It switches mechanically. The Jaycar one I showed the link to is a PCB mount, but this shouldn't be a problem as it has the front bezel which means it can be chassis mounted.

In theory you probably could do this for any head unit with a stacker, but you would need to chase down the pin configs yourself to work out which wires to cut into.

The exception here would be if some stackers sent the signal as a digital stream to the head unit and then the head unit decoded it, but I wouldn't imagine manufacturer's taking this path???

Can it be done for the mid-series stereo system? Also, can you run more speaker wires into the factory looms and put more speaker elements on the rear shelf, or tweeters mounted in the top of the front door?

This is great; makes me miss my old Premo Sound HU lol.

Was a good unit, and with AUX input, ud be laughing.

Great work, tech doco on the way i hope.

camh1980 ... such a mod may be possible for the mid-series stereo system if it includes a boot-mounted stacker. You would have to do it all from scratch though as I don't have any details on the pin config for a mid-series (no DSP) where the stacker plugs into the head unit.

If you have a stacker with a plug that looks the same as I have shown, though, this would make things significantly easier. What you would have to do is to remove the HU and work out which plug has the same number of wires and same colour scheme as those leading to the plug that connects to the stacker. If you could isolate what you *thought* were the same wires at the HU end, then it would be simple to use a multimeter to check continuity between the pins at each end, confirming that you had the right wires. As soon as you had located the right channel, left channel and signal ground wires, then the rest of the mod would be as per my description.

i can confirm that this works with the mid series...

hey moph, when you do this, does your volume seem to decrease...i find that if i just have the sound coming from the stacker that its heaps louder than if i have my mp3 player plugged in at the same time...
would using the switched C**k fix this problem?
cheers,
mitch

mitch_anderson, I'm not sure whether you mean that (1) for a set volume control position on the HU, the CD stacker is louder than the MP3 player; or (2) when listening to CDs via the stacker but with the MP3 player plugged in and switched off, the CD volume is very quiet.

In answer to point (1), don't forget that the stacker outputs at a set volume level, whereas your MP3 player headphone jack is variable level. I set my MP3 player at full volume, and this gives similar volume to the stacker.

For example, if you had a test CD that played one note at a constant volume, and tried playing it via the stacker and then from your MP3 player, the stacker would output a set 'reference' voltage that corresponded to that volume, and the deck would then amplify it. If this reference voltage was (say) 4V, but then your MP3 player outputs the same note at 3V, then the MP3 player would be noticeably quieter. On my MP3 player I am able to use the volume control to get the MP3 player output voltage very similar to the stacker 'reference' voltage, but this is MP3 player dependant.

To answer point (2), then yes I have noticed that when listening to CDs via the stacker but with the MP3 player plugged in and switched off, the CD volume is very quiet. This is something to do with the way that the new auxiliary in changes the impedence of the line in from the stacker. Changing to a switched socket would certainly fix it, or you can just unplug the stereo lead from the auxiliary socket. I will be changing mine over to switched socket now that the Jaycar ones are back in stock. Just need some time to do it

Hope this answers your question! Either way, the switched socket is by far the most elegant and complete solution.

Cheers,
Tim

d**k have these ones... same thing?

http://www.dse.com.au/cgi-bin/dse.store ... View/P1245

Not sure sorry, Happy, 'cos I get confused by the whole SPST terminology when it comes to stereo sockets. They're not as plain and simple as normal switches and relays!

The sure way to know: if you go to DSE to look at it and it has only 3 solder pins, then its a non-switched plug (non-prefereable). If it has five solder pins, then its a switched plug.

now for sum1 to do it for the bas....

and also how to get to the dam stereo.

yes that answers my question...now to go and do this on my fairmont...
thanks for the guide mate...you are a champ!

yeah I went and had a look and only three plugs ... did you get the ones from jaycar ?

Have got the switched plug from jaycar this morining, but am confused as to how to wire this in, saw your pic, can you please axplain how the switched plug is wired. I know i seem simple but hey, too much NOS lol
Brett

Ok My bad, i had another look and i take it you cut the right output from the stacker, and tis is also the input to the DPS, same with the Left output, and the common is just spliced in
Brett

Yahoo ... just done this mod for the EF premo sound, awesome results. will take some pics then we'll put a complete doco together to help others!!

Now I can plug in my iRiver and get great sound!!