The article below discusses common audio issues you may experience with your LOGIC7, standard ASK system, or both. The LOGIC7 amplifier and ASK module are used in the Rolls Royce Phantom and BMW E65, E66 models.
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THE AUDIO SYSTEM
The audio system is available in two variants, standard 6 speaker Hi-Fi, and BMW LOGIC7 also referred to as ‘Hi-Fi Professional DSP’, ‘Top Hi-Fi’ or ‘Premium DSP’.
The standard Hi-Fi system has the following configuration:
ASK Module:
– 2 Front Mid Range Speakers and Tweeters
– 2 Rear Deck Mid Range Speakers
– 2 Subwoofer Pre-outs (fed directly to Hi-Fi Amplifier)
Hi-Fi Amplifier:
– 2 Underseat Subwoofers
Summary:
Conventional analogue amplifier, analogue audio is received from the ASK module and amplified for the two subwoofer channels.
Common Failure Modes:
ASK:
– Failure of one or more front or rear deck speaker outputs, usually crackling, distorted or no audio output. This is an ASK related failure.
Hi-Fi Amplifier:
– The subwoofer amplifier is very reliable and rarely suffers any failure symptoms.
The LOGIC7 system has the following configuration:
ASK Module:
– 2 Front Mid Range Speakers and Tweeters
– 2 Rear Deck Mid Range Speakers
LOGIC7 Top Hi-Fi Amplifier:
– 1 Centre Mid Range Dashboard Speaker
– 2 Rear Door Mid Range Speakers
– 2 Underseat Subwoofers
Summary:
Digital amplifier with full DSP (Digital Signal Processing) and 7 channel graphic equaliser. The audio data is received from the ASK (Audio System Controller) via a fibre optic connection, it is decoded, processed to enhance the sound and staging effects before being converted back to analogue and fed to the internal 5 channel amplifier.
Common Failure Modes:
ASK:
– Failure of one or more front or rear deck speaker outputs, usually crackling, distorted or no audio output.
LOGIC7:
– Sub-woofer output failure, resulting in crackling, distorted or no bass output.
– One or more of the three mid range speaker output channels can suffer crackling, distorted or no audio output.
2002-2005 Pre Facelifted ASK UNIT (CD-Player)
2006-2008 Face lifted ASK UNIT (CD-Player)
Standard problems with ASK AUDIO CONTROLLER:
– crackling, static noise from front doors and rear deck speakers. No sound at all. Therefore it will affect all service sounds like:
-PDC (parking sensors) not beeping, no NAVI guide voice, door chimes, warning sounds etc.
– in some cases ask unit controller is not responding to fibre optic signals causing MOST fibre optic bus failure. But it does not mean the problem is your ask unit or Logic 7 amp, it could be any device in the MOST BUS network, to troubleshoot and find out which module is causing failure I will cover in details in my next post, stay tuned.
THIS VIDEO SHOWS HOW TO REMOVE LOGIC 7 AMPLIFIER
How to remove ASK CD PLAYER UNIT?? EASY!
LOGIC 7 TOP HIFI AMPLIFIER 2002-2008
FIRST GENERATION BAD DESIGN L7 AMPLIFIER 2001-2006:\
NOT ALWAYS FIXABLE…. 50% SUCCESS RATE.
GOOD AMPLIFIER DESIGN AFTER 2006. 4 CLIPS:
VERY GOOD SUCCESS RATE ABOUT 90%
BMW Logic7 amplifier is a fiber optic controlled amplifier with FIBRE OPTIC CONTROLLER AND HIGH SPEED 24 BIT DSP PROCESSOR, therefore you can not install regular aftermarket amp. It produces 5 channels:
-sub woofers under front seats 8″ shallow type
-rear doors
-front center speaker in the dash
Any problems with those speakers are related to the AMP and have nothing to do with the speakers most of the times, but sometimes sub woofers get flooded and therefore can be bad, causing amplifier failure. Speakers can be easily tested: it should show about resistance=4 Ohms.
Main problem is that modules inside the amplifier overheat and die, the only way to rebuild i is to replace it, unfortunately BMW or Becker made it impossible due to non standard mini modules. we redesigned the entire system and since 2009 we did not have any returns.
Please do not even think that capacitors went bad, it never happened, but you can always check them if they are ok, before replacing it (makes sense?). But since 2009 and ~280 amps fixed none of them had bad caps.
Another problem with Logic7 amps is that when it does not sound right, those burnt modules overheat entire amplifier causing Logic board to fail, so if your amp isn’t doing well its better not to use it and fix it ASAP.
In most of the cases, APPLIES TO CARS BEFORE 2004 (AFTER 2004 THEY CHANGED SOFTWARE AND SETTINGS ARE ADJUSTABLE EVEN WITHOUT ANY AMPLIFIER CONNECTED!) if Logic7 level AND EQ SETTINGS ARE adjustable in the menu (entertainment), 
it means that logic board is still okay and it is fixable, but if you don’t have any sound, or if its cutting in and out, it means that Logic7 amplifier is causing MOST bus failure, and lots of things are not working in your IDRIVE:
-navigation isn’t working at all.
-is not showing consumption and other things.
-cd changer making noise trying to find a CD.
HOW TO BYPASS NON WORKING MODULE??? EASY!
