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In integrating our custom Apollon input buffer with the unbuffered NCx500, we've not only incorporated four input sensitivity gain settings and selectable XLR/RCA inputs, but we've also enhanced the measurable performance of the NCx500.The state of the art class D AUDIOPHONICS HPA-S600NC and AUDIOPHONICS HPA-S400ET sound different, though there is a caveat here.
(some people claim, without evidence, to hear a difference, others don't Fixed it for you.audiosciencereview.com
@Apollon Audio It's nice to have some insight about the differences in sound using these op amps. How do they compare to the onboard Hypex buffer @amirm was using in his review? Is it not recommended or any other reason why it cannot be chosen as an option?
Even at higher gain settings there is a slight improvement.
Furthermore, my testing with diverse operational amplifiers reveals variances in the performance metrics of the NCx500. Specifically, I've utilized three distinct op-amps: Sonic Imagery 994, OPA1656 and LM4562. The data clearly indicates that the NCx500 exhibits optimal performance when paired with the Sonic Imagery 994 or OPA1656, whereas its integration with the LM4562 resulted in a bit worse measurements.
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Hypex NCx500 Mono amplifier OEM Class D Measurements.png101.1 KB · Views: 73
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THD+N Ratio vs Measured Level NCx500 DM (op amp test).jpg190.7 KB · Views: 711
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Screenshot 2023-08-29 at 22.49.28.png562.8 KB · Views: 696
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THD+N Ratio vs Measured Level NCx500 DM (op amp test).png428.6 KB · Views: 49
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