[auronthas]

With regards to Battery Life, do you guys do a full charge ? Then let it play and drain until 0%, do another full charge, repeat couple cycles? Hope this help to improve battery performance and full potential. Next is firmware update on battery depleting if there's glitch or hidden apps running in standby mode.

 

[abitdeef]

With regards to Battery Life, do you guys do a full charge ? Then let it play and drain until 0%, do another full charge, repeat couple cycles? Hope this help to improve battery performance and full potential. Next is firmware update on battery depleting if there's glitch or hidden apps running in standby mode.

Actually with this type of cell- li ion it's better if you take it down to around 15% or even 20% then recharge. There is no memory effect like ni cad. Although out of habit sometimes or to check the discharge rate I take it down lower.

But yes in a couple of cycles it should improve a bit.

 

[auronthas]

Actually with this type of cell- li ion it's better if you take it down to around 15% or even 20% then recharge. There is no memory effect like ni cad. Although out of habit sometimes or to check the discharge rate I take it down lower.

But yes in a couple of cycles it should improve a bit.

Only for first few time on new battery, thereafter, I will only recharge when battery is 20%, not to let it drop below 15%. For my WM1A, I have battery saver mode on, so it will not charge upto 100% , approx. 90% i think... this is to prolong the battery life.

 

[abitdeef]

Only for first few time on new battery, thereafter, I will only recharge when battery is 20%, not to let it drop below 15%. For my WM1A, I have battery saver mode on, so it will not charge upto 100% , approx. 90% i think... this is to prolong the battery life.

I've heard that battery saver mode has a bug and actually drains battery in the A100.

 

[auronthas]

I've heard that battery saver mode has a bug and actually drains battery in the A100.

Oh no... that's must be a glitch, no such problem in WM1A. For those who bought from Japan via ebay then need to monitor if new firmware coming out and update.

 

[abitdeef]

Oh no... that's must be a glitch, no such problem in WM1A. For those who bought from Japan via ebay then need to monitor if new firmware coming out and update.

Yes I hope it's OTA firmware upgrade.

 

[auronthas]

Yes I hope it's OTG firmware upgrade.

I presume you mean OTA, over-the-air ?

 

[fish1050]

Actually with this type of cell- li ion it's better if you take it down to around 15% or even 20% then recharge. There is no memory effect like ni cad. Although out of habit sometimes or to check the discharge rate I take it down lower.

But yes in a couple of cycles it should improve a bit.

Actually when I had a battery issue with my Sony A17 and contacted Sony about a replacement. They recommended letting the battery drain to zero periodically (every couple of months) to help keep the battery meter calibrated. Constantly charging and recharging at different levels can get the battery meter out of wack over time.

 

[auronthas]

NW-A105 unable to drive HD650 , minimum power required is 16.7mW @ 300ohm at desired listening SPL of 110dbSPL (refer table below)

Output power of NW-A105 = 35mW @16ohm single ended, voltage = sqrt of 0.035Wx16 = 0.75Vrms, (V = sqrt (power x impedance))
Power at 300ohm = V^2/Impedance = 0.56/300= 1.86mW (<16.7mW) .

My Shanling M2S output power 80mW @32ohm or 8.5mW@300ohm, able to listen to HD650 but not at its full potential at volume 88/100.

Sony NW-WM1A 250mW@16ohm or 13.33mW @300ohm balanced 4.4mm, still lower than 16.7mW but better than M2S, still need a headphone amp to shine HD650 performance.

Hope it helps...

In another words, NW-A105, its max voltage rms is 0.75Vrms,

From the above table, NW-A105 should able to drive those IEM/headphone with voltage rms less than 0.75Vrms.

For example, BGVP DM6, Vrms= 0.036 (<0.75Vrms)

 

[nanaholic]

NW-A105 unable to drive HD650 , minimum power required is 16.7mW @ 300ohm at desired listening SPL of 110dbSPL (refer table below)

Output power of NW-A105 = 35mW @16ohm single ended, voltage = sqrt of 0.035Wx16 = 0.75Vrms, (V = sqrt (power x impedance))
Power at 300ohm = V^2/Impedance = 0.56/300= 1.86mW (<16.7mW) .

