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NCDX200 Buffer Free Class D amplifier module

NewClassD NCDX 200 W in 8 Ohms Buffer Free Class D Module for surround or active filter setups

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200 Watt Class D Amplifier module with outstanding sound quality. This version has been tweaked from our NCDX platform to have very high detail, and dynamic performance, but low idling power consumption, at the cost of maximum power. It's limited by use of smaller MOSFET's to 200 Watts compared to 480 Watts for the standard NCDX module. If you want to use all 200 Watts you must optimize the transformer voltage to match your speaker load's nominal impedance. For example for 8 Ohms speakers you can get 200 Watts by using a 2 x 42 V AC transformer. But that particular setup cannot safely drive 4 Ohm speakers, as the transformer would make the amplifier output 400 Watts, which is above it's specification. So if you want 4 Ohms capability, you should consider a slightly lower transformer voltage, then 4 Ohms will also be supported. The amplifier will not break in case of slight overload of the specification, but the power have to be taken into consideration. For 200 Watts in 4 Ohms, and 100 Watts in 8 Ohm power, you should use a transformer of 2 x 33 V AC. This module is not optimized for use with low ohmic loads below 3.2 Ohms.

To optimize the cost and power consumption, some functionality is taken out of the module, compared to the standard NCDX module. Including the input buffer. This means it has a lower gain, only 22 times, compared to 50 for the standard NCDX version. Also it is always inverting, which can be counteracted simply by reversing the speaker wires. (You still use the + input). There is also no support for balanced input signal. If this is required we recommend our bigger module the NCDX standard version. It is optimal for use in surround sound multichannel setups or active speaker setups with multiple amplifier channels, where heat emission might become an issue. The NCDX200 has low idle consumption, and thus very limited heat generation. A bottom plate of 2-3mm aluminium is sufficient to cool 6 or 7 channels of 200 Watts each.
Also the direct coupled buffer free operation will remove some circuit from the signal path, which is probably redundant in this type of setup. So that improves the sound quality a little bit.
You can in a stretch still use this module for normal 2 channel high end audio, with a passive potentiometer on the input, (10k log), and get a great result. Just make sure the potentiometer is placed close to the input terminals, and of course in the same enclosure, otherwise you might lose dynamics and details. It is still fully capable of driving and controlling big 2 or 3 way loudspeakers, and getting the best out of them.

NewClassD | Lars Clausen Technologies IVS | DK7500 Holstebro | Denmark | tel +45 31627823 | E-Mail: |5898