yashsingh1/xdaforums huggingface dataset:
[MTCD Android Head Units General] skezza:
I'm not going to jump on either of those two guys. I prefer to debunk their bull**** claims that this thing is going to sound like a Bang and Olufsen rather than go at them for any nefarious links they have to AAS.

However, one thing I will say, AndroidAutoShop claim to be the only seller of DSP units in the world..... demonstrably wrong:

http://xtrons.co.uk/dta707pl-7-hd-d...d-core-16gb-2gb-ddr3-ram-hdmi-car-stereo.html

https://www.eonon.com/Android-Car-G...h-fully-digital-processing-chip-from-ADI.html

http://joyingaudio.blogspot.com/2017/08/joying-new-developed-dsp-built-in-head.html

Xtrons also claim to ship from the UK warehouse:

http://xtrons.co.uk/shipping.html

However, I would contact them to double check first. Last thing you want is to get stung.

There seems to be a lot of misinformation flying around. Not only are the supposed unproven benefits greatly exaggerated by certain people without any kind of evidence, we now have this weird backlog of orders that aren't being fulfilled.

Something is very ****ed up about this. I really hope it gets resolved.

---------- Post added at 01:52 PM ---------- Previous post was at 01:48 PM ----------

Don't drink the marketing cool aid then. Most PX5's (but check anyway), contain the now well respected TDA7851. It's a really good amp chip, honestly. Sound quality is excellent. It has a 'DSP-lite' if you will (basically an in-built DSP as opposed to a dedicated one). You'll be over the moon. Too much **** is being thrown around about DSP's at the moment.
[MTCD Android Head Units General] Jkteam:
It says on their Webiste that is ships from HK so I don't know where to problem is.

Personally I asked to put a low value on the box

I don't know where to problem is

---------- Post added at 01:57 PM ---------- Previous post was at 01:55 PM ----------

ANdroid auto shop and graviton is the same.

call them I speak to them if you want. that's what I did. nothing dishonnest
[MTCD Android Head Units General] skezza:
Two things.... and before you jump on me for morality, I've done it myself many times:

A. That's technically tax evasion and in some parts of the world would be considered flat out fraud. Some people don't like to commit fraud. Some people think fraud is wrong. I personally don't care about people blagging import tax, especially as VAT in the UK is through the roof, but I'm not representative of everyone purchasing one of these head units.

B. You are aware that in the unlikely event that your head unit is lost, stolen, or damaged, and the postage company call on the insurance to handle the claim, you'll be given something to the amount of the value on the package. Enjoy the 16 Canadian dollars or whatever.

Shipping from a local warehouse is desirable for all involved :)

---------- Post added at 02:01 PM ---------- Previous post was at 01:58 PM ----------

Alright buddy, the lady doth protest too much?

I think what is being suggested is that it's a conflict of interest that there are members with potential links to the company coming on here with false claims of 'huge improvements'. Let me guess, are you another one? "This thing sounds better than my bro's Audi RS3 fitted with a B&O sound system with 18 component speakers".

Yeah okay bud. We need to cut through the bull**** and get proper facts on this.
[MTCD Android Head Units General] Jkteam:
FOr the first part you are right.

I taking it in the way that I still paid my dues but at the good rate not the one that the gouvernement what to take from us:)

as for the second part, I just said that graviton and androidautoshop is the same. I did research because before buying i had doughts from the androidautoshop.com site

as for members I don't know

Mine sounds very good but can't compare to a non dedicated dsp, just to my parrot asteroid smart
[MTCD Android Head Units General] skezza:
My point is, if Graviton has links to AndroidAutoShop, that's fine. If Graviton has people coming on here to boost the popularity of their products, that may not be fine. That could be seen as questionable.
[MTCD Android Head Units General] TBM2:
Yup. That was one of the reasons for my post.

btw Until proven otherwise member StableGenius can be added to the list as well.
[MTCD Android Head Units General] skezza:
The last thing I want to do is make it about targeting individuals, although if your suspicions are true then that for me is a fairly large nail into the coffin.

