A2017g dac - ZTE Axon 7 Questions & Answers

I really dont understand why my Xiaomi MI A1 sounds better than my Axon 7 when I use the AUX in my car? I really dont understand why because I have to lower my volume 3 steps back from full for the sound to be clear on my AXON 7?

mameenbh said:
I really dont understand why my Xiaomi MI A1 sounds better than my Axon 7 when I use the AUX in my car? I really dont understand why because I have to lower my volume 3 steps back from full for the sound to be clear on my AXON 7?
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You really don't understand how an AUX works?
The Axon 7 has the DACs, but it also has 10 volt amplifiers. Those are made for driving high-impedance drivers. Your aux is not a driver. hence it distorts when you input 10 volts to it

Try to minimise equalisation also. You overload the input stage of the headunit. I run a 4 channel amp in my car for the doors and a separate amp for the subs. I equalise partly on the phone and partly by the amps and none by the headunit. Can push the volume really high with clarity but I also keep the phone below maximum volume simply because it can and will overload the input. Any other of my devices will not overload it like the Axon beast.
Mostly I will use BT in the car. Less issues and I have stalk controls and inbuilt BT for the HU. I prefer to use the 3.5 jack for headphones as Choose an username suggests.
Most regular phones have a lower headphone output which is closer to line levels and presents less of an impedance mismatch issue.

Choose an username... said:
You really don't understand how an AUX works?
The Axon 7 has the DACs, but it also has 10 volt amplifiers. Those are made for driving high-impedance drivers. Your aux is not a driver. hence it distorts when you input 10 volts to it
Click to expand...
Click to collapse
The Mi A1 has a 10 volt amp too !

Try switching to the standard DAC when using car aux? It's less powerful than the 'HiFi' DAC. Alternatively Bluetooth doesn't involve the double amplification pathway that AUX in methods entail.

greyhamism said:
Try switching to the standard DAC when using car aux? It's less powerful than the 'HiFi' DAC. Alternatively Bluetooth doesn't involve the double amplification pathway that AUX in methods entail.
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Click to collapse
Bluetooth doesn't use any part of the audio D/A system (no dac, no amp) xd

I didn't say that it did, I said unlike using an aux in source it isn't :
-amplified by your phone's amp
-amplified again by your head units amp.
Using Bluetooth moves the D->A conversion from the phone to the head unit, after which the signal only needs to be amplified once, which depending on the source can result in a cleaner sound

