What is option code 680 (Nokia DSP (Digital Sound Processing) audio system)?

My new (to me) 1999 has option code 680. When I looked it up , it looks like that corresponds to "Nokia DSP (Digital Sound Processing) audio system". I have no idea what this is. The Nokia part suggests that it's related to a cell phone (perhaps some kind of car phone module?), but I certainly don't see anything like that in the car. The "digital sound processing" part suggests that it has something to do with how the car plays music. The car also has option 490 (Basic sound system) and option 688 (CD-radio Becker Porsche CDR-210 USA)—given that I only see a tape deck in the dash, I'm assuming 688 corresponds to the CD changer in the frunk. So the only thing that seems like it could be "digitally processing" would be CDs played by the CD changer. Was option 680 some sort of accessory module that allowed the tape deck to handle the digital sound information coming from the CD changer?

Subscribed My 99 has 680 and 490 but the po replaced the stereo with an aftermarket unit.

692 is the option for the CD Changer in the frunk. https://rennlist.com/forums/993-foru...tal-sound.html

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Do you still have the original system in your car? I believe this just means you have the DSP upgraded amplifier. The most common "HiFi" amp in 996 pre-MOST cars is the HAES or Nokia M490 amp, but the DSP option denotes the Nokia M680 amplifier. That's where the "680" comes from. Hope that helps.

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It looks pretty original to me: pTRKB3M.jpg 7l73WT8.jpg LzzQqjN.jpg hw8E1FO.jpg So is it this thing? tVsL9ve.png Or the thing in the dash at the bottom of the center stack?

One vote for the component at the bottom of the center console.

I have 680 and the same control unit at the bottom of my stack so that must be it. If I could I'd like to leave it on one setting and remove it for the center console delete but I have a feeling that will disable the whole sound system. '90's sound technology at it's best.

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Yeah, I plan to take the whole thing out and replace it with something that has Android Auto (like a Pioneer DMH-W4660NEX). After that, whatever it is will live in a box in my garage.

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That's the proprietary DSP equalizier with limited stereophonic sound effects (e.g. echo). I have the schematics for the DSP system, and it requires the use of the M680 amplifier. Although the system is marketed as digital processing, the system I/O is still very much analog from what I can tell. Not to be confused with more modern MOST-based systems that use fiber optics. btw... who in the world would ever want to use "ECHO" effect in a car? That would drive me bananas! The "POS" button tells it all! hahahaha

Here is the DSP diagram of parts...

So #5 is actually the 680? Amp that is?

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That is correct. #5 in the diagram is the DSP M680 amplifier. It's still for sale by Porsche too... only $672.35 (I think they should have rounded it up to $680... that would have made more sense. haha) https://www.porscheatlantaperimeterp...664531200.html

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Jesus. Pelican Parts has it for $800 ! If you're replacing the stereo with an aftermarket head unit, I assume you remove basically every part from that diagram.

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Yep, I would remove everything besides the wire harness. I wouldn't cut it. I would purchase an aftermarket harness to connect the aftermarket radio with the car's factory wiring. If you ever sell the car, it helps the sale if you don't cut any of the original factory wiring. Plus, I recommend keeping the original radio system for the next owner.

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When I finally get a stereo (which may have to wait until this whole global microchip shortage is over), I was going to order it from Crutchfield. It looks like their installation kit for a 1999 911 includes all of this stuff, which I assume is everything I'd need: Metra 99-9605B Dash Kit Metra 70-1787 Receiver Wiring Harness Metra 40-VW12 Antenna Adapter Metra 86-9001 Factory Radio Removal Tools Custom Instructions Interestingly, some of that stuff says "Boxster" on it, not 911, but I assume that they're interchangeable between the 986 and the 996. Oh, totally. That's why I was saying that it was going to live in a box in my garage. I don't know why anyone would ever want that tape deck and CD changer, but you know someone's going to.

