[dsonance]

for high impedance headphones, usually you can calculate the output power by yourself .

the output power = u²/r, so the power for 600 ohms will be 1/2 of 300 ohms, which means BTR7 can output

40mW/2=20mW.

Thanks, @JamesFiiO! From what I've seen with other amplifiers, the output power does not always scale exactly lineary with the impedance, despite what Ohm's law would indicate. But, given that the only officially quoted rating is ≥320mW at 32Ω, we'd actually get the slightly lower ≥17mW at 600Ω, scaling lineary (not so "slightly", perhaps, as it's more than 10% different).

On the other hand, Amir at the Audio Science Review measured maximum power at 300Ω with balanced boost to be 83mW (see https://www.audiosciencereview.com/...s/fiio-btr7-review-portable-dac-hp-amp.36620/), which gives us quite a bit greater 41mW at 600Ω, scaled lineary.

As you can see, there's a significant spread across these numbers... I was hoping to get an official story on this, but I understand if Fiio only rates output at 32Ω, and doesn't want to over-promise (after all, "≥" is a conservative estimate in and of itself).

 

[JamesFiiO]

Thanks, @JamesFiiO! From what I've seen with other amplifiers, the output power does not always scale exactly lineary with the impedance, despite what Ohm's law would indicate. But, given that the only officially quoted rating is ≥320mW at 32Ω, we'd actually get the slightly lower ≥17mW at 600Ω, scaling lineary (not so "slightly", perhaps, as it's more than 10% different).

On the other hand, Amir at the Audio Science Review measured maximum power at 300Ω with balanced boost to be 83mW (see https://www.audiosciencereview.com/...s/fiio-btr7-review-portable-dac-hp-amp.36620/), which gives us quite a bit greater 41mW at 600Ω, scaled lineary.

As you can see, there's a significant spread across these numbers... I was hoping to get an official story on this, but I understand if Fiio only rates output at 32Ω, and doesn't want to over-promise (after all, "≥" is a conservative estimate in and of itself).

yes, you are right, especially for lower impedance, but most time it is not a big problem for high impedance .

in audio device, it is very difficult to make a amplifier , which can double the output power when the impedance is 1/2.

because the max output current limited the power. but for 3oo or 600 ohms , it is quite a easy drive loader for audio amplifier.

so the max voltage output will almost keep the same. which means it is almost lineary .

but if you compare 32 with 600, we can say most time the max output voltage change quite a lot so it is not close " lineary "

 

[Headphoneprobs]

Thanks for response, @JamesFiiO . For transparency, here's what it looks like. Curious if this changes your perspective or whether anyone else is experiencing the same.

 

[jsmiller58]

Thanks for response. For transparency, here's what it looks like. Curious if this changes your perspective or whether anyone else is experiencing the same.

That doesn’t look good. I would suggest getting a replacement.

 

[TooPoorForHiFi]

Does Anyone else have wireless charging issues?

Wireless Charging would be one of the main reason I would get one, fwiw.

 

[ChrisOc]

Does Anyone else have wireless charging issues?

I have just placed ny BTR7 on the charger and it seems to be charging. What issue are you experiencing, forgive me if you previously mentioned it, I have not kept up.

 

[jjazzy]

I actually tried the BTR7 for a while and was actually dissapointed, I thought the sound somewhat hard and direct if that makes any sense. Not it’s not detailled but harsch or compressed in some way with IEM’s. It was connected through usb fully lossless audio tracks. Using se846.

I tried the dragonfly cobolt, ifi xdsd and ifi xdsd gryphon and loved the smoothness they had. Especially the gryphon without any settings or boosts.

Maybe I am sensitive to the high frequencies, no idea?

Actually was planning to buy the btr7 now I am going for the xdsd gryphon I think (yes more expensive, but so so much more musical to my ears)

Just really really curious if I am really one of the few who don’t like the sound signature of the btr7?

 

[TooPoorForHiFi]

I have just placed ny BTR7 on the charger and it seems to be charging. What issue are you experiencing, forgive me if you previously mentioned it, I have not kept up.

Yes, this post here. I'm curious if this is a common issue. The Wireless charging is a major buying point for me.

 

[ChrisOc]

Yes, this post here. I'm curious if this is a common issue. The Wireless charging is a major buying point for me.

