Portable phone Dac

[JediMa]

I'm struggling to make work any otg adapter to use my external portable dac with a phone with micro usb. This said I'm considering to use a bluetooth portable dac but my concern is about sound quality, if I'm wrong what I could buy in the 100 euro range?

 

[staticV3]

The Fosi DS2 is a fully transparent USB portable DAC and will work with your Micro USB phone as well as any other:

'Fosi Audio DS2 Portable DAC & Amp Review'

Sep 18, 2024

This is a review, detailed measurements and listening tests of Fosi Audio DS2 portable DAC and balanced headphone amplifier. It was sent to me by the company and costs US $55.

Well, it looks like a dongle. The LED seems to indicate the sample rates. What I like is inclusion of 4.4mm balanced drive and hard button volume controls:

Let's measure it and see where it stands.

Fosi Audio DS2 Measurements
Let's start with the balanced output:

Wow! I did not expect this level of performance! We are talking good desktop class DAC output here...

• amirm
• Replies: 990
• Forum: Combination Audio DAC and Headphone Amplifiers

• 

 

[JediMa]

Well i'm really trying to make it work but can't find a cable or adapter to plug it into the micro usb phone, that's why i'm thinking about a Bluetooth one

 

[staticV3]

Ah, I see your post edit, it didn't say Bluetooth before.

If you're looking for a Bluetooth DAC, then the Qudelix 5K is the best option.

It's got far and away the most mature and developed companion App, chock full of useful features.

 

[DVDdoug]

but can't find a cable or adapter to plug it into the micro usb phone,

Do you have one like this?

You should be able to find any USB cable/adapter you want. I've got a little "kit" of adapters in my laptop bag and a ship-load of different cables. I've also labeled most of my cables and devices so I don't need a magnifying glass to see if it's mini, micro, or C.

It's "Interesting" how non-standard USB has become but it seems like USB-C is the emerging standard and I believe the EU has regulations "mandating" it (maybe only for chargers). But by the time all of the other variations are gone we'll probably have something else replacing USB.

 

[JediMa]

Do you have one like this?

I tried exactly that one and didn't work

 

[JediMa]

I'm thinking about this one

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[staticV3]

I'm thinking about this one

​

That one is Micro to Micro. Won't fit the DS2.

 

[rcstevensonaz]

[...] use my external portable dac with a phone with micro usb

Just to confirm: are you sure your phone is able to send audio output over the USB connection in a compatible manner? And does it work with just a simple micro-USB to 3.5mm audio dongle?

 

[JediMa]

Just to confirm: are you sure your phone is able to send audio output over the USB connection in a compatible manner?

In a way.. because when I try a cheap otg adapter, it works but music keeps stopping time by time. To double check what should i do to test it?

 

[JediMa]

So IF i wanted to replace the fosi with a bluetooth dac which are my options please?

 

[staticV3]

#4

 

[JediMa]

OMG... my bad sorry . thank you so much Static

 

[rcstevensonaz]

[...] the Qudelix 5K is the best option

Is this device at least as good as a TOPPING D10B (or a D10S for 2V RMS unbalanced output) for use cases when I am working at my desk from my laptop / phone?

According to their spec sheet, it provides 2.5mm Balanced 4.0V RMS. In which case:

• When I am at my home desk, I use a 2.5mm <> XLR cable to connect into my balanced stereo mixer, driven at full 4V balanced line level (instead of using a D10B)
• When I want to be mobile on headphones (whether around the house or traveling), I just unplug the 2.5mm balanced cable and plug in my headphones (3.5mm cable)

 

[Roland68]

Do you have one like this?

You should be able to find any USB cable/adapter you want. I've got a little "kit" of adapters in my laptop bag and a ship-load of different cables. I've also labeled most of my cables and devices so I don't need a magnifying glass to see if it's mini, micro, or C.

It's "Interesting" how non-standard USB has become but it seems like USB-C is the emerging standard and I believe the EU has regulations "mandating" it (maybe only for chargers). But by the time all of the other variations are gone we'll probably have something else replacing USB.

I tried exactly that one and didn't work

This isn't an OTG cable, but a regular one.

And there's no USB-C standard, just a connector.

 

[rcstevensonaz]

And there's no USB-C standard, just a connector.

Could you clarify this?

A quick Goggle search brought me to a document "Universal Serial BusType-C Cable and Connector Specification" that defines the standard for USB-C -- i.e., cables that are used for USB communication with Type-C connectors.

From the Definitions section of the document:

• Type-C Plug: A USB plug conforming to the mechanical and electricalrequirements in this specification.
• Type-C Port: The USB port associated to a USB Type-C receptacle. This includesthe USB signaling, CC logic, multiplexers and other associated logic.
• Type-C Receptacle: A USB receptacle conforming to the mechanical and electricalrequirements of this specification.

Now, a different question is which specific USB version is being used; but they are all still USB.

 

[rcstevensonaz]

This isn't an OTG cable, but a regular one.

Thanks for that clarification.

I wasn't familiar with OTG cables. Today I learned that the USB On-The-Go (USB-OTG) standard adds a fifth pin on the USB mini / micro plug, which gives the ability for the smart phone to change its role between being a device (i.e., when connected to a PC) or being the host (i.e., when attaching a device such as SSD drive or DAC).

 

[barbagris]

Ah, I see your post edit, it didn't say Bluetooth before.

If you're looking for a Bluetooth DAC, then the Qudelix 5K is the best option.

It's got far and away the most mature and developed companion App, chock full of useful features.

The only thing I would point out, though - is the 2.5mm balanced output.
I just say this as I'm also looking for a Portable (autonomous) Bluetooth DAC/AMP - albeit just to listen to the TV - So I'm OK with 3.5 anyway.

Still, I thank you for that recomendation.

 

[staticV3]

The only thing I would point out, though - is the 2.5mm balanced output.
I just say this as I'm also looking for a Portable (autonomous) Bluetooth DAC/AMP - albeit just to listen to the TV - So I'm OK with 3.5 anyway.

Still, I thank you for that recomendation.

I don't follow. What are you pointing out?

The 5K has both 3.5mm and 2.5mm

 

[barbagris]

I don't follow. What are you pointing out?

The 5K has both 3.5mm and 2.5mm

I wish it had a 4.4 balanced hole. That's all.