What about the bass quality and quantity ?
Headphone Reviews and Discussion - Head-Fi.org
laleeee
jeromeoflaherty
Well as I mentioned it is transparent with no roll off, which is what you want when you have built in PEQ capabilities.
E.g. this the frequency response:
Some of the measurements show a slight roll off of treble > 15K but all bass measurements were 'flat'.
You can add bass with EQ if you want more bass. As for quality, the THX headphone amp is superb, I have listened to older versions of a few other devices and I have no complaints with them or with this device as far as bass quality.
With a flat response like this you can easily do some interestingly with EQ, e.g. you can set the EQ to more easily transform your Headphone Frequency response using a Squig.link measurements.
E.g. this the frequency response:
Some of the measurements show a slight roll off of treble > 15K but all bass measurements were 'flat'.
You can add bass with EQ if you want more bass. As for quality, the THX headphone amp is superb, I have listened to older versions of a few other devices and I have no complaints with them or with this device as far as bass quality.
With a flat response like this you can easily do some interestingly with EQ, e.g. you can set the EQ to more easily transform your Headphone Frequency response using a Squig.link measurements.
laleeee
Only deaf idiøts use eq 
Do you recognised any treble harshness ?
Do you recognised any treble harshness ?
jeromeoflaherty
No, it does not change the treble response of your headphones so there will be no treble harshness unless your headphone has some treble harshness already maybe like a Beyerdynamic??
laleeee
No, i would use it with iems, but i sold two of my fiio dongles because they was too sharp in the treble region
jeromeoflaherty
Well depending on how good your hearing is - it might be the Filters you have selected.
i.e. this screen in the Audio configuration section of the review:
Most FiiO devices now have these filters as configurable so it can be worth experimenting with these to find one that doesn't affect the upper treble region.
i.e. this screen in the Audio configuration section of the review:
Most FiiO devices now have these filters as configurable so it can be worth experimenting with these to find one that doesn't affect the upper treble region.
laleeee
I never had a dap before. The m23 has a higher end sound like the fiio ka17 for example ?