HOW TO DIAGNOSE MOST BUS FAILURE ON ANY CAR WITH MOST FIBRE OPTIC NETWORKGET THIS P/N FROM ANY BMW DEALER 61136917541, YOU CAN GET IT ONLINE FROM ECS TUNNING ECS TUNNING FIBRE OPTIC JUMPER. YOU HAVE TO REMOVE INNER PART WITH SOME FLAT SCREWDRIVER OR A KNIFE, YOU CAN ALSO USE ZIP TIE IF YOU PLAN TO KEEP IT
In my next Post i will cover how to diagnose MOST bus failure and what device causing it, because it could be any device in the MOST bus network, and to find it out you either need bmw software and cable or i will explain the way on how to diagnose it without anything.
IF YOU DECIDED YOU NEED HELP WITH REPAIR, PLEASE SEND YOUR AMPLIFIER OR ASK UNIT OR BOTH (550$X2) HERE ALONG WITH 550$ PAYPAL PAYED TO LOGIC7REPAIR@GMAIL.COM.
We have also EBAY add, so you can see real feedback.CLICK THIS LINK BELOW, MAKE A 550$ PAYMENT, PRINT A RECEIPT AND INCLUDE IT IN THE BOX WITH YOUR AMPLIFIER OR ASK UNIT AND SEND IT TO OUR ADDRESS (SEE BELOW). USUALLY IT TAKES 1-2 DAYS TO REBUILD IT AND 2-3 DAYS SHIPPING. INEXPENSIVE AND FASTEST SHIPPING IS USPS PRIORITY MEDIUM OR LARGE BOX (15$).
if your car facelifted 2006 and up, its 99% guaranteed its fixable.
before 2005 logic7 amplifiers are not always fixable, so if you have cutting in and out, or it plays only from front speakers and Logic7 level is not adjustable, most likely we cannot help, but you can still bypass it and install standard amp, though it will not sound like original one, though much cheaper.
IF YOU ARE STILL HAVING PROBLEMS DIAGNOSING YOUR AMP FAILURE PLEASE GIVE US A CALL OR TXT IF NO ANSWER, SO WE WILL CALL YOU BACK, BUT PLEASE READ THE ARTICLE FIRST, IT EXPLAINS A LOT IF NOT EVERYTHING.
NOTE: If you don’t have any sound and cannot see NAVI, FM stations, CD tracks changing or playing, it means you have at least one device failure in the MOST network and you have to find out which one (most common are: NAVI, SVS, CD changer, ASK, L7, FM tuner) is causing this problem, i will be describing it in my next post.
Front door speakers not working along with subs. I changed amp and front door speakers still not working and passenger sub crackling bad. Do I need to try a 3rd amp or try a new ask unit?
you need ask unit fixed and logic7 amp
Everything is working fine except I have no bass and the logic 7 is not adjustable. I will get occasional, maybe every few weeks, pops or the display will blank and logic 7 is adjustable and the goes back to unadjustable within a few seconds. I checked the red lights in the bus system and they are all on. Any suggestions would be appreciated.
Your L7 amp is fried… Too late to fix, you need another working amp… Let me know if you need any
In my 06 750i I noticed the drivers’ under seat sub was not producing bass and just crackling and farting. I unplugged the sub and the sounds have stopped but obviously with no bass from one side of the car I’d like to remedy the situation ASAP. There was no visible damage to the sub, it just stopped working one day after playing a couple songs at max volume. I was going to assume the sub was blown but after reading this have to give getting an amp rebuild a second thought. I feel as if the sound could be more crisp and think the amp is definitely on its way out. How long does it take to get it rebuilt from when you receive it til its out the door?
Hi,
You need your amp fixed. We can do it for you
Hello. My logic seven settings are not able to be adjusted in idrive menu so does this mean my logic7 amp is not fixable?. Also when i unplugged my navi unit i didn’t see a red light so does this means this is also not working? Thanks for input
Yes it means logic 7 is not sending red light to svs and navi
Hello i have a 2006 BMW 750Li and i have a cracking sound coming from the front speakers. i can’t seem to find out what is causing it. what is the best way to identified the issue.
Front doors>> ask CD player head unit
I have A 2008 BMW 750LI and the driver side sub is not working at all. All other speakers work and the L7 functions work on the iDrive. Could this most likely be a blow sub, or do the connections ever come loose? Thank You
No, it’s your amp needs repair.
Hi,
I have a 2006 BMW 750i and recently I noticed that my rear speakers (above the back seats) and the front right top speaker is not working. There is also no beeping sound from the parking sensors (the only beeping I hear is from the left front side by the driver)…I assume the parking unit is connected to these speakers only and somehow they have failed…any suggestions?
Thanks.
You need your head unit fixed at least. Let us know if you need help
Hello, I have a 2003 745Li with Logic 7 and my sound is completely out on everything , cd changer cycles through continuously, I can not adjust logic7 on idrive, no fm/am stations ect… I changed my voice module and my am/fm came back but still no sound. Does this sound like my amp?
Yes… Amp is dead
hello,
Not sure what the problem is but people say it’s the AMP but it appears that everything works fine… Just no bass anymore.
It seems like if I hit a bump or make a turn sometimes it comes back on and I fall in love with Logic7 again. It sounds so good.. but a few minutes later, if I try to raise the volume or ?hit another bump?, it goes off again. I always thought it was a loose wire but everyone has been telling me it’s the AMP.
If it is, and if I would like you to repair it, is removing/reinstalling it fairly easy?
Amplifier is bad 100%
Hi. I have a bmw 730 2003. It has the standard ask unit. My sat nav, phone radio, works perfect. But I get no sound if I put a CD player in. I get faint crackling only. Weird thing is I don’t get any issue if I tune into the radio. Can u help
Sounds like ask unit problem, especially the loader mechanism with DAC chip