FiiO BTR15 Portable High-Fidelity Bluetooth Amp/DAC Color:Blue they are off the shelf

they are off the shelf and as such

the ATH-M40x excels in professional studio tracking and mixing

we experimented with placing different materials behind the driver in the earcup – the results showed the headphone responding strongly to any changes

6 mil bonded conical

Pioneer DJ HDJ-X10

FiiO BTR15 Portable High-Fidelity Bluetooth Amp/DAC Color:Blue they are off the shelfBTR15 Bluetooth DAC and Headphone Amplifier QCC5125 + XU316 high performance combo Change modes with just one button Global parametric EQ 3. 5mm+4. 4mm dual outputs 0. 96 inch OLED display Dual curved glass Independent power supply for amp Dual DACs for fully balanced Comprehensive battery protection Change modes with just one button Due to the BTR15's ability to work as a Bluetooth receiver and as a USB DAC, we have implemented a PC BT PHONE mode