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i have the same unit and wondered how I was going to deal w the GT3 delete (if I ever get around to it) somebody here suggested to keep the control unit plugged in, but to tuck it up and behind the delete panel. I never even turn mine on - after playing with it for about 5 minutes I hated every preset. unless you bypass the system altogether, the controller has to remain plugged in for the audio system to work.

Hi all, Has anyone ever had any success integrating a contemporary head unit into the factory HAES amp with the <enter preferred expletive> DSP interface (1999-996-C4 Cab)? I'm all for nostalgic interfaces with OEM badging, and I still own a comprehensive CD collection (for next decade's 'vinyl rebirth' when folks recall the better sound quality/range CDs offer over streaming media). However, my brand new (22 y.o.) 996-C4 cab has taunted me since purchase 6 weeks ago with a code-locked double-DIN PCM1, 6-stack CD changer and Navi unit. None of the traditional PCM code sources (including my indy mech pulling the code off the OBDII interface) could unlock the PCM to augment the purr of the engine with a little Pavarotti. Like the OP (and hundreds of other posts on various Porsche sites), I thought upgrading the head unit, and taking the nostalgic OEM interface hit to bring some technology into the cockpit would be a simple task. And a logical first step towards Utopia (a Porsche 911 stick shift on a mountain road without music being 90% of that journey). Many hours later, I'm still driving with a gaping hole in the center console, not wanting to permanently reinstall the carefully trimmed horseshoe — with its newly fitted Pioneer AVH-W4500NEX head unit — until I can get even a squeak through the AMP to the speakers. Hopefully any replies will also help the OP on his DSP journey... if DSP to HAES amp (via double or single Din factory PCM with/or without Nav) is simply impossible, because there is a proprietary PCM digital data stream that can't be replaced (or similar), Then what Amp(s) is(are) compatible to at least retain the factory low-impedance speakers (no 'dog' (woofer) in the back ? Thanks, Ian

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Awesome! I have a similar challenge to the OP. Are you able to advise what 'component 11' is, (from your diagram) and where it is located in the vehicle? Component locator I have a 1999 996-C4 with DDIN PCM1 Becker radio and Siemens navi unit combo. Like the OP, the amp (HAES) and CD changer are exactly as show in your diagram, (option 680 listed) and of course I'm getting no sound to the speakers from my new Pioneer head unit. I assume the PCM1 (now in a box) converts the signal to digital before sending it to the amp (or is the analog signal converted to digital at component #11 in your diagram?). There are two fat looms coming out of the Becker radio that don't figure in Crutchfield's simple wiring schema with their installation kit. I'm trying to establish if there is any hope of generating that DSP signal to recruit the existing factory amp and speakers with the Pioneer head unit (AVH-W4500NEX), or if the situation is hopeless! If it is hopeless, what amp (or amp specs) should I install that will work with the low-impedance factory speakers? Thanks in advance for any assistance you can provide, I've gone around in circles for a week on various sites trying to run this to ground, your name pops up regularly with sage advice.

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It is actually quite easy to replace the head unit and use the existing wires and harness. The exact same Nokia DSP amplifier unit and paired speakers were used in the mk4 Golf GTI with the CD changer option, like it or not. In the Golf, the Nokia DSP amp is in the rear trunk to the left just next to the CD changer, whereas in your Porsche it is in the forward frunk. Low signal comes from the radio to the separate DSP/Amplifier unit and speaker level signals are routed to speakers from there via the default harness. The default harness uses multiple conductors to supply the Amp with 12V power. As in the VW, the visible unit for the DSP Amplifier is only a simple switch to choose between different modes. To be fair there is only one. The extra effects are just "hey we can do this in the 90:s cool". The Nokia DSP Amplifier is a pretty decent piece of kit, especially as it comes with bespoke speakers and is calibrated with them. Replacement parts can be found in Europe quite cheaply, i.e. ~80 eur.

