|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Search | Today's Posts | Mark Forums Read |
|
BMW 3-Series (E90 E92) Forum
>
Warning Gong sound to loud after amp install
|
|
07-20-2021, 07:07 PM | #1 |
11 328i xdrive
2
Rep 42
Posts |
Warning Gong sound to loud after amp install
I finally got all my amps and dsp connected and set my gains by DMM to the recommended voltages.
I already have the hifi system. Already set my gains. My amps are a jl audio xd 600/6v2 and jd 500/1 with bavsound stage 1 . And a TWK 88 DSP On my dsp when I set input voltage sensitivity I had to set it down to 350mV any higher and it would bring the gauge into the red on the dsp software display. I followed other posts for installing the amps and used technics harness for the connections. I set the input level selector to high as everyone else had said they did. And now my door open, seat belt warning gong is real loud even with the setting in the idrive for it set to its lowest possable setting. I tried to set the input level selector to low and readjusted my dsp input gain and amp gains but it made everything not any louder then the factory amp but the gong sound was back to normal, but everything else was weak so I went back to the high level and reset the gains again and sound is good except for my gongs is there away around this or is it something I will just need to deal with? I've read plenty of posts that say gains are to high, but if I lower them it is like I never did any amp upgrade, besides they are set to the max unclipped amount for the amp and speaker |
07-21-2021, 02:29 PM | #2 |
Lieutenant General
1904
Rep 13,081
Posts |
gong and pdc have volume level setting's with the idrive not sure about
the pro radio. Also there are some programmable levels in the Radio Files or Idrive files if you can find and program them. https://www.bimmerfest.com/threads/e...advice.763333/ https://www.e90post.com/forums/showt...ht=gong+volume Last edited by ctuna; 07-21-2021 at 07:24 PM.. |
Appreciate
0
|
07-22-2021, 10:25 AM | #3 | |
Lieutenant
528
Rep 428
Posts |
Quote:
Set your amp/DSP gains so that the volume on the head unit at 45 clicks is the maximum loudness you would ever listen to music. I believe Musicar said at 50-55 clicks the head unit signal begins distorting. It sounds like the DSP gains are turned up way too high. Last edited by bmw335ie90; 07-22-2021 at 10:32 AM.. |
|
Appreciate
0
|
07-22-2021, 11:36 AM | #4 |
11 328i xdrive
2
Rep 42
Posts |
I am going to start from scratch on setting the dsp input and output sensitivity. And set my amp to the recommended gain setting I found online by jlaudio for them when using the twk dsp. And see. I bought a cheap oscilloscope that I am going to try and use to determine the max unclipping volume for the head unit first though, once I figure out how to do that lol
|
Appreciate
0
|
07-22-2021, 11:37 AM | #5 | |
11 328i xdrive
2
Rep 42
Posts |
Quote:
|
|
Appreciate
0
|
07-22-2021, 12:23 PM | #6 |
11 328i xdrive
2
Rep 42
Posts |
Another thing I noticed is using the technic harness when ever the car wakes up, like unlocking the door open trunk etc the dsp turns on and amps turn on aswell, untill the car goes back into sleep. I'm worried if I forget to lock my doors that when the car randomly cycles the fuel pump that it will turn everything on again. Is there away around this or is it something that has to be dealt woth when using the remote in from the harness?
|
Appreciate
0
|
07-22-2021, 01:54 PM | #7 | |
Lieutenant
528
Rep 428
Posts |
Quote:
|
|
Appreciate
0
|
07-22-2021, 07:57 PM | #9 | |
11 328i xdrive
2
Rep 42
Posts |
Quote:
|
|
Appreciate
0
|
07-22-2021, 09:12 PM | #10 |
Lieutenant General
1904
Rep 13,081
Posts |
do you have a good ground for your probe.(scope probe)
If you are turning up the gain to point you hear ground his it's probably to high. I would say most people make the level adjustment by ear. Last edited by ctuna; 07-28-2021 at 02:21 PM.. |
Appreciate
0
|
07-23-2021, 06:21 AM | #11 |
11 328i xdrive
2
Rep 42
Posts |
I belive I do I made a custom one with old rca connector, middle to positive and shield to ground then just plugged into the rca of the harness. Which I doubt but never know.
