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FiiO BTR3-The World' First Bluetooth Headphone Amplifier, SBC/AAC/aptX/aptX LL/aptX HD/LDAC/HWA (LHDC)

Discussion in 'Portable Headphone Amps' started by FiiO, Aug 8, 2018.
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  1. SpiderNhan
    Actually, I just unboxed my BTR3 and the first headphone I fed it was the Fostex T50rp mk3. I must say... Not bad at all. Full volume on both my phone (OnePlus 5T>LDAC) and the BTR3, but this is definitely listenable.
  2. eckndu
    hi, can it be recharged while maintaining a bt connection?
  3. miztahsparklez
    Oh I know.. the dt770 is not friendly . It puts most amps to the test even. They consume gobs and gobs of power, the more you throw, the more they take.

    I'm assuming "normal" listeners who don't turn up their music will get optimal sound out of most headphones and decent battery life. What will wow most people is the level of detail that the BTR3 can provide. I've gone back and listened to old cans that have sounded "muddy" to me in the past, but now can hear all the fine details. I'm amazed how much I have been missing out on using my phone's DAC.
  4. hotdog108
    Yep, although it's not recommended. As is the case with all battery based devices.
  5. rkw
    Why? Lots of people charge their phone or laptop while using it. Does FiiO discourage it? Doesn't it charge while using it as a USB DAC?
    Alberto01 likes this.
  6. hotdog108
    it's not a good idea to drain a battery while adding more juice, it reduces the life of said battery, because physics and chemistry
  7. miztahsparklez
    Honestly, for something thats $70 and no removable battery is designed to wear out so you buy another one. Maybe in 3 years you will buy the next one anyway.

    I would just say use and charge how you want!
  8. SubMash
    This is just not true. When you charge and use battery it is effectively same as if you charge it slower. And charging slower is good for battery.
    Alberto01 likes this.
  9. hotdog108
    You can believe whatever you want, or rationalize whatever way you like, but science is science. Personal belief has never altered how physics works, and nor will it this time.
  10. hotdog108
    I agree, things like this are considered consumables, use it for a few years and get a new one. I'm just speaking in terms of pure battery physics, consuming while charging reduces the capacity.
    miztahsparklez likes this.
  11. rkw
    The information I see is that it is not possible to charge and use a battery at the same time. The external power will drive the device and excess power will charge the battery. If the external source can't provide enough power for the device, the battery provides supplemental power and isn't charged at that same time. So @SubMash is partially correct depending on the amount of power.
    Last edited: Sep 27, 2018
    Alberto01 likes this.
  12. mhoopes
    In order for a battery to charge, the charging voltage applied to it must be higher than the battery potential. An extra load could draw power from both, but current division would favor the source with the higher potential by some %.
    [edit] Unless the current-limiting of the source->battery is sufficiently higher than the battery output impedance.
    Last edited: Sep 27, 2018
  13. alphak
    Thank you for this, however the problem is the kind of headphones I want, which are light weight clip-on on ear type and not in-ear, are few and far in between. The only popular one I keep seeing is the Koss KSC75 but it seems a bit too heavy, the ATH EQ500 is too perfect at 20 grams, and the audio quality is not horrendous at the spec. I should probably post a separate thread for clip-on headphone recommendations but I've looked through some of the existing ones and couldn't find anything much superior.

    I have an Avantree Cara II bluetooth transmitter and i get an ever so slight hiss when using it with the ATH EQ500, mainly because I listen 90% to audiobooks and podcasts at low volumes.

    I've decided to go for the FiiO BTR3 even though it is overkill for these headphones, got it delivered yesterday.


    First surprising thing about this little gadget is the weight, it is super tiny but also substantially heavy, I'd wager with the metal clip it's easly 30 grams or more, about the weight of a 9v battery maybe slightly less (the site says 25g but they might be saying that without the clip). On a thin t-shirt it can definitely be felt when clipping onto a shoulder. The clip is made of really solid metal, and feels VERY premium. in fact, the whole build is absolutely top notch, feels like it's an expensive product and has a lot of tech packed into its tiny dense frame.

    NFC; this feature is slightly different from how I expected it to work, basically you need to hold the power button to power on the device first, and then use NFC to tap your phone and connect. On another NFC bluetooth headset I had, NFC would also power on/power off the bluetooth device itself, but that's not the case here. Would have loved to seen the NFC being the same but its not a horrendous issue.

    Audio quality; now my headphones are by no means super power hungry at 103 dB/mW and i'm no audio expert either, but I have not heard even the slightest bit of noise or disturbance when listening at low volumes, mainly podcasts and audio books. It is excellent, definitely indistinguishable from a 3.5mm analog connection to my pc. The convenience of wireless at the quality of wired is what this device aims to deliver and at least in my case, delivers perfectly. Definitely recommended!
    iaTa likes this.
  14. SubMash
    Well, explain how? Battery charged in cc-cv mode. Means limit of current and voltage whatever comes first. Charge is application of higher voltage than existing on the battery. If you use battery during charge (which would be almost all of the battery powered devices in existence) you make a load on electrical source - charger. If your load is too high to maintain same voltage - charger will drop voltage (or when internal resistance of charger will decrease it under load).

    Such event effectively identical to decrease of charging speed. Which is known to prolong life of battery.

    If load will push charger voltage below battery voltage - battery won't be charging and will be releasing energy. There are no physical event of charging and discharging at the same time. Battery is either driven to get charge or to release it.

    And it doesn't care if you going to have tiny currents changing directions very often, because almost all circuitry would effectively push tiny currents back to battery at high frequency on voltage regulators.

    There are few things known to decrease capacity:
    1. High (or extremely low) Temperature
    2. High Input or Output Current
    3. High or Low Charge
    4. Oxidation of electrolyte and electrodes over time

    None of those increasing during charge and use at the same time.

    So there are no evidence of what you say (or give a link on a study that shows it) and no physical effects describing potential for such result. Moreover - almost all devices using battery while charging, because charging logic is powered by battery itself. So, you can't even avoid it and therefore whole comment is useless.

    P.S. When we talk about devices like this one regular USB charger is 2.5W, while whole device consumption at most 0.2W, so if charger is connected - it never uses a battery at all. USB-C of btr3 is not increasing charging speed at all, batteries are too tiny to be charged even at regular USB currents.
    Last edited: Sep 28, 2018
    Alberto01 likes this.
  15. hotdog108
    Every battery has an upper limit of charge cycles, this is an irrefutable fact. Every time you charge it, you're reducing the battery life and charge cycles. This is common sense at this point. Having it charging during use puts a constant bidirectional load on the battery, reducing the life of the battery faster than normal use and charging cycles. It's physics and common sense, this whole idea of a device not using the battery while plugged in because of a difference in output and input isn't scientifically sound. I'm not saying charging while using isn't possible, it certainly is, but so is driving with one hand out the window, it's just not recommended.
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