Hello,
I am having trouble passing meaningful audio to a Bose factory amp from my PX5 MTCD (said amp comes with my 2013 Mazda CX-9 but I believe that the same hardware can be found in other contemporary Mazda vehicles). Instead of audio I only get a 2Hz very loud beep. The best guess (by me and the PAC guys) as to what happens is that the signal level is too high for the Bose preamp (which is known to have a low impedance) so that the amp is overloaded. I am feeding said amp directly from the preamp outputs of the unit. I believe (but I am not sure) that the way the unit is interfaced with the CAN bus is immaterial to the issue. Indeed, I connected the unit using the included CAN bus adapter as well as a PAC RP4-MZ11 adapter with the same result.
So my question is, is there a way to control the gain of the preamp outputs of such a unit? Do you guys have any other advice on what to try to fix this issue? Wild guesses are welcome (I am willing to experiment).
Thoughts are much appreciated. Many thanks!
In my Audi B7, which also uses a Bose amp like this, I used 2:1 step-down audio transformers along with a resistor divider network on the SPK out from the android headunit. I found the line out level to be too low to drive the transformers, and couldn't connect line out directly to amp due to non-isolated ground.
JAmBer99 said:
In my Audi B7, which also uses a Bose amp like this, I used 2:1 step-down audio transformers along with a resistor divider network on the SPK out from the android headunit.
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Great tip, thank you very much. I will try it as soon as I can. Do you happen to remember the overall resistance and the ratio for the divider?
JAmBer99 said:
couldn't connect line out directly to amp due to non-isolated ground.
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So that's what causes the trouble. Good to know, thank you again. Much appreciated.
For the record, it turned out that my issue was caused by the CAN bus adapter rather than audio source. Strangely enough, the adapter requires that the car be turned on (and that's a full on, not just ACC) for the first time. If this is not the case then max volume beeps are all the sound that is produced by the amp. As soon as the car is turned on once the amp/head unit combination will work thereafter on ACC as well as on ON.
This appears to be a "feature" of the vehicle rather than the adapter, as the same problem manifested itself with two totally different adapters (PAC RP4-MZ11 as well as the adapter that came with the head unit).
With this proviso the preamp outputs of the head unit drive the amp well, so that there was no need for a line converter in my installation. The preamp level is pretty high (so volume beyond 25% or so is unusable) but this can easily be fixed by playing with the gain on the head unit.
Hi all,
I have a Seat Leon 5F with Seat Sound (so including a subwoofer). I've just installed a Witson PX5 W2-V5570 Android 8 unit. It's working fine, except for subwoofer (not working) and probably also center speaker.
On the original system, the signal for the subwoofer is coming from the quadlocker, but this doesnn't seem to be processed in the Android unit..
Anyone familiar with this? Know a solution?
Many thanks!
I'd say cut off the wire and solder it onto the extra cable used for subwoofers. But I'm not sure how the connections on this device are
TomTom1981 said:
Hi all,
I have a Seat Leon 5F with Seat Sound (so including a subwoofer). I've just installed a Witson PX5 W2-V5570 Android 8 unit. It's working fine, except for subwoofer (not working) and probably also center speaker.
On the original system, the signal for the subwoofer is coming from the quadlocker, but this doesnn't seem to be processed in the Android unit..
Anyone familiar with this? Know a solution?
Many thanks!
Click to expand...
Click to collapse
Hello.
Do you still have your head unit ?
Thanks
Yep, how so?
I intend to sell it though. It works, but i cannot get the sound to work properly. I have sound, but it appears it cannot drive all speakers from seat sound.
I have a Dasaita PX6 4gb/64gb with DSP running android 9.
It seems like the subwoofer output is very low, I performed a standard subwoofer amplifier RMS tuning,
Disconnected Subwoofer from NVX Amp, Played a 50hz test tone, and turned up the volume to the maximum on the Head Unit. Then measured the speaker output of the amp with a multimeter. Even with the Level turned up to maximum, I only got about 9 Volts. I'm expecting an RMS level of around 34 volts (sqrt (2ohm * 600RMS))
I checked the settings in the "Amplifier" app and the subwoofer gain was turned up all the way.
With the volume on the stereo at a reasonable level, I was only getting 1-2 volts output of the amplifier.
Anyone have any ideas? is this a DSP/software problem Dasaita needs to fix?
Ive got similiar problem. Any advice how to get biggher preamp for the RCA connections?
