The R2R matrix is needed in order to eliminate the influence of volume control on the final result.
This allows you to get a realistic dynamic range and digital-to-analog conversion with lossless volume control.
3.5mm, 4.4mm balanced
Weight: 20 g.
Tested on Letshuoer ej07m, Fiio ft5
It is a very musical source, there is some kind of appeal in the sound.
There is a certain solidity about Hartfield, there is a feeling that you are listening to a more serious source than a portable dac amplifier.
The sound of the R2R differs from commercial chips, and differs in a more adult pitch.
The HeartField R1 is quite bass, with proper and very tasty bass transmission.
The middle is lamp-like, warm, but at the same time clear and not blurred, with a decent transfer of nuances in this range.
The bass is deep, elastic and at the same time soft.
Such low frequencies, but all sources would.
High frequencies have a pleasant smoothness and beautiful separate percussion.
They are well controlled without showing any sibilants.
The stage is wide and voluminous, with large images, like those of expensive devices.
The HeartField R1 creates a feeling of analog sound, there is no trace of a digit.
It has high power
Creates large images
Good detail
Solid sound
The HeartField R1 is capable of unlocking the potential of audiophile headphones, so I can recommend this source to those who are looking for a compact device with a serious sound level.
To date, this is the best PORTABLE DAC amplifier in terms of sound and engagement that I have tested!