With both my Topping 元0 (sent back to Amazon due to the ESD/blown headphone matter) and the JDS Lab Atom that replaced the 元0 needed to be set to the high gain level for maximum flexibility in listening levels. Of course, the downside of this is that, depending on the EQ applied, a significantly reduced signal level will be sent to a headphone amp. The practical result is that any boost EQ applied in MathAudio Headphone EQ should never clip the output form Foobar. The filtered output maximum peak is -6 dB below the pink noise output when no filters were applied. In the second graph, the Headphone EQ slider was set to -6 dB. It can be used as an audio mixer for your desktop device if it has Windows installed. Peace Equalizer is an APO that adds more to your GUI, such as an effects panel for balance, delay, cross-feeding, and a graph window. The Headphone EQ gains slider was set to 0 dB in this test. A free equalizer APO for your Windows device. The remainder of the filtered response is below the output from Foobar with no EQ applied. The maximum boost peak touches the no EQ applied pink noise output. In one graph, the output of the pink noise signal with no EQ applied in the MathAudio plug in is compared to the output with the HD280 Pro filter active. In this EQ, there is a total range of about 11 dB between the maximum boost and cuts in the filter. There is a screenshot shown of an EQ I developed for my Sennheiser HD280 Pro headphones. Output from my laptop went to the ASIO driver for a Topping D10 DAC, and the analog output was input into a Focusrite Scarlett 2i2 with measurements taken with ARTA. These were generated by playing a pink noise signal in Foobar 2000 with the MathAudio Headphone EQ plug in enabled in the DSP manager of the Playback Preference. It is implemented as an Audio Processing Object (APO) for the system effect infrastructure introduced with Windows Vista. Equalizer APO is a parametric / graphic equalizer for Windows. Since then I have made some measurements with the results shown in the attached files. A system-wide equalizer for Windows 7 / 8 / 8.1 / 10 / 11. I also said that I had not made any measurements to confirm this hypothesis. In my earlier post on this thread ( #5), I mentioned that it appears that MathAudio Headphone EQ for Foobar reduces the overall output by setting the maximum boost applied in the EQ to a level of 0 dB. This is a follow up to my earlier post on this thread.
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