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This is a great point. Would you say we should just plug in the IE match and leave it there permanently regardless of headphones we use?
No, iEMatch has a specific job, that is to make headphones and IEMs of high sensitivity (and thus tend to show excessive background noise and leave little volume control range between "silent" and "way too loud") compatible with "normal" headphone amplifiers.
If headphones/IEMs falls into the high / ultra (high) sensitivity category, iEMatch should be tried and will most likely be beneficial, reducing noise, increasing available dynamic range and offering a much increased volume control range.
If the headphone (or IEM) falls into the "normal sensitivity" or "low sensitivity" group iEMatch will offer no benefit, on the contrary, it may result in insufficient loudness available before the amplifier overloads.
Thus the use of iEMatch is a function of the headphones/IEMs used and to a lesser degree that of amplifier used.
It is not specifically designed for iFi equipment either, it will work with most/many headphone amplifiers, DAP's and DAC/amp combos on the market.
Even if we're already using an iTube2 into an iCan SE?
The iTube 2 cannot do anything for sensitivity / gain / output level mismatches between headphones/IEMs and headphone amplifiers. So using it or not has no bearing on employing iEMatch or not, what matters is the specific headphones/IEMs used.
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