformer is necessary. Here the level of strain does matter, as the resistance of the load needs to be precisely specified.

The Primary coil has very high impedance needed by the Valve amplifier, this explains the mid & high frequency gaining distortion, early cutoff frequency response, specially in high-watt big transformers. Even in this case the only thing that we are talking about is just a simple impedancy.

One of the bad qualities of the dynamic speaker is that the coil that moves in a magnetic field can be viewed as many things, except as a passive unit with constant parameters. However, this is what most people like to think of dynamic speakers in general. If we also count that the speaker is an impedancy that can be strained in a complex way, then we have to accept that the strain in relation to the original sound (the output of our CD player) can not be reproduce perfectly by the speaker. This distortion can be caused by several factors, like the fact that the magnetic fields are not homogeneous, or mechanical impotency, or several other nuances. Naturally, the creators of the speakers try to minimize these distortions with many built-in devices. Based on what is mentioned above, it is easily deductible that during the development of the LizardWizard the aim was not the linearization of the current-frequency, that is measurable at the end-points of the amplifier, but optimisation of the entire system, which is the transfer of the changing-impedance strained amplifier! (note: as opposed to the concept of the LizardWizard, the usual solutions are busy with the optimisation of the independent units, rather than the entire system.)

Previously we have just talked about the complexity of the speaker. However, until now we have considered the load as a passive bi-polar, that is under current, therefore it makes a sound. What's important here is that it DOES make a sound! Electronically the bipolarity is the speaker itself, but physically it is quadropolar, although the second pair of poles are not electronic, but sonic. What we're talking about here is an electronic transformation.

That means that the electronic parameters of the speaker are changing according to the factors of the environment, physical happenings of the sonic side.
(With an adequate solution the sonic features can be transformed into units of electronic circuits, therefore the 
speakers are often modelled with and are stimulated by complex electronic switches.)
This means that our speaker's electronic impedance contains all the sonic parameters of the blaster, the box itself, and even that of the surrounding environment too!

Because of the coil within the amplifier and because of the close electronic tie between the coils, this system can provide a faster and more precise operation than any other system supplied with the usual amplifiers.

PMC means the existence of the serial parallel law (unknown yet). Serial parallel law means:

Example: when you connect 2 loads (2 pieces of 8ohm loudspeakers) in serial or you connect it in parallel mode, you must get the same output volume, BUT acoustically, not electrically! When this happens all impedance "changes" will receive the same acoustic (not electric) output power level.

In loudspeakers: when serial parallel law exist (ideal 1:1) you won't get air disturbance (a bit like SWR in antenna physics). This does not exist when the electric impedance is in mismatch mode (drive/load).
Example: Conventional amplifiers are mismatch 4 to 1 (4:1), because they have Voltage follower output so you receive 4 times bigger power output in parallel mode. In practice we found the most effective setting to be (1:1.2) slope where 1.2 (about +2dB) bigger output is in serial mode.

(parallel to serial-factor)

Our PMC amplifier will vary its gain and phase characteristic, this depends on the load nature (meanwhile in time), not like the standard fixed gain voltage following output type found in conventional amplifiers."

How does UCA speaks music?

UCA is simple passive device, that it doesn't require much hassle to set up. Nevertheless you should be careful connecting it to the the power amplifier. Do turn it off when you're inserting UCA between your speakers to avoid any risks of damaging. 

UCA is unidirectional by nature and you can connect it from any side, but two sets of speakers cables are still needed. They're housed in a massive aluminium block enclosure, that hides out what's exactly incorporated into this musical device. From what I can figure out, these must be some sort of transformers, that we are know from step up traffos and passive preamplifiers.

Does the magic works?

It does. Peter asked me to expose it to the wide variety of amplifiers and I took my task seriously. It took me few months to test UCA with dozen different amplifiers and even in pro studio situations with non active studio speakers. 

I can clearly say, that UCA can act in the right conditions like additional few missing watts of great "imaginary "power amplifier. No matter if I used it with tube or solid state amps effect was always evident and the same. UCA's gave a clear, yet sublime improvement in focus, positioning of instruments and more dimensional feeling of performers. It also felt like somehow dynamics were packed with more attack and lifelike transients. 

I cannot forget about the bass. I'm not bass freak. Sadly too many audiophiles and music lovers simply don't perceive the bass as it is. Most of the time bass is much more recessed as we might think. It surely depend on the event or the way recording was made, but the true art of high fidelity and high-end lies in reproduction of correct natural bass. UCA simply extended the quality of amplifier in charge without any artefacts. That should be compliment in itself.

Hearing some of the Toscanini unforgettably captured recordings revived those historical moments with all the glory. It was the same with my favourite Michael Franks. Sleeping Gypsy never seems to lost any of the groove and inner perplexed understanding of musicians. Everything was still as smooth as I recall it from my numerous previous listening's.


Everyone with integrated or power amplifier with up to 200 watts can benefit with Lizard Wizard UCA's unidirectional current accelerators. I would strongly recommend that you use two identical speaker cables when you're inserting UCA's into current system. They are sensitive about system synergy and you might to invest some more time and founds into finding right speakers cables. In two systems that I tested UCA's, we had to change two or three sets of cables for what it seems it to be impedance or system mismatch. When we finally found the right combination Hi-hats and vocals instantly changed for better. Harshness and aggressivness were finally in absence.

Lizard WIzard unidirectional current accelerators are functional additions to any system. For reasonable investment you'll get few of the "watts", that you might missed in your amplifier.

Very subtle and capable audiophile accessory, that needs a careful matching and trained ear for the best performance. 

Technical specification:

Output impedance: 4-8 ohm per device.
Output power should not exceed 200Watts per channel
Dimensions: 85mm x 60mm x 20mm (width x heigth x depth)
Available colour combinations: magenta, cyan, neon-yellow.

Matej Isak
Mono & Stereo high-end audio magazine
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