So should be just a bit higher than 0.001% with Amir's test condition.
Ah right. 8ohm vs 4ohm is 6db. 5W vs 10W is 3dB. Then noise can contribute 1db or so, can be higher due to spikes or rising high frequency noise but not present here.
With limited negative feedback and decreasing when frequency rises, this can happen.Thanks, had me wondering! I would not expect significant rise in noise (compared to any other amplifier class) until much higher in frequency and much closer to the switching frequency.
They are already bridged design that is how they are fully balanced from input to output. So you cannot bridge them.Will it be possible to bridge the amps? Since I implemented Dirac Live my Purifi amp is struggling.
Very impressive. I would like to ask some question.
1. Can your amplifier drive the 2-Ohm load safely? If yes, how much power it can produce within distortion of 0.1% at 2-Ohm load?
2. Even if the efficiency of your class-D is very high, I would like to ask if there is an easy way to mount your amplifier module to a large heatsink to keep the amplifier cool when driving a high load long time.
3. What is the CMRR of your amplifier module at 100 Hz, 1000 Hz & 10000 Hz?
Yes. This will probably be 6 months out. I have to work on one product at a time.Will there also be a Starkrimson-Ultra with PecanPi DAC built-in ..?
1. Can your amplifier drive the 2-Ohm load safely? If yes, how much power it can produce within distortion of 0.1% at 2-Ohm load?
2. Even if the efficiency of your class-D is very high, I would like to ask if there is an easy way to mount your amplifier module to a large heatsink to keep the amplifier cool when driving high load long time.
3. What is the CMRR of your amplifier module at 100 Hz, 1000 Hz & 10000 Hz?
It will not work with any supplies in that series other than the A100, this is because the voltage would be too high and damage the amp.@orchardaudio I'm considering ordering a pair, but would any of Hypex' other power supplies work? The A100 appears to be discontinued here in Europe for some reason, and it would be much more affordable for me to purchase what I can here in EU. A180 and up are available, but those are higher voltage. Though if the board operates best with that specific supply, I'll just have to figure something out - I want the best performance at the end of the day.
Very impressive. I would like to ask some question.
1. Can your amplifier drive the 2-Ohm load safely? If yes, how much power it can produce within distortion of 0.1% at 2-Ohm load?
2. Even if the efficiency of your class-D is very high, I would like to ask if there is an easy way to mount your amplifier module to a large heatsink to keep the amplifier cool when driving high load long time.
3. What is the CMRR of your amplifier module at 100 Hz, 1000 Hz & 10000 Hz?
1. Yes it can drive 2-ohms safely, full test results will have to wait (see my previous post)
2. The GaN devices are bottom cooled, which means they dissipate heat into the circuit board, putting a heatsink on top will help but this will provide minimal improvement. I will do a set of efficiency tests for you, once I have the final boards.
3.
CMRR at 100Hz: 87dB
CMRR at 1kHz: 87dB
CMMR at 10kHz: 87dB
I have started to test the new modules and the results are looking very promising. Ill be posting more later.
For now here is wideband FFT with -40dB otuput. 0dB = 44.72V (250W into 8 ohm)
You can see the switching frequency of 770kHz. The noise floor in the audio band is very low.
Switching frequency of Hypex power supply is around 90kHz, can also be seen in the graph.
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