Related

Android 5.1 head unit >>> USB Audio (DAC) output

Hi, I installed a MTCD Android head unit with Android 5.1.1 in my car two weeks ago. (I could'nt start this thread in the MTCD section because I'm new here)
My car audio setup goes as follow: Android Head Unit >>> USB Cable >>> PCM2704 USB to SPDIF adapter >>> SPDIF coax cable >>> MiniDSP 6x8 >>> 3 Amps >>> Speakers + sub.
So far I've been able to get SPDIF sound output with Neutron (Direct USB mode), Onkyo HF Player, USB Audio Player Pro, HibyMusic Player.
Sound is amazing btw.
If I understand correctly, all these apps are working with the USB DAC because they use their own app's USB Driver.
Important to know: All song in 44khz are playing fine, songs in 48khz makes every app freeze. I got a way around this by setting Neutron to resample every song in 44khz, so all songs are working now.
Now, if I play a song in Google Play Music, Spotify, Kodi, etc no sound comes out ... same thing for my HU video app, phone calls etc.
Is there a way around this ? What modifications can be made so every sound outputs to the USB Audio ? IE. kernel update, system files modifications etc ??
Thanks for any input.
Nobody use a USB DAC with his head unit ?
I have found this thread: http://forum.xda-developers.com/showpost.php?p=66707293&postcount=47
But I dont think it applies to Android 5.1, sound management is different.
i dont use any DAC on this head unit. But I do have a Dragonfly USB DAC on my computer. the Dragonfly Red says it works with Android. Not sure if that is just marketing, or if it doesn't something specific.
CadillacMike said:
i dont use any DAC on this head unit. But I do have a Dragonfly USB DAC on my computer. the Dragonfly Red says it works with Android. Not sure if that is just marketing, or if it doesn't something specific.
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Click to collapse
Can you try it please ?
DanB0y said:
Can you try it please ?
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Click to collapse
i dont know how I would even go about hooking it up? i could plug it into the USB port, but then what? use headphones?
all my speakers go through the wiring harness
CadillacMike said:
i dont know how I would even go about hooking it up? i could plug it into the USB port, but then what? use headphones?
all my speakers go through the wiring harness
Click to expand...
Click to collapse
you would need to be using pre-outs, using a 3.5mm to rca cable into an external amp.
---------- Post added at 09:03 AM ---------- Previous post was at 08:57 AM ----------
interesting that you've tried this. This forces you to completely by-pass the HUs sound processing.
I have the same DSP, but I'm using direct pre-outs. I like this idea though bc it gets around the low pre-out voltage, and allows you to ignore the poorly implemented sound processing in the HU.
Unfortunately, you probably need to modify the filesystem to get this to work, as your link shows. Why do you feel the need to use a DAC in addition to the DSP?
Hisma said:
you would need to be using pre-outs, using a 3.5mm to rca cable into an external amp.
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Click to collapse
my sub is tapped into my speaker wires, so I dont use the RCA preouts. So I probably can't try this.
However, I think my audio is pretty great with the Joying
CadillacMike said:
i dont know how I would even go about hooking it up? i could plug it into the USB port, but then what? use headphones?
all my speakers go through the wiring harness
Click to expand...
Click to collapse
Yes simply use headphones
We just need to know if audio is outputing from the DAC.
I would appreciate, thanks !
Hisma said:
Unfortunately, you probably need to modify the filesystem to get this to work, as your link shows. Why do you feel the need to use a DAC in addition to the DSP?
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Click to collapse
The DAC is a really clean source signal VS the head unit, I have a 2000$+ sound system in my car and sound quality is very important to me.
Also, DAC is digital signal VS analog RCA outputs on the head unit.
DanB0y said:
The DAC is a really clean source signal VS the head unit, I have a 2000$+ sound system in my car and sound quality is very important to me.
Also, DAC is digital signal VS analog RCA outputs on the head unit.
Click to expand...
Click to collapse
I agree. I feel like right now my HU is the "weak point" of my system. I am about the same as you, roughly $2000 in equipment (probably a little more).
focal KRX3 3-way active system w/ a cheap kicker sub + 3 amps. I have the C-DSP along w/ a line driver to manage the low pre-out voltage. Would love to take the line driver out of the signal chain if I could. All these components are taking up a lot of valuable space.
I hope you figure this out. I don't have a MTCD, I have a non-joying 4.4 HU. Would love to use the SPDIF inputs on the C-DSP as opposed to the ****ty pre-outs from the HU.
Hisma said:
I agree. I feel like right now my HU is the "weak point" of my system. I am about the same as you, roughly $2000 in equipment (probably a little more).
focal KRX3 3-way active system w/ a cheap kicker sub + 3 amps. I have the C-DSP along w/ a line driver to manage the low pre-out voltage. Would love to take the line driver out of the signal chain if I could. All these components are taking up a lot of valuable space.
