Ike1985
Headphoneus Supremus
- Joined
- Oct 22, 2014
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Hello Brooko,
Nice work!
There should be more variation between your S1 and B1 measurements. It's possible you have a "minus" S1 set and a "plus" B1 set which would bring them quite close together in performance. The apex m20 modules are 100% tested and calibrated to be within 1dB of the 'perfect' S1 module and may serve as a good reference for how the S1 should perform.
Also, your closed MAM measurements don't look completely correct. Try plugging the ambient hole on an S1 module and comparing that to the closed MAM measurement, they should be nearly identical. It might be possible that your MAM is not sealing all the way.
We were experimenting with some resistor values in combination with a U12 and Chord Mojo... even at 10 ohms you can see a significant change in frequency response with minimal amplitude losses. Figure that adding 20 ohms of resistance to each channel basically brings the Mojo output impedance equal to the kind of equipment we tuned the A12/U12 with...
- Chris
Judging from Paul's excellent work it looks like the M20 Apex is exactly the same as the closed MAM (knob all the way out), essentially meaning no Adel effect.