If It's any help I have the standard 10 speaker hi fi system inc tweeters all removed from my car with known good amp. Not the carver dsp one but regular 10speaker.steve_naive wrote: ↑Sat Nov 23, 2019 7:52 pmNot sure about any of that.Pbondar wrote: ↑Sat Nov 23, 2019 4:53 pm If you have the 676 mid range amp which you replaced with the head unit that has 4 by 50 watts, depending how your wiring harness works it could have pumped 50 watts into the tweeter as the original system drives the tweeter of its own channel without any capacitors as frequency determination has been done by DSP in the oem amp...so no wonder it glows..
I think my car came with the standard amp, hi fi system. I thought the Carver system was the one with DSP?
My harness is the standard harness that came with the car, I used an adapter to connect the new stereo.
Not joined yet? Register for free and enjoy features such as alerts, private messaging and viewing latest posts and topics.
Smoking speaker!
- TomK
- Senior Member
- Posts: 2367
- Joined: Fri Jan 25, 2013 11:50 pm
- Location: West London
Smoking speaker!
MC[IB], CSL airbox, Schrick 288/280 cams, 4.44FD, UUC SSK, SS race cat back, AP CP9660[F]/5144[R] brakes, Apex ARC-8 with AR-1 or PS5, KW ClubSport 2-way, Turner spherical arms, PMC uniball rtab, VB engine mounts, Rogue pulleys & RSMs, Tillett B6, half cage
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Smoking speaker!
Hmmm, well if there is no capacitor on the tweeter then the crossover must be done on the amp / old head unit and if you have bypassed that then there is full frequency range going to tweeter, hence the smoke.
You could of course buy your own crossover but personally I would just add a 10uF 63V capacitor in series. This will crossover around 4KHz which is about right. You can play around with values from the table below:
http://www.carstereo.com/help/Articles.cfm?id=1
If you pm me your address I’ll post you out a couple for free.
You could of course buy your own crossover but personally I would just add a 10uF 63V capacitor in series. This will crossover around 4KHz which is about right. You can play around with values from the table below:
http://www.carstereo.com/help/Articles.cfm?id=1
If you pm me your address I’ll post you out a couple for free.
- steve_naive
- Member
- Posts: 220
- Joined: Tue Oct 01, 2019 2:30 pm
- Location: Northern Ireland
Smoking speaker!
I've just read that the amp does have built in crossovers, so maybe the harness adaptor wasn't enough to address the issue.
- steve_naive
- Member
- Posts: 220
- Joined: Tue Oct 01, 2019 2:30 pm
- Location: Northern Ireland
Smoking speaker!
Done a bit more digging and indeed, you cannot just wire in a new head unit if you have the 10 speaker system with amp (dsp or otherwise).
Really wish I'd known this before spewing 500 quid on a stereo.
Can I really just add a couple of caps to the two tweeters? Maybe even temporarily disable the tweeters?
Really wish I'd known this before spewing 500 quid on a stereo.
Can I really just add a couple of caps to the two tweeters? Maybe even temporarily disable the tweeters?
Smoking speaker!
I did try to tell you...you need to sit down with the respective wiring diagrams of the car and the head unit and work out properly what to do..steve_naive wrote: ↑Fri Nov 29, 2019 12:26 pm Done a bit more digging and indeed, you cannot just wire in a new head unit if you have the 10 speaker system with amp (dsp or otherwise).
Really wish I'd known this before spewing 500 quid on a stereo.
Can I really just add a couple of caps to the two tweeters? Maybe even temporarily disable the tweeters?
From what you said you did, the car and the amp it wasnt going to work properly IMHO...
BMW as well as others don’t make it simple to simply unbolt one unit and replace it with a non oem part..
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Smoking speaker!
...you really can. I wasn’t even joking.steve_naive wrote: ↑Fri Nov 29, 2019 12:26 pm Can I really just add a couple of caps to the two tweeters?
To be fair to the OP, lots of other people (without the premium sound) have done this so you can be forgiven for thinking it was ok.
- steve_naive
- Member
- Posts: 220
- Joined: Tue Oct 01, 2019 2:30 pm
- Location: Northern Ireland
Smoking speaker!
