[digititus]

I am using LDAC with my LG V30

That's becuase LDAC codec doesn't work with the equalizer

 

[RadarJammer]

Just got the UP4 and updated right away. Pairing works very well.

There is indeed quite a volume difference between codecs. LDAC has no problems (Xiaomi Mi 9), but from a aptX LL source (a bluetooth transmitter with optical input) the volume is underwhelming. Also USB-DAC has very low volume and no 24 Bit/96 kHz, just 16 Bit/48 kHz, while the microfone has a wide variety of sample rates. Is there a mixup of output channels in the latest firmware??

 

[YamabushiJapan]

There is indeed quite a volume difference between codecs.

Thank you for confirmation of a volume issue, although my problem was with LDAC, the only codec I've used with my UP2.

 

[RadarJammer]

My impression is that as USB-DAC, microfone and audio output parameters are mixed up: the output has the microfone sample rates and vice versa

I think it is prudent not to use the device until a new firmware fixes the bugs to avoid electrical damage by wrong parameters.

 

[cyril279]

Just got the UP4 and updated right away. Pairing works very well.
[...] Also USB-DAC has [...] no 24 Bit/96 kHz, just 16 Bit/48 kHz, while the microfone has a wide variety of sample rates.

We recently learned of this usb-dac limitation.

2020/03/16:

UP2 or UP4 don't support 24/96 over USB input, it's limited to 16/48. For Hi-Res playback you would need to go with Bluetooth connection.

 

[YamabushiJapan]

Maybe my experience better described is that my UP2 with firmware v1.5 demonstrates prodigious power and clarity. When using firmware v1.7.3, however, it feels a bit anemic. The most obvious difference being the volume issue.

 

[dyc746]

Hi. I got problem with firmware update up4 , driver “CSR BlueCore in DFU mode” installed and present after usb plugin but without succes ,app is not working showing 1.2.5 firmware which not exist?
https://ibb.co/1fMsYP7
https://ibb.co/hmcfWXB

 

[RadarJammer]

We recently learned of this usb-dac limitation.

Shanling said:
UP2 or UP4 don't support 24/96 over USB input, it's limited to 16/48. For Hi-Res playback you would need to go with Bluetooth connection.

2020/03/16:

This error seems to be common issue with chinese audio manufacturers: last year, I got a brand new Avantree BTDG-60 USB-bluetooth transmitter dongle. They adevertized it with 24 Bit audio, but when I got it it was just like above 16 Bit /48 kHz max. After my complaint, they had to change their advertized specs. I have actually aquired other new stuff with this unexpected USB limitation. (e.g. FX-Audio 302 Pro)

How can it be that the microfone of the UP4 offers up to 24 Bit /192 kHz via USB ?? This is weird.

 

[ClieOS]

....
How can it be that the microfone of the UP4 offers up to 24 Bit /192 kHz via USB ?? This is weird.

How do you even got microphone via USB to work, left alone getting 24/192? Last I checked, it doesn't work on mine, nor Shanling ever said it will work via USB.

 

[RadarJammer]

How do you even got microphone via USB to work, left alone getting 24/192? Last I checked, it doesn't work on mine, nor Shanling ever said it will work via USB.

Thanks for pointing that out. It helped me to realize that said microphone belonged actually to a different device which had it's drivers missing after an OS reinstall.

What remains are those considerable volume differences between codecs and between BT and USB modes.
Also some distributors are still showing misleading info about DAC sampling rates:
https://www.shanling.de/mobile-dac-headphone-amp/shanling-up4/#technical

 

[Shanling]

I am using LDAC with my LG V30

As is listed in firmware notes, EQ is not available for LHDC and LDAC.

Hi. I got problem with firmware update up4 , driver “CSR BlueCore in DFU mode” installed and present after usb plugin but without succes ,app is not working showing 1.2.5 firmware which not exist?

Hi, there is no such things as firmware V1.2.5. Can you please try to update your unit again?

There is indeed quite a volume difference between codecs. LDAC has no problems (Xiaomi Mi 9), but from a aptX LL source (a bluetooth transmitter with optical input) the volume is underwhelming. Also USB-DAC has very low volume and no 24 Bit/96 kHz, just 16 Bit/48 kHz, while the microfone has a wide variety of sample rates. Is there a mixup of output channels in the latest firmware??

When you compare your phone and the bluetooth transmitter on same codec, is there still this volume difference? Just want to make sure if the difference is in codecs or in sources.

Does this Bluetooth transmitter have its own volume control?

On USB DAC it should be able to run the same high volumes, please make sure both volume setting on your computer, playback software and UP4 is set high enough.

Also some distributors are still showing misleading info about DAC sampling rates:
https://www.shanling.de/mobile-dac-headphone-amp/shanling-up4/#technical

Will let them know. This is specification we never made, not sure where they got it.

We now added this info to specification list on our website, to make it clear.

 

[RadarJammer]

When you compare your phone and the bluetooth transmitter on same codec, is there still this volume difference? Just want to make sure if the difference is in codecs or in sources.

Does this Bluetooth transmitter have its own volume control?

Now I've tried tested more combos with the UP4 I have to walk back (again) on a statement and narrowed down the codec problem:

My testing was done with Tidal HiFi, the same piece of music, high gain setting, an AKG 712 Pro (62 Ohm), two Win10 computers, a Xiaomi Mi 9 (aptX, aptx HD, LDAC used) and a Huawei P smart 2019 (AAC, HWA used) and the following OEM bluetooth trasmitter - model: "X5" - (SBC, aptX LL used), which has both optical and USB-audio input (USB has those famous 16 Bit/ 48 kHz max again) but no volume control: https://de.aliexpress.com/item/33050051192.html

Findings:

- USB-DAC turns out just fine. The Windows test sound remains almost inaudibe - that irritated me - but music itself is loud.

- All codecs are loud with the exception of aptX Low Latency. Now I connected the BT transmitter by USB to a PC for audio, turned up the volume to max, but the result was the same as with optical input before: with SBC, the volume was fine, but for aptX LL even with high gain and maximum volume the sound was too quiet. Audible but insufficiently loud.

 

[Speedfight]

Hi, after updating my UP2 firmware to the latest version, Windows recognizes it as an UP4. Seems like a bug in the UP2 firmware?

 

[yorosello]

Hi, after updating my UP2 firmware to the latest version, Windows recognizes it as an UP4. Seems like a bug in the UP2 firmware?

I think that's just naming issue because mine & one of my friends also got the same thing but doesn't impacted the other features. When you connect it to your phone via BT, it will still recognize it as up2 instead of up4

 

[Shanling]

- All codecs are loud with the exception of aptX Low Latency. Now I connected the BT transmitter by USB to a PC for audio, turned up the volume to max, but the result was the same as with optical input before: with SBC, the volume was fine, but for aptX LL even with high gain and maximum volume the sound was too quiet. Audible but insufficiently loud.

Thank you, will try to look into this.

Hi, after updating my UP2 firmware to the latest version, Windows recognizes it as an UP4. Seems like a bug in the UP2 firmware?

Thanks for pointing this out, just some naming bug. Will get it fixed.