Is anyone else having issue whereas wireless charging stops before fully charged? My wireless charger starts blinking red instead of steady red midway

As I indicated I placed my BTR7 on the wireless charger (for the first time) to see if there were any issues. I had no issues at all.

Granted my unit was about 80% charged when I started, It charged to 100% without any hiccups.

It seems to me that if it is a (hardware or software) fault which affects all units, then my experience would suggest that, if the charging pauses, taking the BTR7 off the charger and placing it back on the charger may resolve the problem, given my unit charged from 80% to 100% with no issues.

Alternatively, if it is an issue with BTR7, the issue affects some, not all units. However, my guess is that the issue is with the charger, it may be simply incompatibility.

I hope that helps to find the reason why your unit stops charging before completion.

 

[FiiO]

Thanks for response, @JamesFiiO . For transparency, here's what it looks like. Curious if this changes your perspective or whether anyone else is experiencing the same.

Dear friend,

Does the issue keep after restarting the BTR7? And you could try to reset it by clicking the power and the volume - button to check again.

Best regards

 

[Alex May]

Just really really curious if I am really one of the few who don’t like the sound signature of the btr7?

May I suggest you try BTR5 instead of BTR7? Just add a 2.5 to 4.4 adapter to it, such as ddHiFi's DJ44B, and you're good to go. I would never choose the BTR7 either, but the BTR5 comes in almost perfectly if it wasn't for the lack of a 4.4mm output.

 

[CephDigital]

Does Anyone else have wireless charging issues?

Wireless Charging would be one of the main reason I would get one, fwiw.

No problems on my end. I can use reverse charging on my S22 Ultra and it's charging the BTR7 perfectly fine.

 

[ddlo]

i listened mostly to streaming service so i mostly used my phone for playing music. i got the ifi go blu first to find a cure to the usb dac/amp burning way too many battery life from my phone. the device is amazingly small, power and with very long battery life.

i however was itching to get more power and wish to get the btr7 (i've used m11pro, m15 and m17 and has been a loyal fiio fans ). i bought a btr7 2nd for that very reason. the thx amp produces familiar sound with authority. but there're also quite a few things that the btr7 trails behind the ifi go blu:

1. with just slightly more power than the ifi go blu, the size and weight are more than double!
2. the control lacks careful thinking and is lightyear behind the excellent, intuitive control of the ifi go blu! the vol wheel, the multi-function button are so easy to use i never read the manual. for the btr7, i can only learn how to turn it off and use track control after reading manual! @FiiO, use vol wheel instead of the rocker buttons and make the button assignment sensible please!
3. ifi go blu almost gives double the play time with fw10000 i used during my trip to tokyo lately! i went out of hotel 9am and returned around 9pm. listening to ifi go blu via LDAC on SE out for almost all the time (vol 65/150). yet i still got over 50% battery left when i got back to hotel. on the contrary, btr7 run out of battery when i dine around 7:30pm (vol @ 36/60).
4. btr7's vol control (out of 60) is independent of my phone's vol if connected by LDAC. @FiiO, wonder what is the recommended way to set it? to max out my phone vol and then adjust the btr7 to my like or keep the phone vol at normal level and dial up the btr7 vol?
5. while the led screen is nice, i dont think it's really a necessity. if it uses too many power/cost, i'd much prefer to drop it and use simple indicator LED similar to ifi go blu.
6. the voice prompt of ifi go blu is so much better than the menu of btr7! on the plus side, the bluetooth connection of btr7 has better range. but i've no issue to use either if i keep them close to my phone.

all in all, it's another quality product from fiio. but just as usual, the user interface/experience side still needs a lot of refinement to be frank.

 

[quimbo]

Here is the USA link - ordered Blue. Thank you for posting

The MITER Case for FiiO BTR7 arrived today. Not too bad, different feel than the OG case, the lanyard is not really "detachable", you have to untie a knot and slide it thru. I'll be looking for something to replace that that has a way to pull apart the ends

 

[Andrew_WOT]

The MITER Case for FiiO BTR7 arrived today. Not too bad, different feel than the OG case, the lanyard is not really "detachable", you have to untie a knot and slide it thru. I'll be looking for something to replace that that has a way to pull apart the ends

Just throw it away, add carabiner and use it on a belt loop.
@FiiO, any update on official case with clip?