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DDIN PCM1 Upgrade Project in 1999 996 C4 Cabriolet Old PCM1 Head Unit with Nav (Becker/Siemens) PIN code locked with no known fix (within reasonable budget and schedule for 22 y.o. technology) The New Pioneer AVH-W4500NEX (If I Could Just Get Some Sound!!!) Do I dare to hope...? So many posts say that a modern head unit won't be compatible with the DSP amp. Are you implying that retaining the HAES DSP AMP is possible? (I am starting to look for a new amp that is compatible with the factory speakers) When you say 'separate', do you mean discrete components for DSP and Amplifier? I'm yet to find this 'DSP switch'. Maybe its a soft switch on the DDIN PCM that I've never cracked the PIN on. The million dollar question is how to wire this differently out of the head unit for a DSP amp other than the simple 2-chanels and a wakeup control wire that would normally go to the amp? I assume its not '3-Way Network Mode' out of my Pioneer head unit instead of 'Standard Mode' (I have no sub-woofer). Unlike the OP my 996 has no visible unit (hardware) DSP options on the face of the DDIN PCM1 with Nav (bummed that I don't have that ECHO button to hear what my Porsche would sound like without carpet )... No idea what user interface software options are present on the PCM as I've never gotten past the PIN code challenge. Is this the mysterious Part#11 from B3freak's DSP Parts Diagram. Keen to keep it, if I could just get this beastie working! My fear is that for my project, I might be dealing with an inoperable component somewhere in the sound system from the outset. The PO just pointed at the PIN challenge on the PCM screen at startup and said it had lost its code when the battery had died during storage, and that the PIN could be retrieved through a Porsche Dealer - yeah.. nope! Their code(s) didn't work, nor any of the others I sourced elsewhere.

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@Ian-99-996C4-Cab , Did you ever get your system working? It sounds like I am in exactly the same situation as you were in this thread. I have an aftermarket double-DIN that is mounted and ready to go, using the Metra 70-1787 wiring harness adapter, everything seems to work fine except...no sound at all. I've got PCM1, Option codes 490 and 680 but no DSP controller, just like you. I have gleaned from other threads that the "DSP-Receiver" (not the part with buttons in the cabin that others have) needs some signal from the PCM1 to operate. On the wiring diagram, I see two connections to the DSP Receiver that are not clear to me and could be part of the mystery- "data" and "Interrupt", pins 1 & 2. They connect to the amp. I wonder if one or both want +12v, GND, or something else to make the amp turn on and do its job. The threads I am seeing where others went through this ended up with a replacement amp and dealing with the low impedance speakers. It would be nice to not have to do that. I wonder has anyone gotten something to work? Apparently there is some configuration that allows a simple plug and play, even with the PCM1, as a lot of people say something like "What's the big deal, I just plugged mine in and it worked." I believe it is when option M490 exists, but M680 is absent. Seems like that was a viable combination of factory options even with PCM1. Wiring on the head unit: Wiring diagram:

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Well searching deeper and looking at what some of the guys who are putting in PCCM+ are running into solved my problem. My guess above was right, pin 17 on the amp side of the DSP Receiver cable needs to be grounded ("DSP Data" in the wiring schematic). There's apparently a Porsche TSB on this laying it out and also describing a grounding wire harness that is used on the 18 pin connector. I made my own. Once I did that, the amp turned on with the radio and I had sound. Excellent! My homemade ground wire to go into the pin 17 spot on the amp connector: The new grounding wire in the connector in pin 17 location. Also visible is the black/red/yellow wire that is the "DSP Data" signal from the amp, which was previously in pin 17 and I snipped: The plug and new ground wire on the ground location adjacent to the amp: : Sorry for the thread hijack, but I wanted to resolved my own question. Hopefully useful for those having the same issue. Edit: Here's the key post from b3freak that got me over dead center, regarding the Porsche TSB for the PCCM+, section 6.5.2: https://rennlist.com/forums/996-foru...l#post16976151 If you want the Porsche part for the ground wire (I wouldn't see why, it's very simple to make one yourself): 996.642.585.00

@ChuckUFarley What model of Sony is that with the volume ****? None of the ones I've been able to find have a volume ****.