As much as I have questioned the claimed benefits of DSP equipped units, I am always happy to be proven wrong. I've said all along, I believe in demonstrable facts as opposed to 'feels'. If someone can prove to me that my audio experience would have benefited from a PX5 unit with a dedicated DSP, then I'll take it all back.

The problem is, as I mentioned earlier, I worked as a Software Engineer for a number of years at an audio chipset manufacturer. They designed and manufactured the chipsets for brands like Samsung, Apple, Huawei and a number of others. Although there will be people out there who know more than me about in-vehicle sound signal chains, I do know the score, and I know exactly what a DSP is and exactly what it'll contribute to the signal chain..... In the grand scheme of things, it's not a lot, unless paired with an improved amplifier chip.

I was also lucky enough to spend a short time as a software consultant at another audio company, one that develops high end speakers. They showed me how they tested their speakers acoustically and it was an incredible sight. The thing I learned while working for these two companies, is that there are a tonne of variables when achieving good to perfect sound quality. The acoustics of a concert hall, car cabin, house, bedroom, backyard..... they're all different. That is why a Barry Boy with a £100 gift voucher for Halfords can take a fairly decent sounding Volkswagen Golf and make it sound like an utter turd. Vehicle manufacturers do spend a bit of time optimising their vehicles to sound good, and especially newer cars and premium vehicles.

There are so many variables involved here, and a DSP is just one. What's more, in the grand scheme of things.... it's a small one. If you said to me:

"what's more important, a big DSP dong, or a better but uber boring amp chip", I would jump at the uber boring but better amp chip. The amp chip is what replicates the signal chain. If that sucks, the sound sucks. Simple. That is why Viper4Android can make a bad Joying unit sound better, but they still sound like ****.

These DSP units seem to be an enigma. There's no detail on what amp chip they're using. There's limited customer reviews. There's people complaining about quality control. Yet, there's people going on about DSP dongs and how important it all is without really understanding what the **** a DSP even is. It's all a bit pathetic really.

Hopefully, like I've said, it'll get resolved and these DSP units will become a potential option for enthusiasts.
[MTCD Android Head Units General] dicabkl:
So, its being shipped.

It's a PX5 unit with DSP, just tell me what tests you want for it. I'll do video, audio, whatever it takes.

By the way, never affiliated to any shop, just wanted to find some answers.

PS: shipped from HK, not from UK as stated on their site. Hope there is no extra tax.
[MTCD Android Head Units General] skezza:
Good news. Glad to hear the backlog is being resolved. Going to be tough to think of a set of tests I guess. What we need, is a non-DSP PX5 unit in the same car as yours and we then need a side by side comparison :)
[MTCD Android Head Units General] Jkteam:
After 2 days of usage so far so good !

if everything goes well and works well i will finish the install with nice finish over the weekend. now it's on my passanger seat :)
[MTCD Android Head Units General] chriscole:
So a quick update to confirm that despite the £25.00 additional import fee (which AndroidAutoShop have said they'll refund but am still waiting on that) I did receive my head unit this afternoon, and it appears to work fine. Sounds better than the stock head unit (which you'd hope, given that it's replacing a 10 year old Mercedes Audio 20).

Here's a photo of the DSP board (KJD-DSP1401-V1 2018.4.11). Looks to consist of three ICs:

* A ADAUI1701 DSP (http://www.analog.com/en/products/audio-video/audio-codecs/adau1701.html)

* A TI CD4052BM (Input switching?)

* ES7144LV DAC

I'm afraid I don't really want to disassemble the whole unit to confirm the Amp chip in use (I took the cover off, but alas the printed info is on side facing the case) but if there's a way to confirm that via software then would be happy to do so (guess it'll be the TDA7851?).

Hope that helps, happy to answer any questions and/or provide more photos if anyone would find them useful.

Chris.
[MTCD Android Head Units General] Presterin:
That DSP has some very promising reviews. I'm really considering replacing my T8 unit with one of these. Do you have any more pictures? Wiring harness for example.
[MTCD Android Head Units General] Jkteam:
It's the same harness as on the te706pl.