I honestly can not hear distortion mainly because I always have background noise in my garage and I am afraid to play the speakers at 3/4 volume for a long period without knowing if the gains are already to high or not a tech from jl audio told me to try running the sub with one rca unplugged to see if polarity is reversed on one of the outputs of the harness or some where along the way causing cancelation so will try that for the bass problem. |
Appreciate
0
|
07-23-2021, 07:21 AM | #12 |
11 328i xdrive
2
Rep 42
Posts |
I also wonder if the lower volume is from the bavsound speakers them selves since everyone says they need to be played for awhile to break in. Or if they just can't handle the power that the jl amp is putting to them since supposable they are only 40watt and I'm putting around 75 watts to them
|
Appreciate
0
|
07-25-2021, 07:30 PM | #13 |
Lieutenant
528
Rep 428
Posts |
What are your gains set at? The amp gains should be no higher than half way if the amp is sized correctly, this also depends on the speaker resistances though. The dsp will likely have two settings, a high level and low level input setting. If the dsp is set on high level, the gains will likely need to be pretty high (possibly max). If the dsp is set for low level, i would expect the dsp gains to be all the way down and the gongs way too loud.
|
Appreciate
0
|
07-25-2021, 09:31 PM | #14 |
11 328i xdrive
2
Rep 42
Posts |
I have my amp gain set at about 9 o'clock position max unclipped output measured with an oscilloscope. On the low level input sensitivity.
I have the input sensitivity on my twk 88 dsp set to 500mV it is the setting that brought the vu Meter to full yellow bars with out any red. Then I set each out put level trim to be my max unclipped by having to turn down some channels, like I had to turn down my sub level by 7db so it wouldn't be in the red of the vu meter. The gong sound now is controlled by my dsp control knob which is fine since I can lower it when I start the car or door is open etc. Could it be because the volume on the head unit is at 40 clicks up and I am using my dsp control to control my volume? |
Appreciate
0
|
07-25-2021, 11:40 PM | #15 | |
Lieutenant
528
Rep 428
Posts |
Quote:
If gongs are too loud, a gain is too high. Set everything at minimum and tune by ear from there. Read the user manual on the dsp to figure how to properly set the input and output sensitivity. This is likely causing the issue. The gain on your amplifier should be at the lowest possible setting to produce maximum sound volume at 40-45 clicks on the head unit. |
|
Appreciate
0
|
07-26-2021, 01:10 PM | #16 |
11 328i xdrive
2
Rep 42
Posts |
What confuses me on the input of the dsp
Manual says to play a test tone so I play 1000hz tone then it say to select the input voltage that brings the vu Metter bars up till they are completely in the yellow no red which is only 350mV if I goto 500mV I get the red bars if I goto the 1volt or any higher I get red bars aswell. Twk manual says to play pink noise but jl tech support says 1khz tone., amp gains set to 11 oclock and twk output level to max of 0db Which then I am able to bring the input upto 2 volts but then my output vu meter shows red bars and overall volume is real low even with headunit at 45 clicks. So I found best output is at 350mV input with amp gains even lower at like 9 o'clock position and then system is loud and bass pounds. So with input at 350mV outputs adjusted so no red bars showing, I hooked up my oscilloscope to the amp output and there is no clipping so I have stayed with this setting, which gives me zero hiss, unlike before I would hear a static sound from speakers with volume all the way down. And gongs are adjustable with the volume of the dsp master volume control. I took one quick measurement with an rta and pink noise at I belive was 50% volume and all speakers plus sub connected and looks like I need to make one cut only so far |
Appreciate
0
|
07-26-2021, 04:47 PM | #17 |
Lieutenant
528
Rep 428
Posts |
The hifi head unit outputs 4-5V RMS. By setting the input voltage on your dsp to 350 mV, the dsp is massively over boosting the signal and causing your loud gongs. I don't know why you are using the dsp to control master volume, that is what the head unit volume knob is for. Gains on your amps also don't sound correct either if they are almost at the max setting.
