Spectral Flatness and Earbud Insert Test
- Audio-measuring-system, spectrum analyzer, oscilloscope, wavegenerator, shareware, software with soundcard Example: 1kHz tone of a measurement record Spectrumanalyse with Fast-Fourier-Transformation (up to 1024k points).
- Scroll down to your active sound device. Right-click your device and click properties. Click on the Advanced tab. Click on the dropdown menu and select 2 channel, 16 bit, 44100 Hz. Click OK to confirm your changes. Test your audio again and see if the audio crackling issue has been fixed.
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Dolby Audio delivers rich, clear, powerful sound in the cinema, at home, and on the go. Dolby Audio™ is built into a wide range of products worldwide, so you can experience the best audio quality from all the content you enjoy, whether it's a broadcast, a stream or download, or a disc. An evolution in audio. I'm running on a MSI Z87-G45, i5 4670K, 16GB DDR3@1600Mhz. Audio (Realtek HD Audio) and Network (on-board Killer e2200) drivers are all up to date and have been cleaned and reinstalled multiple times. Even tried a full/clean windows install for good measure without any improvement.
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Ideally, you want your headphones to reproduce all frequencies consistently between the lower and upper limits, without a dip or peak in a particular frequency range. Absolute flatness is not exactly what you are looking for, though. Your hearing may not be perfect, and if you think about it, the best headphones are those that compensate for your particular hearing curve. It doesn't matter if your headphones are not flat, as long as they sound flat through your ears.
Frequency responses are measured using sine sweeps and special test equipment. With a prominent sensitivity bump around 1–3 kHz, humans are not good at judging flatness: frequencies in the upper medium range will always sound louder than what they are because of the increased hearing sensitivity. Our test tone is not a regular sweep. It embeds an inverted hearing sensitivity curve that turns it perceptually flat. Our compensation only works at hearing threshold levels: turn your computer level down so that the test tone plays as quietly as possible.
If the sweep keeps playing at your hearing thresholds, your headphones are matched to your ears. If your hearing is perfect, this also means that the headphones have a flat frequency response. If your hearing is imperfect, this then means that your headphones are simply matched to your ears. If the test tone sometimes disappears, or gets too loud, you know you have a problem, either with your hearing or your headphones.
This test is of particular importance for earbuds. Depending on how deep you insert them into your ear canal, their frequency response will change drastically. Use this test to find which insertion depth gives you the flattest frequency response.
Room Acoustics Software
REW is free software for room acoustic measurement, loudspeaker measurement and audio device measurement. The audio measurement and analysis features of REW help you optimise the acoustics of your listening room, studio or home theater and find the best locations for your speakers, subwoofers and listening position. It includes tools for generating audio test signals; measuring SPL and impedance; measuring frequency and impulse responses; measuring distortion; generating phase, group delay and spectral decay plots, waterfalls, spectrograms and energy-time curves; generating real time analyser (RTA) plots; calculating reverberation times; calculating Thiele-Small parameters; determining the frequencies and decay times of modal resonances; displaying equaliser responses and automatically adjusting the settings of parametric equalisers to counter the effects of room modes and adjust responses to match a target curve.