I hope you figure this out. I don't have a MTCD, I have a non-joying 4.4 HU. Would love to use the SPDIF inputs on the C-DSP as opposed to the ****ty pre-outs from the HU.
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Click to collapse
Nice ! I have 3 way peerless (tweets + 3.5 mids + 7in woofer) 1 pioneer amp 4ch for tweets + mids and 1 pioneer amp 2ch for the woofers, another JBL amp in the trunk with a 15in Alpine Type-R. I have the C-DSP 6X8 MiniDSp as well
SPDIF to C-DSP SPDIF Input would give you 4V at the MiniDSP RCA outputs
DanB0y said:
SPDIF to C-DSP SPDIF Input would give you 4V at the MiniDSP RCA outputs
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Click to collapse
well you have convinced me to give this a shot. The USB DAC + 25 ft coax cable only set me back $35 on amazon. So even if this doesn't work I won't be mad.
The potential for 4V of CLEAN pre-out voltage is too enticing to pass up. The line driver works, but like I said it's another box that needs power/space/etc. The USB DAC also allows me to take the HU sound processor fully out of my signal chain.
I am unfortunately using android 4.4, so dont think I can help you much, but I will let you know if this works nonetheless.
Hisma said:
well you have convinced me to give this a shot. The USB DAC + 25 ft coax cable only set me back $35 on amazon. So even if this doesn't work I won't be mad.
The potential for 4V of CLEAN pre-out voltage is too enticing to pass up. The line driver works, but like I said it's another box that needs power/space/etc. The USB DAC also allows me to take the HU sound processor fully out of my signal chain.
I am unfortunately using android 4.4, so dont think I can help you much, but I will let you know if this works nonetheless.
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Click to collapse
If it dont work natively, I'm 99% sure it will work with the Neutron music player. Install it and then go to hardware settings and enable Direct USB Driver. :good:
DanB0y said:
If it dont work natively, I'm 99% sure it will work with the Neutron music player. Install it and then go to hardware settings and enable Direct USB Driver. :good:
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Click to collapse
well I tested this today and I am very pleased with the results. I really do notice a difference in SQ. It sounds "cleaner" and fuller.
Only major thing I notice is the overall volume seems really high over SPDIF. Only place I can adjust the volume now is with the DSP, but even then, I find I need to turn the gain down on the SPDIF inputs to get an acceptable volume. This is even with gain all the way down on my amps. This leads to a bit of clipping on the highs.
Did you make any adjustments in neutron player or the DSP to get an acceptable volume? Or do you get by with just adjusting the DSP master volume?
Now I just need to see if I can get all my sound to route through. I like to listen to streaming music too but I don't think I can go back to using analog pre-outs.
Hisma said:
well I tested this today and I am very pleased with the results. I really do notice a difference in SQ. It sounds "cleaner" and fuller.
Only major thing I notice is the overall volume seems really high over SPDIF. Only place I can adjust the volume now is with the DSP, but even then, I find I need to turn the gain down on the SPDIF inputs to get an acceptable volume. This is even with gain all the way down on my amps. This leads to a bit of clipping on the highs.
Did you make any adjustments in neutron player or the DSP to get an acceptable volume? Or do you get by with just adjusting the DSP master volume?
Now I just need to see if I can get all my sound to route through. I like to listen to streaming music too but I don't think I can go back to using analog pre-outs.
Click to expand...
Click to collapse
Great ! Now you're in the same boat as me lol
(Except for the clipping, I have no problem with that)
What is the model of your amps ? I have my gain to around 1/3 in the amps (They're up to 6.5V input sensitivity) and spdif input gain is at 0.
For your sound routing, you can sum the rca inputs and the spdif input together in the DSP And then you use your input levels to match the loudness. That way, you'll be able to listen excellent SQ music from Neutron and still hear BT phone calls, Youtube, navigation etc trough the analog inputs.
DanB0y said:
Great ! Now you're in the same boat as me lol
(Except for the clipping, I have no problem with that)
What is the model of your amps ? I have my gain to around 1/3 in the amps (They're up to 6.5V input sensitivity) and spdif input gain is at 0.
For your sound routing, you can sum the rca inputs and the spdif input together in the DSP And then you use your input levels to match the loudness. That way, you'll be able to listen excellent SQ music from Neutron and still hear BT phone calls, Youtube, navigation etc trough the analog inputs.
Click to expand...
Click to collapse
Yes! This is exactly what I have done. I spoke too soon also. The clipping was more a tuning issue than anything (changed cross-over on tweeters & lowered their output a bit). I was able to set the gain on SPDIF back to 0.
Man it sounds really good now. I haven't any real tuning yet outside of setting gains and cross-overs. I think once I tune the system it'll take it over the top.