My Shanling M2S output power 80mW @32ohm or 8.5mW@300ohm, able to listen to HD650 but not at its full potential at volume 88/100.

Sony NW-WM1A 250mW@16ohm or 13.33mW @300ohm balanced 4.4mm, still lower than 16.7mW but better than M2S, still need a headphone amp to shine HD650 performance.

Hope it helps...

Unfortunately it simply doesn't work like that. There's no linear relationship between output power and impedance - therefore you cannot use power output with one impedance to derive the output power with another impedance value.

 

[auronthas]

Unfortunately it simply doesn't work like that. There's no linear relationship between output power and impedance - therefore you cannot use power output with one impedance to derive the output power with another impedance value.

the output power of the table is with respect to respective impedance of headphone/IEM (eg. minimum required output power for HD650 is 16.7mW@300ohm), you need to do some conversion to match DAP declared output power and impedance if DAP can drive the heaphone/IEM (both DAP and headphone/IEM must compare output power (mW) at same impedance unit, for this case HD650 and NW-A105, i.e.300ohm or 16ohm.

Just a quick check though... nothing much about precision value

 

[psikey]

Battery test playing Tidal offline continuously is similar to Spotify and ~9%/hr so should get 10-11hrs (mix of HiFi & MQA) volume at 65-70. Couple of track skips and no screen time.

UPDATE

Just done 4hrs and used 39% battery so more like 10 hrs. Less than 1min screen time, couple of track skips & +/- volume step changes in range 61-70.

FINAL UPDATE

After 6 solid hours 42% battery remaining.

 

[nanaholic]

the output power of the table is with respect to respective impedance of headphone/IEM (eg. minimum required output power for HD650 is 16.7mW@300ohm), you need to do some conversion to match DAP declared output power and impedance if DAP can drive the heaphone/IEM (both DAP and headphone/IEM must compare output power (mW) at same impedance unit, for this case HD650 and NW-A105, i.e.300ohm or 16ohm.

Just a quick check though... nothing much about precision value

Again it doesn't work like that.

For example take the headphone power output of the Chord Hugo 2:
94mW @ 300Ω > this gives 5.31 Vrms

Now using your assumption what would the power output be at 32ohms?
5.31^2/32 = 0.881W

However the measured value given by Chord is 740mW @ 32Ω

Also what about 8ohm?
5.31^2/8 = 3.5245W

But the official measurement is 1050mW @ 8Ω

Again, there is no linear relationship between power output and load impedance (in fact the lower the impedance you see the actual value being a lot lower than the calculated value - meaning the efficiency of the output changes according to the load), so you cannot use the formulas to infer whether there is sufficient power to drive the headphones because the output at 16ohm might actually be a lot lower than when a 300ohm load is connected.

A single load/power value by itself is pretty meaningless and I wish Sony would provide more values, but when other makers *cough*AK*cough* continues to fool people with their no load condition output figures and people swallowing it up whole I doubt that it would change anytime soon.

 

[auronthas]

Again it doesn't work like that.

For example take the headphone power output of the Chord Hugo 2:
94mW @ 300Ω > this gives 5.31 Vrms

Now using your assumption what would the power output be at 32ohms?
5.31^2/32 = 0.881W

However the measured value given by Chord is 740mW @ 32Ω

Also what about 8ohm?
5.31^2/8 = 3.5245W

But the official measurement is 1050mW @ 8Ω

Again, there is no linear relationship between power output and load impedance (in fact the lower the impedance you see the actual value being a lot lower than the calculated value - meaning the efficiency of the output changes according to the load), so you cannot use the formulas to infer whether there is sufficient power to drive the headphones because the output at 16ohm might actually be a lot lower than when a 300ohm load is connected.

A single load/power value by itself is pretty meaningless and I wish Sony would provide more values, but when other makers *cough*AK*cough* continues to fool people with their no load condition output figures and people swallowing it up whole I doubt that it would change anytime soon.

Have a look at ifi micro iDSD BL various mode (eco, normal and turbo), the correlation between various power and impedance.

 

[psikey]

My portable. No need for bluetooth or remotes