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Amazon Kindle Fire 7 2019 Heaphone out impedance? (and Music App & HP reco.)

L5730

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#1
I picked up one of these tablets a little while ago.
Haven't completely rooted it, but over on XDA forums the executable exploit is available, which gives root user access in a terminal.
After getting root access and binning (or blocking) a ton of OEM crap-ware, including the terrible Amazon launcher, replacing with LauncherHijack and Nova Launcher, it doesn't such at all.

Anyone got a clue what the headphone output impedance is on this thing? It's a cheap as f**k tablet, basically sold at a loss (you are buying an advertising platform), but I wonder how good or bad the internal DAC sounds.

I was considering some HD280 Pros, 'cause they ain't too pricey (~£85 on Sennheiser's own site) and seem reasonably well built with good isolation and reasonable sonics. I understand sound quality and leakage is dependent on the wearers head - and I may not get on with them at all. They're also apparently quite tight.
I'd prefer closed back to better isolate outside sounds, whilst I do understand that open back just sound better and let your ears breathe.
Beyerdynamic DT7700Pro 32 or 80 Ohm also seemed like a decent option for maybe a little more cost.

For now, I was thinking to just connect as is, using internal DAC/HP amp. Also use with PC (X370 motherboard / Realtek ALC1220) which has adjustable impedance, however good that is. General other use - so really low impedance/easier to drive makes more sense.
Eventually if I spend a lot of time headphone listening, I'll buy an amp like the Atom, or go the DAC/Amp route with a DX3Po or such.

I stuffed on Foobar2000 for Android, and it plays, but doesn't support HiRes at least it didn't to the Topping D10 DAC, which otherwise worked fine with an OTG-cable!
Anyone know of a music player app that is free and supports HiRes and DSD?

Cheers!
 

garbulky

Major Contributor
Joined
Feb 14, 2018
Messages
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#2
I picked up one of these tablets a little while ago.
Haven't completely rooted it, but over on XDA forums the executable exploit is available, which gives root user access in a terminal.
After getting root access and binning (or blocking) a ton of OEM crap-ware, including the terrible Amazon launcher, replacing with LauncherHijack and Nova Launcher, it doesn't such at all.

Anyone got a clue what the headphone output impedance is on this thing? It's a cheap as f**k tablet, basically sold at a loss (you are buying an advertising platform), but I wonder how good or bad the internal DAC sounds.

I was considering some HD280 Pros, 'cause they ain't too pricey (~£85 on Sennheiser's own site) and seem reasonably well built with good isolation and reasonable sonics. I understand sound quality and leakage is dependent on the wearers head - and I may not get on with them at all. They're also apparently quite tight.
I'd prefer closed back to better isolate outside sounds, whilst I do understand that open back just sound better and let your ears breathe.
Beyerdynamic DT7700Pro 32 or 80 Ohm also seemed like a decent option for maybe a little more cost.

For now, I was thinking to just connect as is, using internal DAC/HP amp. Also use with PC (X370 motherboard / Realtek ALC1220) which has adjustable impedance, however good that is. General other use - so really low impedance/easier to drive makes more sense.
Eventually if I spend a lot of time headphone listening, I'll buy an amp like the Atom, or go the DAC/Amp route with a DX3Po or such.

I stuffed on Foobar2000 for Android, and it plays, but doesn't support HiRes at least it didn't to the Topping D10 DAC, which otherwise worked fine with an OTG-cable!
Anyone know of a music player app that is free and supports HiRes and DSD?

Cheers!
I have used these quite a lot with different sennheiser headphones from a 200 series to the HD600.
At 300 ohm impedance it plays sound but not loudly at max settings. It's not really great as a headphone amp but you will hear some music.
 
OP
L5730

L5730

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Thread Starter #3
Oh, it's around the 300 ohm ballpark :s eek!

Yeah, sure, I don't expect anything amazing from the inbuilt DAC. C'mon the entire tablet cost as much as just a low-res screen for a RaspberryPi or less than a RPi 3B+. The sound output is going to be where the 1c/1p parts were used ;)
It did seem relatively quiet through the desktop speakers I have, and that was a full tilt too. Gonna be quiet.

I guess I should just buy a portable amp, maybe something like a FiiO and run that from the OTG and run headphones from the FiiO in this case.
 

Cahudson42

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#4
Oh, it's around the 300 ohm ballpark :s eek!

Yeah, sure, I don't expect anything amazing from the inbuilt DAC. C'mon the entire tablet cost as much as just a low-res screen for a RaspberryPi or less than a RPi 3B+. The sound output is going to be where the 1c/1p parts were used ;)
It did seem relatively quiet through the desktop speakers I have, and that was a full tilt too. Gonna be quiet.

I guess I should just buy a portable amp, maybe something like a FiiO and run that from the OTG and run headphones from the FiiO in this case.
My Fire 7 with OTG cable works great with a D10 and Liquid Spark. But I did need to switch to an OTG cable with power in to get the D 10 to work consistently..
 
OP
L5730

L5730

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Thread Starter #5
@Cahudson42 what music player app are you using?
The D10 seems to be fine with a cheaper sub £1 USB OTG cable I got. Because of the handy sample rate display on the D10 I can see Foobar2000 isn't playing music at it's native sample rate, but resampling to 44.1kHz instead.
 

Cahudson42

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#6
@Cahudson42 what music player app are you using?
The D10 seems to be fine with a cheaper sub £1 USB OTG cable I got. Because of the handy sample rate display on the D10 I can see Foobar2000 isn't playing music at it's native sample rate, but resampling to 44.1kHz instead.
I am using the new Amazon Music HD - the D10 showing 44.1 ((16/44.1)..
 
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