Product announcement with more info here I remain mightily impressed with the iFi Gryphon so far, especially the power it can deliver to the 7hz Timeless IEM which brings more alive than the RU6 (no battery) dongle. More impressions will be forthcoming especially with Solaris 2020. regarding the iEMatch being engaged to eliminate hiss from Gryphon and Solaris 2020, received this from iFi Tech Support: 1. The Gryphon iEMatch switch attenuates by 12dB. (12dB for 3.5 skt on 3.5 setting, and 12dB for 4.4 skt on 4.4 setting.) The iDSD Signature attenuates by 12dB on the high sensitivity setting and 24dB on the ultra sensitivity setting. 2. Output impedance on Gryphon is < 1 ohm with iEMatch off and 3.6 ohms with it on. Output impedance of iDSD Signature is < 1 ohm with iEMatch off, 4 ohms on high sensitivity, and 0.94 ohms on ultra sensitivity. 3. No kind of filtering, purely resistive attenuation. 4. The reduction in hiss is due to the attenuation characteristic - either 12dB or 24dB as above. 5. It places resistors in the signal path on the output of the headphone amp section.