Didn't disagree with you, even if it looked like I did. What I meant was 'I don't understand all that'.Pbondar wrote: ↑Fri Nov 29, 2019 1:14 pmI did try to tell you...you need to sit down with the respective wiring diagrams of the car and the head unit and work out properly what to do..steve_naive wrote: ↑Fri Nov 29, 2019 12:26 pm Done a bit more digging and indeed, you cannot just wire in a new head unit if you have the 10 speaker system with amp (dsp or otherwise).
Really wish I'd known this before spewing 500 quid on a stereo.
Can I really just add a couple of caps to the two tweeters? Maybe even temporarily disable the tweeters?
From what you said you did, the car and the amp it wasnt going to work properly IMHO...
BMW as well as others don’t make it simple to simply unbolt one unit and replace it with a non oem part..
I'm still not sure whether the stereo is connected to the amp or not.
If not, I assume I can go down the route of adding crossovers to the tweeters. But if it is, and the amp is doing some crossover stuff of its own, then won't that affect the values of the caps I'll be wiring in?
In the meantime, I've disconnected the tweeters. Hopefully the other speakers won't explode??
Smoking speaker!
Without the vin number and details of the adapter I couldn’t comment..but it would appear either the new headunit is driving the speakers directly or the headunit is overdriving the existing amp either of which could destroy tweeters
It’s relatively well know that if you overdrive an amp it starts to generate a wide and energetic set of harmonics, that energy by its very nature will burn tweeters out very quickly...
Having leant the hard way not to trust ‘standard’ bmw adapters on the E89 there’s no joy in seeing other people have issues as well..
It’s relatively well know that if you overdrive an amp it starts to generate a wide and energetic set of harmonics, that energy by its very nature will burn tweeters out very quickly...
Having leant the hard way not to trust ‘standard’ bmw adapters on the E89 there’s no joy in seeing other people have issues as well..
- steve_naive
- Member
- Posts: 220
- Joined: Tue Oct 01, 2019 2:30 pm
- Location: Northern Ireland
Smoking speaker!
I've PM'd my vin.Pbondar wrote: ↑Fri Nov 29, 2019 5:41 pm Without the vin number and details of the adapter I couldn’t comment..but it would appear either the new headunit is driving the speakers directly or the headunit is overdriving the existing amp either of which could destroy tweeters
It’s relatively well know that if you overdrive an amp it starts to generate a wide and energetic set of harmonics, that energy by its very nature will burn tweeters out very quickly...
Having leant the hard way not to trust ‘standard’ bmw adapters on the E89 there’s no joy in seeing other people have issues as well..
This is the connector:
https://www.halfords.com/technology/car ... r-ct20bm02
Any help greatly appreciated!
Smoking speaker!
Thnx I’ll look over this over the weekend for you..got the pmsteve_naive wrote: ↑Fri Nov 29, 2019 6:47 pmI've PM'd my vin.Pbondar wrote: ↑Fri Nov 29, 2019 5:41 pm Without the vin number and details of the adapter I couldn’t comment..but it would appear either the new headunit is driving the speakers directly or the headunit is overdriving the existing amp either of which could destroy tweeters
It’s relatively well know that if you overdrive an amp it starts to generate a wide and energetic set of harmonics, that energy by its very nature will burn tweeters out very quickly...
Having leant the hard way not to trust ‘standard’ bmw adapters on the E89 there’s no joy in seeing other people have issues as well..
This is the connector:
https://www.halfords.com/technology/car ... r-ct20bm02
Any help greatly appreciated!
Smoking speaker!
Hello, I’ve looked at the details you sent me..you do have the 676 HiFi fitted
https://www.newtis.info/tisv2/a/en/e85- ... ut/llHlnwX
As a result you have the incorrect adapter when used standalone...
Your new head/amp is overdriving the old amp 676 so it’s likely that you fried the tweeters through overdriving it, causing harmonic distortion, creating n harmonics and frying the tweeters...
There isn’t a simple solution as you have a complex speaker set up as part of 676..
A possible way forward would be to insert some attenuation between the new head unit and the old amp with some inline audio attenuators aka resistors ..
https://www.amazon.co.uk/Rothwell-RCA-I ... B00B7383F8
I would suggest the 15db - 20db preferably 20db ones but it’s a bit suck it and see
You would have to put these in the adapter harness in line ..
