Feiao FiiO BTR1 Portable Bluetooth Sound Card Dismantling and Experience Report
Feiao BTR1 is an audio Bluetooth adapter, which is used to receive Bluetooth wireless audio signals on mobile phones, tablets, notebooks and other hosts through devices such as BTR1 and output analog audio signals. Its function is to add Bluetooth wireless audio function to wired earphones and speaker audio systems without Bluetooth function. In theory, this kind of product was originally a kind of consumable, just like buying an HDMI cable or USB charging cable. What's more, who would buy a 20-30g Bluetooth converter to transfer a small earplug? Why not buy a Bluetooth headset directly? So BTR1 has been released for a long time and we have no interest in testing it.
Feiao FiiO BTR1 Portable Bluetooth Sound Card
Feiao FiiO BTR1 Portable Bluetooth Sound Card
However, there are two main reasons for writing this article today. First, since it is a consumable material, its attention is not low. What buyers need is a wired to wireless conversion. Although the conversion of headphones is cumbersome, there may be a certain need to switch audio. Second, BTR1 is different from Qualcomm CSR integration scheme. With an AKM DAC chip, will the sound quality be better. Since Bluetooth audio coding testing cannot be carried out according to traditional objective testing methods, today's atlas, disassembly and experience are written in an article.
Prototype Source: the manufacturer sends the test.
prototype type: Commercial production edition
is a commercial relationship: Yes
Appearance Function and Disassembly Atlas
Feiao FiiO BTR1 Portable Bluetooth Sound Card
Feiao FiiO BTR1 Portable Bluetooth Sound Card
Feiao FiiO BTR1 Portable Bluetooth Sound Card
Feiao BTR1 is a Bluetooth sound card with a small appearance and a metal shell. It can be seen from the picture that it comes standard with a back clip and can be conveniently clamped on clothes. Unlike the Bluetooth sound card introduced by early manufacturers of accessories and consumables such as Green Union, BTR1 is not only more detailed in appearance, but also different in function from the outside.
, a volume adjustment key is added to the side of BTR1. Double-click can also realize the function of selecting music. At present, most of the volume adjustment of Bluetooth is to control the software volume of the mobile phone or host in the form of software linkage. Second, Feiao BTR1 uses a button to realize Bluetooth pairing, play pause control, sound effect switching and other functions. There is a delicate small led indicator in the middle of the button, and a sound enhancement function is turned on when the green light is turned on by double-clicking.
Feiao FiiO BTR1 Portable Bluetooth Sound Card-Official Chart-Indicator
Third, BTR1 supports the most convenient multi-device connection. That is, from the perspective of the host device, multiple devices can display that they are already connected to BTR1 at the same time. As long as one device stops occupying BTR1 to play music, the other devices can be switched quickly. Fourth, BTR1 may still consider more users who connect headphones, so the BTR1 sound card itself has been added with a call function. And this button can also be responsible for answering and hanging up the phone and other functions. We have not tried this part of the function, and users need to consult Feiao's official website.
Feiao FiiO BTR1 Portable Bluetooth Sound Card
Feiao FiiO BTR1 Portable Bluetooth Sound Card
Feiao FiiO BTR1 Portable Bluetooth Sound Card
Feiao FiiO BTR1 Portable Bluetooth Sound Card
Feiao FiiO BTR1 Portable Bluetooth Sound Card -3.5mm Audio Output
From the perspective of disassembly, BTR1 is also different from the traditional Bluetooth sound card. It uses the A64215 SoC Bluetooth scheme of Qualcomm CSR. The SoC scheme itself can directly provide audio D/A analog signal output, but Feiao uses its digital signal output channel, plus an AKM AK4376 DAC chip and amplifier circuit to form the analog audio output of the headset. CSR's scheme can support aptX decoding. It seems that Feiao said that AAC audio can be supported on the 2.0 version of BTR1. However, AKM's AK4376 theoretical index is far better than CSR integration scheme. AK4376's high sampling rate and 24bit sampling accuracy are currently unable to play a role under aptX coding.
Feiao FiiO BTR1 Portable Bluetooth Sound Card-Disassembly
Feiao FiiO BTR1 Portable Bluetooth Sound Card-Disassembly
Feiao FiiO BTR1 Portable Bluetooth Sound Card-Disassembly
Feiao FiiO BTR1 Portable Bluetooth Sound Card-Disassembly-CSR A64215 Bluetooth Chip
Feiao FiiO BTR1 Portable Bluetooth Sound Card-Disassembly-AKM AK4376 DAC Chip
Feiao FiiO BTR1 Portable Bluetooth Sound Card
in terms of core functions, BTR1 is also different from the traditional Bluetooth sound card. First, BTR1 has a built-in battery, the official nominal battery capacity is 205mAh[3.7V], the charging time is less than 2 hours, and the actual battery life is more than 8 hours. Second, AK4376 plus an amplifier chip provides a larger output voltage and a larger output power, which can reach an output power of 30mW under a load of 16 ohms. although the nominal THD + N distortion is as high as <1% at this time, this distortion rate is definitely related to bluetooth coding itself and cannot correspond to the traditional wired audio test. On the whole, Feiao still locates BTR1 as a high-quality Bluetooth sound card, which is different from the traditional Bluetooth adapter. In fact, it can even be located closer to the Bluetooth headset adapter with neck-mounted MMCX interface such as Westone and Sony.
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