Then depending on your car you might need some wires some not
[MTCD Android Head Units General] ezmendriz:
Does someone know is this units play well with Androidauto?
[MTCD Android Head Units General] Jkteam:
Androidauto on the unit or androidauto on your phone connected to the unit?
[MTCD Android Head Units General] ezmendriz:
AndroidAuto on your phone connected to the unit.

The other one would defeat the purpose of this units. no?

Also, does this unit allows to connected to the internet through USB?
[MTCD Android Head Units General] wboops:
Hi guys can any one give me an update on how your new dsp android car stereo are working please
[MTCD Android Head Units General] chriscole:
Hi,

So broadly works fine, with a few small bugs that seem common to other similar headunits.

The DSP element does function and allows quite granular customisation of the audio.

The main audio issue I've noticed is a constant low level white noise whenever the unit is unmuted. In most circumstances you won't notice it (volume of the noise is low and constant regardless what volume you have playback set at) but nonetheless is annoying and marrs what otherwise seems good audio quality.

I feel like this should be solvable in MCU software (Set MUTE high on the amp unless there's audio playing?) but don't hold out much hope.

The main software issues that I've noticed so far have been audio clipping in HERE maps and display glitches in TomTom Go 3D view - both of which are frustrating but seem to be common across other Oreo PX5 units.

Hope that helps.
[MTCD Android Head Units General] wboops:
Wow thanks for your update I think I will keep my money in the bank. I had one of these radio I purchased from aliexpress but had to return to China because of sub issues and the radio did not sound that good
[MTCD Android Head Units General] skezza:
Sounds normal that does.
[MTCD Android Head Units General] dicabkl:
DSP arrived and installed

So, big wait`s over, the unit has arrived on 4th of July. Directly from HK, I paid extra taxes, around 25 uSD+DHL commission, another 20 usd.

Installed it, I had the inspiration to go for an 6 m long by-pass cable and everything worked flawlessly. I had an OE amplifier, I`ve done the connection in the boot. The CANBUS decoder also there, the connection with reverse drive camera, only one thick harness of cables got it`s way in front of the car.

I used the central console, I`ve inserted the cable on the driver side under console and I end up with almost 2 m of extra cable left under the front side of passenger.

I have connected only USB cables, antenna (by the way, my car does not have a connection of this in front, so I have to adapt one) and the big cable of 20 pins.

Everything worked from the first time, steering wheel commands and reverse camera, internet connected by WIFI, Bluetooth, exactly as described. Sound quality is very good, really can`t tell the difference between original and this unit. The unit is very responsive, I`m happy with that.

CONS:

There is no perfect Chinese unit (yet?), take care about this:

- radio reception - pretty poor. I had some other Chinese units, the same with all. I saw that there is an Radio Ant amplifier, but I didn't get one.

- gps reception - good, but far from original. Often I get the message - "GPS signal not accurate" - maybe bad connection (I guess not)

- the screen is reflective. It has a very good picture at good angles, but from my seat (driver), it`s at least not good. Acceptable anyway.

- in my case, after some "try but not fitted", I realized that I have to modify the original support of my car. Not too much, but enough to give you headache if you don`t do it. Nobody told me about this.

It took me around 5 hours to do it, but now I can give you some help if you need it :)
[MTCD Android Head Units General] Chrisstian:
So ordered myself one of their units.

XV8 - 7, or modified Xtrons TE706PL, aka Universal 7" 2DIN model.

My experience with them is mixed.

I'm based in Europe, so i have ordered with EU Tax Free option for additinal €30.

After i have made my order i had to wait around 10 days for unit to be shipped (despite they have on their page stated - shipping after completed payment in 2-3 days).

I'm guessing that's because they had to order it directly from the manufacturer (they don't have them in stock).

After the unit was shipped (DHL) it came in my country in just a few days from Hong Kong.

And there comes the problems. It was stopped by customs for processing (i had to provide to DHL invoice so they could calculate customs and VAT). After being held there for a week i finally got the unit delivered - but with additional €110 to pay!!! €23.34 for Customs, €68.84 for VAT and €15 for processing fees. I'm pissed as hell! I gave additional 1/3 of the unit price, despite i have paid in the first place €30 for EU Tax Free shipping!

