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NDCV Singularity 2 Tantalum Class D modules

NewClassD NCDV Singularity 2 Discrete 700W in 4 Ohms Class D Module Tantalum

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Ultra low 0.0005% typ distortion High End Class D Audio Amplifier modules. This is our best amplifier ever. It's power capability of up to 700W RMS is not the main feature. This is microdetails in open space, showing you the true emotion embedded in the music clearer than ever before. The sound quality and specs are now on par with some of the best and costliest amplifiers in the world. Still the build cost is only around 3000$.

With the NCDV Singularity we aimed to make a true high end Class D amplifier module, with no compromise, even on cost. And now two years later Singularity 2 is out improved on 7 points, which are all related to sound quality. We made more listening tests, more redesign runs and more component testing than ever before. So this is clearly the best amplifier we have ever made.
It is not optimized by THD or other specifications, but instead the listening results prevailed, every time, even in cases where a design choice reduced the specification, but sounded better. So you can say the motto here is: Improve the specs, as long as it doesn't destroy the good sound.

So if you go for the best, there is no easy way around the Singularity 2 Tantalum module. The frequency bands hang together seamlessly,
the bass is deep, clear and controlled, the mids are warm, roomy and no detail escapes unheard. The top is airy and crystal clear, but with no hint of sharpness. We listened to about 30 different types of capacitors to find the one with the perfect balance of air, clarity, and resulution. No S sound is standing out, but you should be able to hear every wave of sound from the recording. Brass should sound perfectly like brass. To make this ambition stick seamlessly together with the voice region and 3D space of the ochestra was quite a challenge. We have heard every possible outcome of this in our development process, but at the end, we found the perfect solutions.

Every module is assembled in Denmark, and then hand tested in every aspect for hours. The dead time is maticulously adjusted to less than 1nS, and DC etc. are adjusted to zero. Then the module is left to burn in for a few hours at 50 degrees C, mimicing the typical operation condition. This takes some time, and thus the module is not particularly cheap. However it will compare with 4-10 times costlier factory amplifiers. The dynamic range is a mind boggling 140 dB from the noise floor to clipping level. This means even when you press your ear against the tweeter you will hear absolutely nothing. But still the most powerful sounds will reproduce clearly and with impressive dynamics at up to 700 Watts RMS in 4 Ohms.

Equipped with no compromise.
There are six audio resistors on each module, the output filter resistor, the feedback resistor, and four gain setting resistors. This version is equipped with Audio Note (R) Tantalum Resistors

The measured technical precision may be less than Holco and Welwyn, but the musicality is crazy. The depth perspective is holographic, and the bass has details, never heard before with other types of audio resistors. These are by far the best sounding resistors we have tested.

Is it worth it?
If you have never heard these resistors, you will probably live happily with other types, with a more humane cost. However if you have once heard them, it's hard to get by with less.

Singularity 2 vs. Singularity 1.
Compared to Singularity 1, the new Mk2 has seven smaller or larger improvements. One of the more noticeable, aside from the choice of audio resistors, is the use of pure silver finish on the circuit board. Before we would use ENIG or 'Electroless Nickel Immersion Gold' finish, or in other words a thin layer of Gold on top of a thicker layer of Nickel. We found however that the nickel layer could be affecting the sound quality adversely, as the signal passes through this layer on each component pin. So with all the components adding up, the signal must pass through the nickel layer maybe hundreds of times.
By listening tests of the exact same circuit board we found that a pure silver finish has a cleaner sound, with less toning.

Another improvement is the use of polypropylene capacitors in the output filter, rather than mylar types we used before.
The output capacitor is divided in three capacitors, rather than two used in the previous version. So this gives a lower ESR, better high frequency performance, and thus less noise on the output.
Other improvements include UWB regulators for the analog input stage, rather than simple zener regulators. Also the opamp's for the input buffer are now type Ultimate Edition with 100 V/uS slew rate, and absolutely fantastic sound quality. You can get these as discrete OPAMP modules as well, to upgrade any IC OPAMP in your signal chain.

Before the gate driver power supply was found on the power supply module, and shared between the 2 or more channels driven by that power supply. But with Singularity 2, the gate driver power regulator is moved onto the module, so now you have a separate supply for each channel, giving more of the dual mono effect. Are we at seven yet?

The THD + N is typically 0.0005% at 1kHz 1W 8 Ohms load (Blue Line). This is the most interesting level of measurement,
because the power level where you spend you time really listening after details in the music is from 0.3W to 1W rms.
Your amplifier will still sound clean at 100W. With some classic types of amplifiers you would typically expect the
distortion to be lower the bigger the amplifier. This is because you are using a smaller portion of it's linear working
span when you listen at 1W. But in Class D amplifiers there is no linear working area. So it will sound as clean at 1W
as it does at 10 or 100W. You don't need to overkill the power capability like you would have with a Class A/B. The pink
line is the unused channel, so please discard that. But even so at 40W rms the THD is still low at 0.01%.

Here you can see the artefacts spectrum with 1W sinewave at 1W rms. There is one peak at 2kHz (second harmonic) at
-110dB ( = 0.0003% ) and that's it. The rest of the distortion drowns out in the -128dB noise floor. And second
harmonic distortion, that's the friendly type, that makes your music sound relaxed, though less detailled, and this
type of distortion is found in large amounts in triode amplifiers. So this is world class performance right there.

The noise floor of the Singularity 2 is ultra low thanks to the relatively low gain, and the ultra lownoise transistors
used in the analog inputs. -130dB or less noise, giving a S/N ratio of 120 dB up to 1W.

Intermodulation is a harmful distortion type in some amplifiers. But not Singularity 2. With 9 and 10 kHz signals at 1W,
there should be regular artefacts at 1 kHz steps, but there are only a few artefacts at less than -100dB ( 0.001% ).

NewClassD | Lars Clausen Technologies IVS | DK7500 Holstebro | Denmark | tel +45 31627823 | E-Mail: |36844