![]() ![]() After a long day of setting up the compressor and equalizer, I accidentally left the equalizer enabled when I was running the tests to determine where compression starts at different frequencies. Why does the compressor start to compress at different levels for different frequencies? If I would have reduced the gain of the 250 Hz frequency by about 9 DB and the 500 Hz frequency by about 3 DB to follow their ideal curve, I suspect the high annoying pitch of voices would have disappeared. ![]() This created a very bad proportional relationship between the fundamental voice sound and the first and second level harmonics which were disproportionately too high creating extremely high pitched voices. In my case, I didn’t follow their curve but instead only reduced the gain at the 125 Hz frequency. ![]() I suspect they developed the ideal hearing curve from testing different people and determined that people with that curve had the best hearing determined by different tests. Why did voices have such a high annoying pitch when I reduced the 125 Hz frequency gain to follow the ideal hearing curve indicated by ?ĭ is a hearing research and consulting company that consults for colleges and companies around the world. ![]() I believe now I understand what happened to create confusion. If I increase the gain at 125 Hz even further, voices tend to become even warmer and more natural.Īm I interpreting the Behringer curve correctly by using when compression starts? Is it also true that the ears can take more DB SPL at lower frequencies than at higher frequencies? Is there an accepted standard for hearing below 250 Hz? If I increase the gain of the 125 Hz frequency to move closely resemble the curve from Behringer, voices tend to sound lower pitched and more natural without any apparent loss of clarity. If I reduce the gain of the 125 Hz frequency to become closer to the ideal curve from, the pitch of voices skyrockets and becomes extremely annoying. If I adjust my equalizer so that curve below 500 Hz remains the same as it was originally and add up to 12 DB gain to frequencies above 750 Hz to try to create as flat of a curve as possible above 500 Hz, the nasal (muddy) sound through my Bose headphones disappears and clarity improves significantly but the pitch of voices are slightly too high. My current hearing curve at 125 Hz is 7 DB above the ideal hearing curve and 3 DB below the Behringer compressor response curve. Also it seems they think it is ok to exceed the maximum DB at 125 Hz by 15 DB more than at 750 Hz and above without doing hearing damage. Therefore it seems that Behringer may think they are using the correct hearing curve and therefore starting compression at different times depending on the frequency. The test was not based on hearing but was visual where the input to the compressor was fed different frequency tones increasing the output to the compressor by 3 DB until the compression and peak limiter lights would light and then recording the results. Also with the peak limiter set to + 3 DB, the audio at 750 Hz and above, hit the peak limiter 15 DBs earlier than did the audio at 125 Hz. Therefore they start compressing audio 15 DBs earlier at 750 Hz and above than at 125 Hz. For 500 Hz, it started compressing at 55 DB, at 250 Hz it started compressing at 58 DB, and at 125 Hz it started compressing at 67 DB. I was checking my MDX1600 audio compressor yesterday to see when compression kicks in and with the threshold set at -10 DB, the compressor started compressing at 52 DB for all frequencies 750 Hz and above. What confuses things even further is what Behringer (maker of audio compressors) appears to think. However the folks at seem to think that the ideal hearing at 750 Hz should be -1.5 DB, at 500 Hz should be -3.5 DB, at 250 Hz should be -11.7 DB, and at 125 Hz should be -25 DB. From my understanding, Typically an audiologist looks for 0 DB at 250 and 500 Hz and normally does not check hearing below 250 Hz. I’m a little confused about what should be the DB values below 750 Hz. ![]()
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