It'll only cause a 1.48db difference which mighty covered up by small driver variances as well..

10 * log(45/32) = 1.48db

You can try the SPL Meter iPhone app and put the iphone headset mic in between your ear and driver for a poor man meter that works well for relative comparisons in drivers, and play tones.

Quote from: paranoidroid on January 13, 2013, 06:44:19 AM

That seems unlikely they'd do that. It'd be easier to just match driver impendences from the batches so they are pared up equally. Try the SPL Meter app method with the iphone mic, there might be a 1.5db difference that you're just used to or can't hear from slight off center (even if you can hear the change when you do it in sinegen, deltas with just one tone are easier to hear).

That's definitely possible. I don't have an iphone though so can't do this test off the bat. I did however try adding 1.5dB to either side and then doing tone sweeps, and whichever side I added 1.5dB on turned out to be louder throughout the sweeps. Also tried same dB per channel but swapped the headphones so my ears are listening to the opposite channels, and the sweeps still turned out dead center for most of the part. I really don't see how it is imbalanced.

Are the impedance measurements with a simple multimetre on 60Ohm resistance setting, actually impedance though? I read somewhere on Head-fi that these measurements are not representative of anything tangible.