Offering advice of this nature remotely is fraught with possible errors /issues but that’s my best guess on the way forward
https://www.newtis.info/tisv2/a/en/e85- ... ut/llHlnwX
As a result you have the incorrect adapter when used standalone...
Your new head/amp is overdriving the old amp 676 so it’s likely that you fried the tweeters through overdriving it, causing harmonic distortion, creating n harmonics and frying the tweeters...
There isn’t a simple solution as you have a complex speaker set up as part of 676..
A possible way forward would be to insert some attenuation between the new head unit and the old amp with some inline audio attenuators aka resistors ..
https://www.amazon.co.uk/Rothwell-RCA-I ... B00B7383F8
I would suggest the 15db - 20db preferably 20db ones but it’s a bit suck it and see
You would have to put these in the adapter harness in line ..
Offering advice of this nature remotely is fraught with possible errors /issues but that’s my best guess on the way forward
- steve_naive
- Member
- Posts: 220
- Joined: Tue Oct 01, 2019 2:30 pm
- Location: Northern Ireland
Smoking speaker!
Makes sense, will look into it.Pbondar wrote: ↑Sat Nov 30, 2019 10:40 am Hello, I’ve looked at the details you sent me..you do have the 676 HiFi fitted
https://www.newtis.info/tisv2/a/en/e85- ... ut/llHlnwX
As a result you have the incorrect adapter when used standalone...
Your new head/amp is overdriving the old amp 676 so it’s likely that you fried the tweeters through overdriving it, causing harmonic distortion, creating n harmonics and frying the tweeters...
There isn’t a simple solution as you have a complex speaker set up as part of 676..
A possible way forward would be to insert some attenuation between the new head unit and the old amp with some inline audio attenuators aka resistors ..
https://www.amazon.co.uk/Rothwell-RCA-I ... B00B7383F8
I would suggest the 15db - 20db preferably 20db ones but it’s a bit suck it and see
You would have to put these in the adapter harness in line ..
Offering advice of this nature remotely is fraught with possible errors /issues but that’s my best guess on the way forward
Thanks!
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Smoking speaker!
The thing is though, if you are overdriving the amp into clipping it would sound awful. If you are getting good quality sound then I doubt its clipping. A 10uf 63v capacitor in series with each tweeter is probably all you need to do to get an acceptable solution but I’m not going to keep going on about it!
Smoking speaker!
Hi ph001...if the output from the OE amp was broadband / flat then this is logical, in theory, the output has been processed by the amp to specifically segment the frequencies into their respective ranges for the relevant speakers..ph001 wrote: ↑Tue Dec 03, 2019 1:09 am The thing is though, if you are overdriving the amp into clipping it would sound awful. If you are getting good quality sound then I doubt its clipping. A 10uf 63v capacitor in series with each tweeter is probably all you need to do to get an acceptable solution but I’m not going to keep going on about it!
Of course belt n braces is not bad as an engineer gaffa tape...what do you compute the cut off frequency and slope based on your suggestion?
There have been cases where harmonics have not been heard by the user but done rapid damage to tweeters due to the extended range of frequencies well above audible range..
Interestingly my after market amp has dire warnings about tweeter destruction due to either over driving the new amp and/or not having a suitable frequency roll off..
- ph001
- Lifer
- Posts: 3870
- Joined: Mon Oct 31, 2016 5:53 pm
- Location: N. Yorkshire.
Smoking speaker!
A 10uF cap will crossover a 4ohm speaker at around 4Khz and rolloff at 6db per octave.
Depends how teccy you want to get but the impedance of a tweeter is dominated by 2*pi*F*L so as the frequency rises, so does the impedance. I have never seen a tweeter damaged in practice by feeding it frequencies over 20kHz, despite the scare stories you might read on the web.
Depends how teccy you want to get but the impedance of a tweeter is dominated by 2*pi*F*L so as the frequency rises, so does the impedance. I have never seen a tweeter damaged in practice by feeding it frequencies over 20kHz, despite the scare stories you might read on the web.