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.
yes, it means all amps you tried were no good. We can repair it with 12m warranty and you will be satisfied with quality and most likely it will outlast your car. please email me if you need help.
you need to troubleshoot which device has failed, please check my article on how to diagnose MOST bus failure
according to what you are saying you have both issues: ask unit and Logic 7 amp. Make sure you have Logic7 sound system, because if you cannot find it in the menu- most likely you dont have it or you didnt find.
but if you dont have L7, those small amps almost never die and susb should work.
if passenger front, then it is your ask unit, please read my posts carefully, it explains everything in details.
Driver speakers work fine. Passenger side does not. Ask unit or amp?
Hello. I have sound…only the rear speakers by the rear windshield or the rear door speakers. Sometimes the front speakers come on and then cut off. Sometimes the door chimes sound amd tgen dont. I have not yet seen sny adjustable settings for the L7 amp on the idrive.i have heard a crackling soind from the other speakers. Gps is unhooked via a fiber optic bus. I do have sound but no subs and fronts.
Hi ,I am from Turkey and ı got a same problem ,that u write on the site.. —– (- 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. ) No radio frequencies showed on the scren,no cd and cd changer avaliable on the screen )
what can ı do? please hep me ?
Hello,
Great post, a lot of good info.
I have a question (you cover some of the answer here), my amp went bad -bad board and I had to find a new one, actually, I have tried four new ones (used) amps and they all sound bad, meaning, there seems to be too much bass even with the settings flat. There’s no distortion or crackling just excess bass and everything in the car works, just can’t seem to get the sound right.
You mention on the article that modules go bad, does this mean all amps I’ve tried could be bad? and does that mean that I would need to have the one I have, fixed, to get it to control the sound better?
Thanks,
Greg
Hi,
first of all you need to make sure MOST bus is not interrupted. If Logic7 level in the menu is adjustable,
it means MOST bus is okay, but in your case it sounds like you’ve been driving for a while with overheating amp. Is Logic 7 level adjustable? Navi works?
I have a 2005 bmw745li and it have the logic7 system it start off with the cracking noise and now nothing but, sometime the system will pop on when I start the car up but, then it will go out.also my subwoofer are not working.