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I think you are confused between driving power and loudness. One of the symptoms of lacking of driving power but with high loudness is that you need to crank up the volume from the device very high like 80%+ in order to start hearing to your satisfactions. But that is not all, once the body of an instrument isn’t powerful enough and that triggers you to start tweaking EQ then losing so much in separations, staging, is because the device can’t have enough driving power to drive your headphones correctly.P.S. You actually surprised me that a pre-amp further improves the sound. I don't understand how it works from technology perspective, as it seems that SP3000 is more than enough to power HE1Kv3.
This is where having a preamp, or a powerful amp can play to hugely improve it, just due to power alone. From you discussions alone, I think the SP3K can output a good amount of voltage for loudness but lacking the current to controls the headphones…. Which to simply put, it can get loud but it can’t get good enough (a lack of proper driving power)
Once we are pass this, then we will start facing the Line out issues, and that will be another confusing topic. Why is that ? Because in order to benefits the most out of a preamp, the input signals toward the preamp has to be a true Line out instead , so to avoid double amping
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