I ended up buying an RCA line input booster, like this one
https://www.amazon.com/dp/B003LWV77Y/ref=cm_sw_r_other_apa_i_ARwjDb2NE3SJX
and that solved my problem. I think the voltage that the DSP is putting out is just way too low for most amplifiers to detect and isn't getting past the amp input gate.
I think this is a software fix Dasaita needs to make if their hardware can handle it.
I just installed my head unit and now my factory alpine subwoofer in my wrangler does not work... any ideas?
@hotaudio we have at least 3 people here that are having subwoofer output level problems, can you comment?
Has this gotten fixed? I am looking at buying a PX6 4gb/64gb desaita for outlander Phev 2014.
Sent from my Pixel 3 XL using Tapatalk
No updates that I am aware of. Again I was able to work around it by buying a line level booster.
evilflame2 said:
@hotaudio we have at least 3 people here that are having subwoofer output level problems, can you comment?
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What have you measured the line output to be at 0db to ascertain 'problem'?
marchnz said:
What have you measured the line output to be at 0db to ascertain 'problem'?
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I thought I performed this test with a 0db 50hz test tone, I measured 9volts on my amp speaker terminals, with every volume turned up to maximum (amp, head unit, bass boost etc...)
I expected to be tuning my amp to around 34 volts. After buying the line output amplifier, I was able to accomplish a standard amplifier tuning procedure.
If there is another test I should be performing let me know how to do it. Thanks.
You really need an external aftermarket amp if your expectation is having base. These units dont have a strong amp despite there being a sub out. I have an xtrons. Basic sound was ok, with a jbl amp behind it its mental. Even on the stock speakers. There is no head unit i know of that has good base(sub) out without an external amp.
ghost010 said:
You really need an external aftermarket amp if your expectation is having base. These units dont have a strong amp despite there being a sub out. I have an xtrons. Basic sound was ok, with a jbl amp behind it its mental. Even on the stock speakers. There is no head unit i know of that has good base(sub) out without an external amp.
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That's interesting! I have zero experience with car audio, but love good sound...what amp are you talking about specifically?
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ghost010 said:
You really need an external aftermarket amp if your expectation is having base. These units dont have a strong amp despite there being a sub out. I have an xtrons. Basic sound was ok, with a jbl amp behind it its mental. Even on the stock speakers. There is no head unit i know of that has good base(sub) out without an external amp.
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Sorry if I was not clear, I do have an external amp 750w NVX.
Just to get the sub signal to pass the noise gate so the amp functions, I need the line signal booster on the sub output. That is unacceptable for the price we are paying for a product like this.
evilflame2 said:
Sorry if I was not clear, I do have an external amp 750w NVX.
Just to get the sub signal passed the noise gate so the amp functions, I need the line signal booster on the sub output. That is unacceptable for the price we are paying for a product like this.
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My unit dasaita max6 that I have ordered but not received yet is supposed work with the cars Rockford fosgate system so I imagine it will feed the amp since the RF-amp is a separate unit from the original head unit. So hopefully that won't be an issue... Anyone else with this setup that can confirm/not confirm this working properly?
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Rawb1 said:
My unit dasaita max6 that I have ordered but not received yet is supposed work with the cars Rockford fosgate system so I imagine it will feed the amp since the RF-amp is a separate unit from the original head unit. So hopefully that won't be an issue... Anyone else with this setup that can confirm/not confirm this working properly?
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Most amplifiers have what is called a noise gate, which basically doesn't let the sound through until it reaches a certain threshold (voltage). I guess it would depend on how your car sends the subwoofer signal from the px6 to your amp. If it uses the sub rca jack then you may run into the same issue.
evilflame2 said:
I have a Dasaita PX6 4gb/64gb with DSP running android 9.
It seems like the subwoofer output is very low, I performed a standard subwoofer amplifier RMS tuning,
Disconnected Subwoofer from NVX Amp, Played a 50hz test tone, and turned up the volume to the maximum on the Head Unit. Then measured the speaker output of the amp with a multimeter. Even with the Level turned up to maximum, I only got about 9 Volts. I'm expecting an RMS level of around 34 volts (sqrt (2ohm * 600RMS))
I checked the settings in the "Amplifier" app and the subwoofer gain was turned up all the way.
With the volume on the stereo at a reasonable level, I was only getting 1-2 volts output of the amplifier.
Anyone have any ideas? is this a DSP/software problem Dasaita needs to fix?
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Click to collapse
Hi
Do you know the type of the DSP chip?
I have similar problem with isudar h53 unit. The subwoofer voltage lover than the 4 cahannel voltage.