And adding to that the unit didn't came at all with promised features - prerooted, viper4android and with MOD settings. It was just stock firmware (Xtrons a like) with DSP chip added.

I was promised that there would be some kind of firmware update next week with those enabled...
[MTCD Android Head Units General] Jkteam:
I am almost done with the install.

For me the radio reception is perfect.

I did some turnaround for my car and it's better actually than the parrot. for me the power antena for example goes with the switched power.

gps if precise i used tried with the preloded app, google map. didn't try waze yet

tpms monitor system seems to work

putting the radio in the hole was a pita since the radio is so huge and lot of harness and adapter behind so didn't have a lot of space to play with
[MTCD Android Head Units General] Jkteam:
here are some pics
[MTCD Android Head Units General] Chrisstian:
@Jkteam

Did your unit came with prerooted firmware?
[MTCD Android Head Units General] Jkteam:
Good question.

Didn't even check to be honest I didn't bought if for the root .

Just sent and email to androidauto shop to ask them how to know.

The amp options are more advanced than the screenshots that people shared on the Xtrons te706pl xda forum.

They told be there should be an update soon
[MTCD Android Head Units General] Chrisstian:
Regarding the root, you can check it simply by installing root checker from Play Store.

Yeah, sound options are way more advanced than the stock TE706PL without the DSP chip.

One more question for you. Do you have maybe subwoofer in your car? If so, is it working for you?

I have connected mine to SUB out port on headunit and i dont get any output from it.

Previously it was functioning with stock headunit.

And i dont have any kind of external amplifier (or optical cables as in some cars). in my car, all speakers are amplified over headunit.
[MTCD Android Head Units General] wboops:
Hi that was the problem I have with my DSP head unit no song from sub. And sound quality was not as good a none dsp head unit. This has made my mind up not to get a dsp head unit. I will weight for a bit.
[MTCD Android Head Units General] skezza:
How much did you experiment with the audio?
[MTCD Android Head Units General] wboops:
Hi I did hook up the sub on each Chanel adjust settings to full. no sounds from sub I did a full factory reset still did not get no sound
[MTCD Android Head Units General] skezza:
What about the sound quality through normal speakers?
[MTCD Android Head Units General] wboops:
Sound quality on normal speakers was not that good for one reason or another. I had an XTRONS android 8.0 which went faulty that sound better. Probley my dsp radio was faulty that is why it did not work. I really wanted one one of these radio. I will keep looking to see when the manufacturer make improvements on those radio
[MTCD Android Head Units General] skezza:
What happened to your Xtrons? Out of curiosity....
[MTCD Android Head Units General] wboops:
The xtrons had a bluetooth problem and was return to the seller for a refund. And the dsp radio was return to China for a refund
[MTCD Android Head Units General] skezza:
You have had serious bad luck so far.

Hopefully you find the right unit for you.
[MTCD Android Head Units General] wboops:
Hi do you have a unit and is it all working
[MTCD Android Head Units General] wboops:
Hi from the time I connect my dsp unit I could tell it was not tight

---------- Post added at 11:46 PM ---------- Previous post was at 11:35 PM ----------

Hi true I have a kenwood DNN9150DAB not the greatest. The reason I purchased a chines radio is the apps than can be install and hoping the sound quality it ok. And a good boom from sub
[MTCD Android Head Units General] ezmendriz:
So, What is the veredict?

Does the sound quality is enough justification to buy this units over the other similar units?
[MTCD Android Head Units General] wboops:
Hi sorry my unit was a similar unit I purchased direct from china. I am thinking of buying another unit but past experience was not that good
[MTCD Android Head Units General] Jkteam:
I have to check

I bought a scooter last summer to use it in Montreal during the summer (because of traffic and parking) so I am not using my car a lot. It's one of the reason why I did install the radio now. Since I don't use the car often I had plenty time to install the radio .