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It's the XAV-AX1000. I bought it mostly because of the ****! CarPlay too.

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It's the XAV-AX1000. I bought it mostly because of the ****! CarPlay too.

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Looks like it's been discontinued and doesn't support Android Auto. Damn. Ah, well. The hunt continues.

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That's weird, I just bought it a couple of weeks ago at Best Buy. Maybe the last of the inventory? Might be worth checking.

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Well done on solving the DSP issue! I ended up replacing the factory (Nokia) amp with a new Alpine amp and this solved the DSP no sound problem. Your solution sounds far simpler and more elegant.

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How could you tell which one was the right cable? They don't seem to be labeled and that linked thread makes it rather ambiguous how you differentiate them. Your pictures didn't load. You could try putting them on imgur instead of Google. Based upon the previous thread that you linked to, I assumed that it was the green and dark red cable. Specifically, this one: qEO1pcC.jpeg But we cut and grounded that one and still couldn't get any sound. Video details .

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Not sure why the photos aren't showing up for you, I paste them into the post from my computer. Not google. How could you tell which one was the right cable? They don't seem to be labeled and that linked thread makes it rather ambiguous how you differentiate them. That doesn't look like the correct wire, should be Pin 17 on the black connector on the amp, in the frunk on the passenger side like it says in the Tech Bulletin, Section 6.5.2, Page 9. Its labeled "DSP DATA" on the schematics in the thread. Not the larger green connector, the smaller black one. The wire color is black/red/yellow, shown here after I snipped it...the colors aren't what I would call vivid or obvious: The output of the Sony is either higher power direct to speaker output on the violet/green color set wires (you don't want this if you use the amp), or pre-amp output through the RCA (this is what you should use with the amp). I think your lack of audio problem is that you got the wrong wire grounded. I bet once you fix that it will work.

Interestingly, I think my connector is numbered differently than yours. The color on what seems to correspond to number 17 is white with a green tracer. I wonder if it's just supposed to be number 17 regardless of color.

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Could be, in fact that's what is shown on the schematic and confused me too. Amplifier side of the wire, pin 17. Wonder if there's a model year change somewhere in there. I think the goal is to ground the DSP Data input so the amp has the signal to turn on.

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You had it! Turns out, you need to cut-and-ground wire 17, regardless of its color! Thanks!

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That's great, glad it worked. Feels good to be un-stuck, right?

The most common "HiFi" amp in 996 pre-MOST cars is the HAES or Speed Test Nokia M490 amp, but the DSP option denotes the Nokia M680 amplifier. That's where the "680" comes from.

FWIW I have the CD player/changer/amp/DSP option 680 in my '99. I replaced the HU with a Pioneer unit w/ wireless CarPlay about a year and a half ago. What you need to do to just replace the HU is to keep the amp and the DSP controller installed. You can turn all the DSP effects off, wrap it in something and place it somewhere out of sight. You just need to keep it wired up to the amp. One problem I had - Siri and phone calls had a bad "in a cave" echo effect. I found out that one of the DSP buttons had been hit. Once I turned it off it sounded normal again. If you want to replace the amp too, then you can get rid of the DSP control unit.

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my car was missing the amp. I checked with Porsche and the original one was the Nokia 6 by 40. I got a use one from Los Angeles auto dismantlers (LAD) probably the largest 996 cemetery. Got an awesome deal $60 shipped to me. My 6 cd changer wasn�t in the car. I have the CDR 220 radio so if I want to play a cd I can do it with the existing radio.

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Sorry to resurrect an old thread. I am in the process of grounding my amp just as above in your post but I cannot find new terminals to put into the connector. Do you happen to know the type or size? Mine is also green with white on the wire. Thanks

Many thanks for the post and pictures. Am having a 996 with PCM1, Haes (option 680) Amplifier and CD Changer. Installed a Sadocom Android Radio and just couldn't get any sound out of it. Cutting the wire in the picture (Black/brown with greenish rings) and connecting it to the nearby ground fully fixed the problem, sound on all speakers now!