The filter can be adjusted but the gain not works on sub channel.
DSP chip BU32107EFV
vegfokic said:
Hi
Do you know the type of the DSP chip?
I have similar problem with isudar h53 unit. The subwoofer voltage lover than the 4 cahannel voltage.
The filter can be adjusted but the gain not works on sub channel.
DSP chip BU32107EFV
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How do I determine my type of DSP chip? thanks
evilflame2 said:
How do I determine my type of DSP chip? thanks
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I opend the head unit and checked the chips. In my case the dsp chip was on the back side of main board.
Yesterday I added a signal amplifier for two front ch and the sub ch. Now I can got 3,6V without distorsion of the two front ch but the sub ch at same volume ~2,1V. Checked 50Hz test signal. At the moment Im waiting for the seller response, what about the loudness control and sub gain control why they not work.
Did you get an answer from dasaita about this?
vegfokic said:
I opend the head unit and checked the chips. In my case the dsp chip was on the back side of main board.
Yesterday I added a signal amplifier for two front ch and the sub ch. Now I can got 3,6V without distorsion of the two front ch but the sub ch at same volume ~2,1V. Checked 50Hz test signal. At the moment Im waiting for the seller response, what about the loudness control and sub gain control why they not work.
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Click to collapse
I have the same problem with my sub out channel on my PX6. I upped the gain on my amp to compensate. I have a audio control amp with distortion indicator and cranked it up to about 80% gain without distortion to get good sound out of my subwoofer.
---------- Post added at 06:25 PM ---------- Previous post was at 06:22 PM ----------
evilflame2 said:
Sorry if I was not clear, I do have an external amp 750w NVX.
Just to get the sub signal to pass the noise gate so the amp functions, I need the line signal booster on the sub output. That is unacceptable for the price we are paying for a product like this.
Click to expand...
Click to collapse
Yeah the RCA sub output didnt have enough to turn on my AudioControl amp either. I ended up running the remote turn on wire to the fuse box an tapped there for switched power.
I know this issue too.
Is this caused by the hardware in the radio or is this maybe some software issue? Firmware or MCU maybe?
Hello,
I purchased a used Seicane unit that has no volume out of speaker wires. I bench tested this and also tested in the vehicle trying many different MCU's and ROM's and no luck. Sound is playing just find out of the RCA jacks to an amplifier. I have since upgraded the unit from a PX3 to a PX5 with Android 9 from Witson. Unfortunately, I updated the MCU to 3.14 before I read that you cannot go backwards to the 2.# series. I was wondering if there maybe a setting I can change that would affect this? TIA
Send it back! What did the reseller suggest when contacted for support?
Have the same problem, but I have builded in amp for rear speakers in my car. So at least have some sound, will buy external amp anyway. Px6 android9
Hi guys, hope I'm posting this in the correct section
I have a Ford Mondeo MK4 and bought an Android navigation for it. The navigation is this, or very similar to it (it's an older version, i bought it about 2 years ago). It comes with Android 8.1, 1 GB RAM and 16 GB storage.
Anyways, the amplified sound that comes from it it's not that good compared to the original multimedia system from Ford (not a Sony one, the standard one but still it sounded better).
So, I want to amplify the sound externally, from a car amplifier, specifically Sony XMN1004. I found out that this is a great way to improve your sound and it's decent price convinced me..
The question is: is it possible to amplify the sound from the Android navigation with this amplifier? Can I connect it to the Android navigation? Has anybody done that and has a tutorial, or a recommendation on how to do it? I mean, I think it is not that hard. I noticed that the Android navigation has some RCA cables to connect to the amplifier, but is it like a plug and play operation, or do I need anything else?
Also, forgot to mention that I changed my 4 main speakers (one for each door) with these ones: Hertz UNO X165 (55 W each). They could do much better than they are doing now only with the Android navigation. I know that because i made a speaker out of them with a ~100W board amplifier and it sounds very good. But, I also have a tweeter on each door, would I be able to use them too? I don't know exactly what and where is the filter responsible for the higher frequencies sent to those tweeters, but if they are like on the doors, and then from that filter there are only 2 cables (+ and - ) going on to the Android navigation, than I will have 4 pairs of main speakers + tweeters (one main and one tweeter from each door) going into the Amplifier..
What is your opinion?
Thank you very much!
Well, that's not an FYT, so your question is in the wrong thread.
Still, you can attach the RCA out to an amp, and let the amplifier do the crossover to the tweeters.
Also need to attach the amplifier power signal from the head unit