I have not much experience or knowledge about sound engineering, but I came across this question that won't stop bugging me. One time at some event my BF (an amateur sound engineer) had to tune the sounds of the following system. It was a streamer with a untamperable EQ flat connected to a mixer. My BF explained that if I balance the volume between both appliances in a way that would keep the exact output volume (doing so by for example turning down the volume of the mixer, and turning up the streamer), the EQ effects would still change. Just to better clarify myself, the output volume would stay the same, but the bass might be stronger, as the device with more volume would affect the equalized sound at the output than the other device (even if one of them is EQ flat)

That thing makes no sense to me, as the mixer gets on the input the exact same EQ signals, but produces different outputs...

A physical/electrical explanation to this phenomenon would be extraordinary. I am not afraid of math or physics, so don't go lightly on me with your explanation!

  • By pushing the power amp into speakers may give a 'better' sound, but I don't follow BF's reasoning. – Tim May 25 '19 at 10:00
  • The question seems rather confused; but, if you run the same signal up 2 channels, apply EQ to one but not to the other, you can vary the amount of EQ by changing the relative volume of the channels [assuming everything remains in phase]. – Tetsujin May 25 '19 at 10:52
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    I'm voting to close this question as off-topic because it is about consumer audio and not music practice or theory. – Todd Wilcox May 25 '19 at 14:53
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    I think your boyfriend is the best person to explain what your boyfriend was talking about. – Todd Wilcox May 25 '19 at 14:54

Consumer level amplifiers tend to have "loudness" EQ where low settings of the volume control get more bass and treble added in because they aren't detected as well by human hearing at low volumes. At least in typical analog HiFi amp design times, this characteristic was achieved using an additional tap off the volume control pot (stereo logarithmic pot with tap: one of the worst replacement parts to get since the tap position was not actually fixed). So its operation depends on the setting of the volume control, not on the actual volume being produced. Consequently, changes on the volume control cannot be compensated by changing the volume of the input because they result in a different operation point of the "loudness" EQ.

No idea whether it was this what your BF was talking about but it certainly fits the bill.

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