I have a mosconi as100.4 on the tweeters and mids, and a alpine mrv-m500 on the sub. (i have one other amp I am replacing to power mid woofer, should arrive tomorrow). It's a total overkill system, but I find great deals on used gear on diymobileaudio classifieds so I keep upgrading lol.
So now I will use neutron for majority of listening, and by mixing channels together on the analogs I already had connected, I get acceptable SQ for phone calls and streaming music. I have no desire to mod my system files the way it was shown in that thread you linked. Looks too risky. I am okay with this new arrangement since 90+% of my listening is my personal music collection.
Really appreciate you making this thread. I always knew my system was capable of sounding better and this did the trick. I will let you know if I figure anything else out that could be useful.
Hisma said:
Yes! This is exactly what I have done. I spoke too soon also. The clipping was more a tuning issue than anything (changed cross-over on tweeters & lowered their output a bit). I was able to set the gain on SPDIF back to 0.
Man it sounds really good now. I haven't any real tuning yet outside of setting gains and cross-overs. I think once I tune the system it'll take it over the top.
I have a mosconi as100.4 on the tweeters and mids, and a alpine mrv-m500 on the sub. (i have one other amp I am replacing to power mid woofer, should arrive tomorrow). It's a total overkill system, but I find great deals on used gear on diymobileaudio classifieds so I keep upgrading lol.
So now I will use neutron for majority of listening, and by mixing channels together on the analogs I already had connected, I get acceptable SQ for phone calls and streaming music. I have no desire to mod my system files the way it was shown in that thread you linked. Looks too risky. I am okay with this new arrangement since 90+% of my listening is my personal music collection.
Really appreciate you making this thread. I always knew my system was capable of sounding better and this did the trick. I will let you know if I figure anything else out that could be useful.
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Click to collapse
Yeah I know what overkill sounds like haha
For frontstage 3way I got a 4ch Pioneer Premier PRS-X340 running 2x NE25-VTS04 Peerless tweets and 2x NE95W-04 3in Peerless mids, another Pioneer old scholl amp pushing 2x175w for 7in Wavecor woofers. In the trunk is a JBL GTO14001, 1500Wrms @2ohm pushing a 15In Alpine Type-R sub in 3.5cuft tuned @21hz
All my amps are very good condition used gear found on classifieds too, you can dig some real treasors for very little money sometimes !
I've been looking all around the web since last week for how to route every sounds of the HU to a USB DAC, translating and reading about 500 pages worth of XDA/Russian Android forums, spent last nights editing config files all around my HU System folder, I tried the how-to link I posted in OP for MTCB units, nothing to do.. I really think the Kernel must be enabled for USB Audio for it to work, my DAC shows up in USB devices info but not in the audio output devices.
Well, I'm still happy because my FLAC music collection plays incredibly well i dont car that much for FM Radio SQ, I only wish I'd be able to listen to Spotify or Kodi on the DAC.
Im r eally glad if I could be any help to you and will keep this thread updated if I find something !
navigation guidance voice goes through usb audio ?
DanB0y said:
Yeah I know what overkill sounds like haha
For frontstage 3way I got a 4ch Pioneer Premier PRS-X340 running 2x NE25-VTS04 Peerless tweets and 2x NE95W-04 3in Peerless mids, another Pioneer old scholl amp pushing 2x175w for 7in Wavecor woofers. In the trunk is a JBL GTO14001, 1500Wrms @2ohm pushing a 15In Alpine Type-R sub in 3.5cuft tuned @21hz
All my amps are very good condition used gear found on classifieds too, you can dig some real treasors for very little money sometimes !
I've been looking all around the web since last week for how to route every sounds of the HU to a USB DAC, translating and reading about 500 pages worth of XDA/Russian Android forums, spent last nights editing config files all around my HU System folder, I tried the how-to link I posted in OP for MTCB units, nothing to do.. I really think the Kernel must be enabled for USB Audio for it to work, my DAC shows up in USB devices info but not in the audio output devices.
Well, I'm still happy because my FLAC music collection plays incredibly well i dont car that much for FM Radio SQ, I only wish I'd be able to listen to Spotify or Kodi on the DAC.
Im r eally glad if I could be any help to you and will keep this thread updated if I find something !
Click to expand...
Click to collapse
Any update on this thread ?
I made some sort of experiance, on Joying HU , the 2GB Rockchip Sofia version (10.1" screen) :
Using info from https: // source.android.com/devices/audio/usb.html - i looked into the "audio_policy.conf" file on the Joying, and for sure , there was no reference to any USB audio interface.
I am no android expert .. but i edited this file , with the info gathered from the link above , and after a reboot - the HU did indeed send the audio to the USB port.
Audio from all the apps i tred , was routed to the USB interface (Radio , DAB player,Kodi etc..)
The bad thing (?) - there was no volume control , all audio is at max level.
An external volume control could possibly remedy this.. i will look into it
Frank

