Lol I adjusted the crossover, so no double blind A/B
And why would you double-blind a difference in gain anyway?
Removed the Rg resistors today.
Definitely not a subtle difference.
Highly recommended to anyone wanting to void his warranty and risk his boards
Could you please post what resistors are Rg resistors on NC100HF an which on NC252MP ?
What are benefits of removing them ? Only lower gain or ?
Thanks
See here https://www.diyaudio.com/forums/class-d/306815-hypex-fusion-plate-amps-174.html#post5964380
Its a tight space so you need to be careful. I used 2 soldering irons, with a solid wire strapped around as a fine tip. Resistors popped right out with minimal heat.
Separation and size of instruments increased in an obvious way.
Its a tight space so you need to be careful. I used 2 soldering irons, with a solid wire strapped around as a fine tip. Resistors popped right out with minimal heat.
Separation and size of instruments increased in an obvious way.
Thanks
But could you please tell me the number of post to look ?
When I click link it opens me last page of the tread...
Edit : 1733
I have to loog out to se that
Last edited:
Your subjective unverified perception is noted.
Besides lowering gain, removing the resistor increases feedback, so as Bruno noted, distortion numbers might drop a tiny bit, but they are already way below any audibility.
I have done the mod on my 8 nCores purely for gain structure reasons. The sound quality didn't change in any way.
The main reason I removed them was to reduce the idle noise which was annoying in my system, and to improve SNR and number of active bits at low volumes. The main downside is that max power is reduced. Which in my case is a benefit as max power of my units is much less than the Fusion 253. Though I would only consider this mod for relatively high efficiency speakers and low to normal listening volumes.
Fedde
So in your case the improvement comes from adapting the gain structure to better match your system - there is no improvement to the Fusion as such, just to how it matches your system requirements.
Probably yes. I think the improvement in distortion must be quite minor. I do not have equipment at home to measure this. Though reducing idle noise could be seen as an improvement in the Fusion itself...
Fedde
It may not improve the max SNR of Fusion, but will improve the SNR of the Fusion itself at specific (lower) output volumes...
Fedde
In the meantime I have found two red herrings...
1. I had a configuration issue in my kernel streaming/WASAPI libraries. This caused permutations of the audio by kmixer...
2. Last weekend I installed a JL sound v3 USB to SPDIF PCB in my system. This gives an incredible amount of additional resolution and directness/room information compared to my RME AIO soundcard, probably due to more precise clock but maybe also because my RME AIO is not bit perfect.
If I can find some spare time, I plan to do some SPDIF loopback tests to prove what exactly was/is going on...
Fedde
Not sure if it is worth continuing this debate, but...
Yes, on system level SNR is better. But also on Fusion side it is for low output power levels. Basically what happens is that the DAC outputs have a certain base noise level and signal level depending on number of bits active. By lowering amp gain, the noise of the DAC are less amplified but to achieve the same Fusion output level, the DAC signal can become stronger by using more active bits (up to max level of DAC naturally). So the SNR on output of Fusion will also be better, until max DAC level is used where SNR is roughly same as in unmodified condition.
Fedde
This is exactly my point. SNR is the ratio of the maximum output signal to the noise floor.
Hi,
About the tweeter amp/NC100HF in the Fusion amps. Has somebody tried running it with a full-range driver to down to say 500 hz?
Hypex Electronics B.V.
According to the link is has fullrange frequency response, but not sure about if the module starts to distort to much running it low.
About the tweeter amp/NC100HF in the Fusion amps. Has somebody tried running it with a full-range driver to down to say 500 hz?
Hypex Electronics B.V.
According to the link is has fullrange frequency response, but not sure about if the module starts to distort to much running it low.