FiiO Q7 Portable Desktop-Class DAC and Headphone Amplifier Discussion & Impressions Thread
Dec 21, 2022 at 11:22 AM Post #430 of 714
3. When Ultra High Gain is turned on, a low-frequency hum (50hz) is heard in the FH9 headphones. Touching the connector or the metal part of the Q7 case with your hand removes the hum. In other modes, everything is perfect. With other headphones there is no hum.
You should not use such extreme gain for very sensitive transducers like IEMs. It is mainly for low sensitivity headphones that need a lot of power.
 
Dec 21, 2022 at 12:24 PM Post #431 of 714
You should not use such extreme gain for very sensitive transducers like IEMs. It is mainly for low sensitivity headphones that need a lot of power.

Thank you. In order to use this mode , headphones are suitable , for example Sennheiser hd-660 s ?
 
Dec 23, 2022 at 5:44 AM Post #435 of 714
Currently auditioning...

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