Poor music quality using USB-C to USB connector in audi a4 2017...overloaded sound

Hi all-
I'm using this usb type C to usb connector inside my audi for playing music off of the Nexus 6p through the car's Android Auto:
https://www.amazon.com/gp/product/B010VFFSL4/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
I specifically got this one since it meets USB-C spec as many cables out there that boast high transfer rates can ruin your equipment. I'm using the latest WETA ROM and have tried a myriad of combinations by turning off/on Viper mod, configuring its settings, also tuning the eq in my car, etc.
What's weird is that music over bluetooth sounds like much better quality than wired with this USB type C connection. I got an awesome aftermarket sub and amp installed in the car but it seems to bring out the deeper issue. It's when music (mainly rock) has all instrumentals blending that the sound becomes distorted and overloaded. Because our phones already have poor max volume output, I'm having to max out the volume in the car. Also with android auto, you can't use the volume rockers on the phone it seems...seems to override the sound volume.
Anyone have any idea? In this car I can't seem to play music with aux cable (maybe an iPhone would work) and USB stick doesn't mount songs. Don't know if it's the cable I bought, the ROM (has the A.R.I.S.E. mod built in), or the DAC in the AUDI?
Thanks

Dimmable buttons and better sound quality

Hello. Im owner of PX5 Android 9 Head Unit for BMW E46. I know hot to change buttons color but i don't know how to make it dimmable. They always have 100% brightness and it is annoying. Should i change something in radio settings or with the cable connection? 17pins BMW E46 sedan 2003 by.
Other question is - are there available mods or DSP settings for best sound quality? In my opinion this HU sound very raw even with enabled Loud. Previously BMW Business CD53 HU had very soft and warm sound quality. I would like to achieve this on this HU too.
Bump
The lighting wire (orange) from the radio needs to be connected to the wire in the car's harness that does the dashboard lighting. If your radio gets that signal through a CANbus decoder you will have to cut the wire and connect it directly to the car harness.
nic2k said:
The lighting wire (orange) from the radio needs to be connected to the wire in the car's harness that does the dashboard lighting. If your radio gets that signal through a CANbus decoder you will have to cut the wire and connect it directly to the car harness.
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Click to collapse
thanks i will try that.
And any advices for better sound quality? My previously CD 53 had better sound quality (more soft and warm) than this TDA 7851 based device.
The way you hear sound is personal. Your factory HU would have been tuned and equalized to sound that way so you'll have to play with the equalizer to replicate it. The DSP in those units is missing preset effects like you would find on a home theater receiver. You should probably start by making sure the speaker settings match what's in the car like distance and # of ways. If you find the sound too harsh look at lowering the low pass filter frequency and try a different type of filter. You can adjust the PHAT slider to give the sound more volume. Too bad there isn't an easy way to control reverb directly. Then adjust the equalizer to your taste.
nic2k said:
You should probably start by making sure the speaker settings match what's in the car like distance and # of ways.
Click to expand...
Click to collapse
Different radio (original BMW) sound warm and soft. This, even with playing on different EQ settings and DSP cant achieve this warm quality. Im using car amp and hertz DCX 165.3 on rear, Audio system MX165 PLUS on front. Everything is connected to amp via Hi_Lo converter. Should i connect this HU with RCA cable? Does this affect on sound quality?
Also are available somewhere custom setting presets for EQ and DSP?
Oh no wonder you're getting a different sound than the factory radio you're using a line level converter. Some people swear they don't change the sound and some other have better hearing and swear they hear a difference. Either way there's no denying basic electronic principles if you drive a signal through coils it will affect the signal more than just reducing the amplitude. It will definitely add/change harmonics and it might not respond evenly at all frequencies. Something like that is probably acceptable to drive a subwoofer. It would take some finely tuned filtering of the output to get the same signal that went in.
If you're using an external amp you should connect it to the RCA's. The problem with these Chinese HU is the line out level is too low they're still living in the 80's when a 1 V line level was standard. Some amps have an adjustable line in maybe find one that works with 1 V.
It might not matter as much but you replaced the factory speakers, all speakers sound different. Usually aftermarket speakers have better quality and sound than factory.
nic2k said:
It might not matter as much but you replaced the factory speakers, all speakers sound different. Usually aftermarket speakers have better quality and sound than factory.
Click to expand...
Click to collapse
yes i know, but my external amp and new speakers were installed also on previously radio.
i will try connecting this HU with RCA cable