I used the car 4 times since install into so don't know with the sub . I played a little bit with the sound system and did put it similar to the screenshots of the te706pl xda forum and when i put the bass and sub it seemed different but have to double check

i have infiniti g35 2005 with bose sysem
[MTCD Android Head Units General] wboops:
Hi guys one thing I need to clear up is the radio was connected to an amp and not to a speaker
[MTCD Android Head Units General] dicabkl:
For me, the experience was a good one. Still don't trust the Chinese industry, because of my personal experience. It's too much "luck" involved for me. But this time I was happy with the result, sound is great for me and the integration with the car was flawless. So, I recommend the upgrade, search a little bit for the best prices. It's a large difference between these.
[MTCD Android Head Units General] marchnz:
This thread. Emperor has no clothes.

Suggest all stop giving this reseller advertising.

These are simply MTCD units, end-of-story.

Skill up and read the MTCD threads.
[MTCD Android Head Units General] Flemischguy:
How do you notify your customers if there is a new MCU or software update? Here on XDA, on FB or by e-mail?
[MTCD Android Head Units General] nielsdc:
Hi Skezza,

You're correct that a DSP doesn't necessarily improve the sound, but the DACs in the ADAU1701 are much better than the ones in the RX5. (Numbers are from the respective datasheet)

RX5 DACs:

90dB SNR

-65 dB THD

ADAU1701 DACs:

104dB SNR

-90 dB THD+N

So it's very well possible that the DSP chip improves the sound quality a lot because of its better DACs and not because of its DSP functionality. (Basically the RX5 DACs are crap, and as you said yourself the amplifier is irrelevant if your input signal is crap).

Of course it would only be a big improvement if the RX5 dacs were used in the non-DSP case and the ADAU1701 is connected digitally through I2S to the RX5 in the other case, but it's certainly possible and no an unreasonable assumption in my view. (And in that case the difference would be a lot bigger than between different amplifier chips.)

Of course the same thing can be achieved using a high quality external DAC instead of the RX5 one, but I haven't seen any manufacturers specifying the use of an external quality DAC.

Niels
[MTCD Android Head Units General] Ben.suffolk:
There is an interesting thread in the MTCD hardware section about adding the DSP to an existing MTCD unit. Costs about £15 for the dsp board from China and a bit of soldering.

The basic difference is that the old sound processor has only 3 parametric EQ on it and they are fudged in the firmware to look like 9, and the new dsp takes the digital audio directly from the android board so your not going to analogue and back again. Clearly it takes the analogue from the radio chip so a better adc helps there.

The dsp allows for full EQ and delay on the outputs etc, so a lot more opportunity to tune the system to how you like it. I'm considering getting the dsp card as its only a few quid.
[MTCD Android Head Units General] skezza:
Let us know how you get on.
[MTCD Android Head Units General] Ben.suffolk:
Will do, but it will take a bout a month for the DSP board to arrive I guess, so don't hold your breath.

It might be worth replacing the Amp chip at the same time, but not sure how much of an upgrade another internal amp will be (I have no space for an external one though). I have the TDA7851L Amp in the unit at the moment.
[MTCD Android Head Units General] bogdi1988:
Got a link? I'll try it also!
[MTCD Android Head Units General] Ben.suffolk:
Link to a DSP Board on Ali Express
[MTCD Android Head Units General] bogdi1988:
Thanks! Also, isn't the unit already coming with a TDA7851 chip built in?
[MTCD Android Head Units General] Ben.suffolk:
Yes that whats in my unit already, I'm not sure if there is anything that would give an improvement. There is talk about the Pioneer PA2030A being a better choice, but I'm not sure how better and if its worth the effort.
[MTCD Android Head Units General] bogdi1988:
It's not worth it. The 7851 chip is already really good.

Also, looking in the pictures on the 1st page, they just have a customized board with the ADAU1401 like the AliExpress link you gave
[MTCD Android Head Units General] Ben.suffolk:
Good to know

Yes the thought about an amp upgrade was different to the DSP upgrade.

I think the the guy who has done the upgrade has made a good job of explaining it all. The only downside at the moment is he had hardwired just one analogue audio from the radio, so it means you can't use the AUX input if you do this upgrade. He does say he is going to sort out an switcher and include details of that as well. So there should be a complete upgrade path once he had documented that bit.
[MTCD Android Head Units General] bogdi1988:
Yeah, right now the whole post looks like a mess. I read his instructions.