If I was you I would take your car into a stereo shop and have them tune it. Setting input and output gain is the easiest part of a dsp setup. The difficult part is setting proper crossovers and tuning custom equalizer settings for each individual speaker. |
Appreciate
0
|
07-26-2021, 05:25 PM | #18 |
11 328i xdrive
2
Rep 42
Posts |
My dsp has the drc control knob that you mount up front, with it I can control the master volume or the subwoofer volume. Problem is the only audio shop near me if you even want to call it that is best buy mobile install.
And the eq and cross overs I actualy have an idea how to do, I just can not get the input sensitivity to be set higher, without having the over all volume being hardly at all better then the factory amp and then amp gains having to be real high aswell. My dsp output voltage is a 4 voltage output to my amp which is done by the cross over, so no matter what setting it use it will put out 4 volts to the amps. I thought the higher input voltage would mean the lower the amp gains had to be set not the opposite |
Appreciate
0
|
07-26-2021, 05:50 PM | #19 |
11 328i xdrive
2
Rep 42
Posts |
And if I use a pink noise to set the input sensitivity I can set it to a higher voltage then when I use the 1khz sine wave. And according to the oscilloscope my headunit clips at 42 clicks so that is where I have left my volume, would be nice if we had a damn volume level bar or numerical display to know exactly where we are instead of having to mute the radio then start counting clicks
|
Appreciate
0
|
07-27-2021, 10:08 AM | #20 |
Lieutenant General
1904
Rep 13,081
Posts |
If you read the rad file (file for the radio it does have a volume option toward the end)
How useful it would be remains to be seen. top_hifi_tcu VOL_TEL_MIN wert_0 VOLUME_TABLE e91_hifi MY_INFO_RAD2 nicht_aktiv V_INFO_RAD2 nicht_aktiv PHONE_PROF_RAD2 aktiv |
Appreciate
0
|
07-28-2021, 09:01 AM | #21 |
11 328i xdrive
2
Rep 42
Posts |
I dont know but I am about to give up, I got the radio to produce a nice clean sine wave at 1000hz at 45 clicks on the radio and my output from the rca on the technic harness is still only .038 volts. And even with amp gain all the way down on low level input setting on the jl audio xd 600/6 if I mute the radio I still hear static.
If I disconnect input rca for the twk dsp static is still there. If I disconnect the rca from the amp it goes away. It is only coming from the front speakers rears, underseat and sub are all clear. Gong sound is controlled by the volume so if I have radio volume muted no warning chimes, if radio is max volume chimes are real loud. I am using good rca cables not the cheap ones, mine are twisted and shielded cables and are not run near power wires, I ran them under the amp rack and power and grounds are ran on the top of the amp rack which is 1/2 inch mdf. I ran my ground to the factory ground point on the drivers side rear wheel well where all other grounds are. Has anyone ever taken a voltage reading of the rca connector of the technic harness for the amp bypass harness not the add a sub harness? Or willing to take a measurement at a 1000hz tone for me so I can compare to mine? |
Appreciate
0
|
07-28-2021, 09:46 AM | #22 |
11 328i xdrive
2
Rep 42
Posts |
Got a reply from technic
"The OEM HU outputs a balanced signal of about 4V at 47 clicks of the volume knob. This is a balanced signal, which means that both the shield and the center of the RCA have voltage : +4V center and -4V shield. There is no ground. If you ground the shield then you may short the OEM HU. Harness has nothing to do with the OEM HU voltage." Does this mean since I connected my dmm positive to the center pin and negative to the shield that I may have shorted out my headunit? |
Appreciate
0
|
Bookmarks |
Thread Tools | Search this Thread |
|
|