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.
Hello there, wonderful articles!
I have a problem with my radio, I tried hard to find info. on different sites but failed… I believe you can point me into right direction.
Everything works fine in my car’s infotainment system (SVS, TV, DVD, NAVI, CD, Tape, PDC) EXCEPT RADIO! both AM & FM sounds static, I can see the memorized channels on screen and change them but no sound except static…. what could be the problem? I have no tints on the rear glass, the antenna lines look fine… please help
Thanks & Regards
most likely you radio tuner module in the rear c pillar driver side, if you have hd tuner then it is in the back
Hi my name is Andrey and I have a 2003 BMW 760 with a logic 7 sound system at first I had a problem the stereo was not working at all so after doing some tests I found out that my phone module was not working because after I bypass it with the fiber optic loop everything comes back and works fine but I have no base and I can’t control my logic level so could it be possible that the amp is also bad and can it be repaired. If its something you guys can repair what’s going to be the cost and how long will it take to have it fixed properly please let me know as soon as possible
we can repair it, but most likely you need another unit, since it was obverheated
yes we can repair it. email for any questions or call
You seem to know everything about the Logic 7 system. Which is great! I have an ’02 745i I purchased recently from the 2nd owner. They were told by the dealer that the amp is bad. I don’t doubt it, but everything is available onscreen including adjustments, except the Navi. It does not come on at all. Does this mean the Navi is bad too? And how can I check it to find out? Some sound from front speakers only. You mentioned that the amp is programmed to the vin. The date stamp on the amp is 2005. Will repairing the amp fix everything? Thanks.
yes navi is bad too if you still getting sound from front dpeakers. amo needs repair
I have a 2006 750 li at first I was getting crackling sound on my speakers. then one day I came outside and I had no sound After 2 Hours the sound came back on. so I replace the front speaker,it sounds good at a low level but when I turn it all the way up the sound goes in and out what could it be?
amp is bad. email for repair info
Hi there…. I have a 2008 335i with the logic 7 system. I recently accidentally had some water get into my amplifier in trunk. I dried it out and worked ok for awhile but then started acting up.
It plays but not deep bass and sounds like rear speaker blown but from what I see in your posts it is probably not the speaker and just the amp.
I took the amp out yesterday and tried cleaning it up with some corrosion x spray but it is still messed up. Is something that you guys can fix? Please let me know …thank you!!
its flooded. very common issue and happens bc of trunk seal clogged.
you can send it for repair and it might get fixed but if its really oxidized we cannot help yoiu either
hi, I have a bmw 645ci 2004 with logic 7. my radio, sat navigation and pdc work fine but I have no sound coming from them when they are activated. I also don’t have the door gong sound either. any help would be appreciated..Thanks
your amp is flooded most likely and needs repair or replacement.
your trunk seal or drain pipe is clooged
oh by the way I used a maxi das dianostic tool no faults came up and I noticed when I used the fiber optic stick to check out whats going on I had no laser switching or illuminated seem no fiber optic please help me
means one of the units is bad and MOST bus interrupted. check my post aout how to find the faulty unit
I have a 2004 760li nothing works, no radio, GPS,CD player. Took it to dealer they said it needed a radio control module and GPS I had amp repaired and someone replaced my battery without registering new battery and everything went dead. What do you suggest!
no battery related, you need to diagnose it yourself, could be bad amp or navi unt
hi I have a 730d e65 2004 and I had crakling through speakers for a few years and my stereo stop working because the cd changer decided to eject the magazine so I put in the fiber optic stick in the cd changer so the system worked without the cd changer but when I turn up the volume it turned of and came back with a lower volume instantly but now my single cd don’t work the fm am radio don’t work cant select the voice control or any bleep the date and time units not showing
most likely amp is bad, but could be any unit in the network
In my E65 with Logic7 the sound is good at normal volume.
But when I turn the volume up the subwoofer on the right side sounds “blown”. This started 2 weeks ago.
Is this an amplifier problem and can it be fixed?
amp is bad and needs repair
How much to just buy a logic 7 amp of you
better if you send your unit for repair, amp has VIN number coded