Distorted (over amplified??) sound with JBL

Thank You to friends who made illustrations for instaling GPS and cameras.

After long delay I got unit from China on this Friday, the units looks same as ottonavis.



What I like -
Screen quality very good
Fast unit
Bluetooth buttons works on steering wheel
Voice command button for mute (not bad)

Now problems

After installing unit to dash

1.I start unit, select E. amplifier mode and was upset
Sound quality was bad, it’s like distorted on high frequencies (over amplified)


After I note that cannot access sd card, so when I pressed NAVI button it give me info file not found, interesting when I connect usb flash drives to usb cables drom unit I listen USB connection SOUND but cannot access USB Flash drive.
I went home and check sd card from headunit and usb flash drive
Was surprised micro sd card empty no GPS software at all.
USB Flash drive was formatted on NTFS, I formatted to FAT32 again cannot access, after formating to FAT can access files from USB FLASH DRIVE

Micro SD card from head unit was formatted to FAT32, copied some mp3 files and the result - when I plug sd card to unit – nothing.


Now my question

1. Is possible to adjust sound level on JBL input or on UNIT using some service menu if its available
I think that sound to JBL Amp higher than it should be (maybe I’m wrong)

2. What type of file system this units reads
3. Can I download and install US gps software (Chinese, original etc.)

4. Is it possible to fix sd card problem upgrading firmware (BTW firmware EN-PRIMA-ARM-SLC-V1.40)

 

Hi thank You for reply.

Last month when I tried to order I saw this unit only on ebay – one store was in California (I think it was ottonavi) another “Fedom” China. But it disappear from Californian store when I was ready to buy and I ordered from China.
Why I decide to buy this unit because a lot of info on European and Russian car electronics forums and most of owners are happy with “Roadrovers”….
Interesting that here in US (I see this on this forum) and Fedoms customer service very responsive and honest.

…
Today I contacted to seller, they promise send me some new firmware upgrades. And got some new info from manufacturer about JBL.

I’ll try make experiments and let you know.
Interesting that from iphone via bluetooth much better probably because sound from iphone lower.

Interesting what quality with other jbl kit like metra or other kits from Best Buy,
On our units JBL kit just cable with 2 different connector

And kits from Canadian store or Best Buy has some box (interesting what inside this box?)

(It seems my device and ottonavi’s - Roadrover and model D2271 I got this info under bluetooth settings on iphone)

 

Just now I checked something, i think its good news about sound.
Using update.exe file I found this file on other forums it was possible see windows ce desktop, on control panel I change sound level and now I have excellent quality sound, next question how to save this, because as soon I restart system sound on wince control panel again maximum.

 

After Firmware and MCU update the same problem.

 

Today I did install Schosche Toyota Interface (from Bestbuy) and no more distortion.
Schosche Toyota Interface has bad review on Internet and not adjustable but it was on local store. Next week I'll order Metra interface (I think on Metra you can adjust gain manually) Anyway some success for JBL owners. (I check only sound on USB flash drives, navigation, dvd, didnt check CD)
Another problem on my unit - after firmware and MCU upgrade FM and AM doesn't work (I think after MCU)
Will contact seller again on Monday. Hope buggy software.

 

I use RCA Cables from unit and connect to Schosche using color code on manual
From big connector I used only red, yellow and black wires (see picture).
AMP wire from unit I connect to blue white.

Interface model: Schosche TA07SR
Unit Interface change to I-Amp