25.Why is the EQ of BTR5 invalid under LDAC Bluetooth code?
We are so sorry to inform you that after a test of the BTR5 by our engineers, we found that it is impossible to achieve EQ adjustment in LDAC currently.
The main reasons are explained as follows.
The data stream of LDAC audio is relatively large with a high sampling rate, but the DSP built-in CSR8675 inside the BTR5 has limited ability which aims at handling EQ adjustment under low sampling rates. In addition, the default audio channel recommended by Sony does not pass through DSP.
Our engineers have figured out that we can try to re-sample the LDAC audio like operating DSP after down-conversion to complete the EQ function. However, such changes will greatly affect the sound quality of LDAC. Therefore, if you want to experience EQ adjustment while keeping good sound quality, it is recommended to use aptX HD. You can turn off LDAC of the BTR5 through FiiO Control App, so that aptX HD will be defaulted to take priority when connecting.