HU uses aux port

Hi guys, I am looking to put an android head unit into my BMW X1 (e84) and would like some thoughts/advice on the audio side of things.
TLDR; The unit requires the use of the aux port, which is low powered and too quiet - what are my alternatives?
Best I can tell all the android units for the e84 are essentially an extra side unit, as the original OEM HU stays in the car, take the following for example: AVIN BAVE84-1025 (I can't post the link as I don't have enough posts).
My only problem is the audio from the android needs to be looped through the cars aux port, which just seems wrong, as the aux port is low powered I'll never be able to get loud good quality audio through to the car speakers?
As it is at the moment, when I plug my android phone into my aux port, I turn the cars volume to maximum (including the extra aux volume) and it's still incredibly quiet. Is this because it's low powered aux, or is it my phone causing the quietness? (My phone is also turned up to max volume)
I'm worried that if I purchase one of these android units and utilise the aux port for the audio, I'll have the same volume/quality problem that I have when using my phone.
I used to have a 1 series (e87), where the android unit just hooked straight into the cars audio system, no need for utilising aux.
I have read that some people have left the aux unplugged in an F48 and the audio still worked (I'll see if I can find the thread for that) but obviously that's a newer model, so I'm not sure what's different.
I've also read a little about using a USB DAC, but I don't fully understand the process. Am I right in thinking the android device would need to be told to output audio to the USB, and the USB would then be hooked into the cars RCA audio?
At that point it's just another tablet, but with worse specs
See if connecting via bluetooth instead won't help. And try another device, maybe your phone is just being weird.
Aadieu said:
At that point it's just another tablet, but with worse specs
See if connecting via bluetooth instead won't help. And try another device, maybe your phone is just being weird.
Click to expand...
Click to collapse
I'm still running the OEM head unit at the moment (professional head unit) but it doesn't have music over Bluetooth.
I'll try another device to see if it'll go louder, but as far as I'm aware the aux port is generally quiet anyway because its low powered.
I have a small amp that I thought could probably help but I wouldnt want to put too much power through the aux port in case it blows.
I thought if I could get the android unit to use a USB DAC, I could then hook into the cars standard audio rather than a low powered aux. I'm just not sure whether it's possible to have these android units output to a USB instead. Does anyone have any experience with this?

Andoird head unit subwoofer problem

Hi. I bought an android head unit for my megane 2.2. All the sound is good except that my subwoofer doesnt sound like with my old Alpine player. I recently bought a bigger and better subwoofer, but its still doesnt sound like it should. I tried connecting to audio R and L and it gave a little more loud bangs, but more disortion. I have 1 subwoofer rca cable, bought a Y cable for it to make that double channel but its still the same disappointing result. Can I somehow make that work like it should or cant help that with these android head units. I want to mention that i dont have a subwoofer setting on the unit.
Link : https://www.aliexpress.com/item/100...0d5-7736-4cad-8f17-e97911a2fefc-1&pdp_ext_f={"sku_id"%3A"12000029501992407"%7D&pdp_npi=3%40dis%21USD%21159.26%21100.33%21%21%21%21%21%40210212c016773242106348294d0724%2112000029501992407%21sea%21RO%21926091275&curPageLogUid=NBigXtaxpApf
Hi!
If you bought this device in the link then Android DSP equalizer and output chip is to low to transfer bigger wattage to speakers.
One way to fix that is to buy external DSP output with more wattage then default android unit and connect amplifiers to this one, then reroute unit to use this external output.
If you have external subwoofer with amplifier try to decrease output to this amplifier in extra settings or factory menu (pin code) / sound. Output will usually be marked as speakers.

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