[nekromantik]

I found this on the Astell Kern website, it says


Unbalance 2.0Vrms / Balance 4.0Vrms (Condition No Load)

Yeah I seen that but its no load so useless measurement. I want to find out if power output is similar or less then Hiby R6 2020

 

[Licht]

I found this on the Astell Kern website, it says


Unbalance 2.0Vrms / Balance 4.0Vrms (Condition No Load)

That is for infinite impedance.
It significantly drops in low ohms such as 16 ohms.

 

[JasonNYC]

Yeah I seen that but its no load so useless measurement. I want to find out if power output is similar or less then Hiby R6 2020

at a 32ohm load, it is about 125mW for 3.5mm, 500mW for 2.5mm on SR15

 

[nekromantik]

at a 32ohm load, it is about 125mW for 3.5mm, 500mW for 2.5mm on SR15

thanks

 

[Licht]

at a 32ohm load, it is about 125mW for 3.5mm, 500mW for 2.5mm on SR15

No, I think it is wrong.

Your calculation is just theoretical output calculation for 2V and 4V to 32ohms, but actual current hits limit in low ohms and voltage gets down.
V=IR
I = V/R = 2.0/32 = 0.0625A (or 62.5mA)
W =IV = I*I*R = 0.0625 * 0.0625 * 32 = 0.125W = 125mW (your calculation)
This is theory, “IF” SR15 can output 2.0V in 32ohms without hitting current limit.

You can see following guy measuring actual output voltage before distortion.
https://sandalaudio.blogspot.com/2018/08/astell-sr15-dap.html?m=1
The site is not mine but he is famous (and probably only one real meaningful reviewer) in Japan.

and the graph for unbalanced output (peak to peak volt):
https://1.bp.blogspot.com/-yaWFcV5Q...fYYh8Ii860zIh0d3hZ3bmoFwCLcBGAs/s1600/012.jpg

It is peak to peak voltage, so divide it by two and divide again by 1.41, or just divide by 2.83 to get voltage RMS.
So in higher impedance, it is near the theoretical output, 5.65V peak to peak, which is 5.65/2.83 = 2.0V rms.

However, you can see it significantly drop in low ohms.

It looks like 3V peak to peak for 32 ohms in unbalanced, thus:
3/2.83= 1.06V rms
V=IR
I = V/R = 1.06/32 = 0.033A (or 33mA)
W =IV = I*I*R = 0.033 * 0.033 * 32 = 0.035W = 35mW


This is just rough estimation read from the graph measured by one reviewer, but it matches my feeling.
SR15 (or SA700 which both I have) in low impedance like 32ohm or 16ohm is weaker than other DAP like AP80Pro which I also have and compared.

A&K DAPs are really nice for efficient IEMs or high impedance and efficient headphones, but not for power hungry low impedance headphones (like MrSpeakers Ether).

 

[nekromantik]

No, I think it is wrong.

Your calculation is just theoretical output calculation for 2V and 4V to 32ohms, but actual current hits limit in low ohms and voltage gets down.
V=IR
I = V/R = 2.0/32 = 0.0625A (or 62.5mA)
W =IV = I*I*R = 0.0625 * 0.0625 * 32 = 0.125W = 125mW (your calculation)
This is theory, “IF” SR15 can output 2.0V in 32ohms without hitting current limit.

You can see following guy measuring actual output voltage before distortion.
https://sandalaudio.blogspot.com/2018/08/astell-sr15-dap.html?m=1
The site is not mine but he is famous (and probably only one real meaningful reviewer) in Japan.

and the graph for unbalanced output (peak to peak volt):
https://1.bp.blogspot.com/-yaWFcV5Q...fYYh8Ii860zIh0d3hZ3bmoFwCLcBGAs/s1600/012.jpg

It is peak to peak voltage, so divide it by two and divide again by 1.41, or just divide by 2.83 to get voltage RMS.
So in higher impedance, it is near the theoretical output, 5.65V peak to peak, which is 5.65/2.83 = 2.0V rms.

However, you can see it significantly drop in low ohms.

It looks like 3V peak to peak for 32 ohms in unbalanced, thus:
3/2.83= 1.06V rms
V=IR
I = V/R = 1.06/32 = 0.033A (or 33mA)
W =IV = I*I*R = 0.033 * 0.033 * 32 = 0.035W = 35mW


This is just rough estimation read from the graph measured by one reviewer, but it matches my feeling.
SR15 (or SA700 which both I have) in low impedance like 32ohm or 16ohm is weaker than other DAP like AP80Pro which I also have and compared.

A&K DAPs are really nice for efficient IEMs or high impedance and efficient headphones, but not for power hungry low impedance headphones (like MrSpeakers Ether).

Do you know if SR15 in unbalanced has similar output to hiby R5 Saber if using 10 ohm IEM?

 

[Licht]

Do you know if SR15 in unbalanced has similar output to hiby R5 Saber if using 10 ohm IEM?

From the spec sheet, R5 Sabre outputs 1040mW@16ohms, and around 30mW for SR15 in 16ohms, so, power wise, quite different in 16ohms.
Could be more different or less but still must be big difference in 10ohms.
However, both shall play LOUD, and sound wise, you have to audition to know if it sounds good or not.

 

[Blamelouis]

Lol..somebody who knows there stuff...makes a change.

 

[DatClampTho]

I've been using my SR15 for month now with Qobuz instead of Tidal to stream what I don't own files of. I'm back in love with the device. I'd say it's far from obsolete for me given it's small form factor and that I'm still getting 8-9 hours of listening on a charge.

I know big battery and big power has been on trend for daps, but I love being able to pocket this sweet sound.

 

[Blamelouis]

I've been using my SR15 for month now with Qobuz instead of Tidal to stream what I don't own files of. I'm back in love with the device. I'd say it's far from obsolete for me given it's small form factor and that I'm still getting 8-9 hours of listening on a charge.

I know big battery and big power has been on trend for daps, but I love being able to pocket this sweet sound.

Looks like an option

 

[JasonNYC]

New firmware is now available for the SR15 to fix the login authentication issue with the embedded Tidal app.

 

[audiogeekery]

New firmware is now available for the SR15 to fix the login authentication issue with the embedded Tidal app.

Thanks so much, Jason!
confirmed that Tidal is working!

 

[audiogeekery]

With the update to Apple Music.
Is anyone able to load this on SR15 with lossless audio working? I’m interested to see if the Android version works here and if the latest version is smooth or not.

Any help is appreciated!

 

[Blamelouis]

New firmware is now available for the SR15 to fix the login authentication issue with the embedded Tidal app.

Working a treat and sounding great ..thanks for your help.

 

[nekromantik]

@JasonNYC can ak guys see if they can add support for power amp app?