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<!-- google_ad_section_start -->Adding A Pre-Out RCA Connection<!-- google_ad_section_end -->
Adding A Pre-Out RCA Connection
With or without an exisiting factory sub.
Published by captain chaos
04-09-2007
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Adding A Pre-Out RCA Connection

This guide explains how to use your existing (If you have a factory sub) subs wiring loom, to add a pre-amp RCA connection.

If you dont have an exisiting sub you can use your rear speakers connection by either taking the car to bits to get to the speakers directly, or from the back of the head unit its self.

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From the above diagram split into the appropriate rear speaker feeds and run a line to the rear of the car.

However for the rest of the guide we will assume that you are replacing the factory sub.

Remove the factory sub by removing the three 5mm torque screws holding the sub in place.

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When the AMP is free remove the white plastic block connector from the rear and remove the AMP.

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With the AMP removed You can now examine the block connector.

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The pins of this connector are as follows:---

Code:-

1 3 4 5 7
+------+----+
|0 0 0 | 0 0 |
|0 +---+ 0 0 |
+--+---+----+
2 6 8

1. Remote 12V+ switched (grey)
2. Continuous 12V+ (red/white)
3. Ground (-) (black)
4. not connected
5. Speaker right - (blue/black)
6. Speaker right + (blue/red)
7. Speaker left - (orange/black)
8. Speaker left + (red/grey)

Using the following addaptor or similar, splice into the left and right speaker feeds and the ground wires. Once completed you should mask off the wires to avoid shorts.

I have also reconnected the plugs original connections to allow me to reconnect the original at a later date, should I decide to sell the car.

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http://www.motor-world.co.uk/show_pr...?prod_id=12916

You should now have a fully working pre-amp connection to use with your amplifier.

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Old 08-09-2007   #1
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Re: Adding A Pre-Out RCA Connection

Nice to see my howto was of any use to you!

I didn't know of the existence of such a passive speaker to line-level convertor. I once bought an active one (which needs 12V as well) for around 14 euros, which also had adjustable input sensitivity. I bought it before I knew the amp I bought supported speaker-level input as well...

Nice howto!

Kind regards,
Michel
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Old 03-02-2008   #2
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Re: Adding A Pre-Out RCA Connection

does every gp have the wiering to the back as iv run wires from my new head unit to amp already
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Old 22-04-2009   #3
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Re: Adding A Pre-Out RCA Connection

good guide, however do you use the switched power from the original sub to the remote on input on the amp?
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Old 22-04-2009   #4
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Re: Adding A Pre-Out RCA Connection

Quote Quote:
Using the following addaptor or similar, splice into the left and right speaker feeds and the ground wires.
and whats the benefeit of connecting the ground wire? not entirely sure how you would connect this to the adapter?
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Old 29-05-2009   #5
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Re: Adding A Pre-Out RCA Connection

But if i'm right this isn't actually a pre-out, this is a high power supply and connecting this into a normal phono in on an amp would cause some damage!

this should only be used if you have an amp with a high level input

however after trawling FF for the info on how to wire an actual pre out and having no luck, i've managed to find a pin list for blaupunkt head unit

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1 Pre Out Rear Left
2 Pre Out Rear Right
3 Pre Out Ground
4 Pre Out Front Left
5 Pre Out Front Right
6 Amp Switch +12v
7 Telephone In +
8 Telephone In -
9 Radio Mute
10 Switch Supply +12v
11 Remote Control
12 RC Ground
13 Cd Changer Data In
14 Cd Changer Data Out
15 Permanent 12v
16 Switched 12v
17 Bus Ground
18 Aux In Ground
19 Aux In Left
20 Aux In Right

Hope this helps everyone
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Old 07-06-2009   #6
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Re: Adding A Pre-Out RCA Connection

Hey,
I have a 58 plate 5 door sporting 120 tjet with the additional subwoofer, blue&me etc and want to upgrade my sound system with a sub and amp. is the above method (using the existing sub wiring) the best way to connect teh sub/amp as apposed to running new wiring from the HU? I have no idea about wiring or car modifications so am a compelte newbie. Also could someone re-link to that adapter as it seems to be broken. I did have a look around the net for a diff one and found a few but I have no idea if they are the same thing. Are all fiat grande punto standard cd players made by Blaupunkt? Any help is much appreciated!
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Old 07-06-2009   #7
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Re: Adding A Pre-Out RCA Connection

Also how do you connect the power to the new amp?
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Old 23-10-2009   #8
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Re: Adding A Pre-Out RCA Connection

Hey i have a 07 plate sporting mjet 130bhp.the rear speakers are behind the drivers seat is there any way of wiring a sub to the existing speaker wiring??
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Old 18-11-2009   #9
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Re: Adding A Pre-Out RCA Connection

Hi,

Ive an 2007 Grande Punto 1.3 Mjet with blue&me but whithout a factory sub.

Does anyone now if the factory radio has a way to connect an amplifier?

Does it has any exit that I can use to connect an amplifier?

Regards,

Alpinev12
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Old 31-01-2011   #10
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Re: Adding A Pre-Out RCA Connection

This is not a pre amp feed!!! This could damage your amp in theory, as this method is a speaker level feed. This can be proved by connecting a speaker up to pins 5 and 7 or 6 and 8, if you get sound, you have an amped speaker level feed. I tried this yesterday and got sound from the speaker.
You need to use a level line converter that takes high level input and converts it to a pre amped low level RCA connection.

As for DannyBoy88's post, this only applies to aftermarket Blaupunkt headunits and not the factory fit product.
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Old 27-12-2011   #11
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Re: Adding A Pre-Out RCA Connection

I dont have the feed for the stock speaker in the back and I am wishing to install a JBL bass pro just to provide a bit of bass. Do i take a feed off only one speaker for the Phono connections or both. Iam assuming just one. Ill probably replace the rear speakers whilst Iam at it seen as changing the front one did the world of difference.
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Old 27-12-2012   #12
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Re: Adding A Pre-Out RCA Connection

Quote Originally Posted by DannyBoy88 View Post
however after trawling FF for the info on how to wire an actual pre out and having no luck, i've managed to find a pin list for blaupunkt head unit

Attachment 63930


1 Pre Out Rear Left
2 Pre Out Rear Right
3 Pre Out Ground
4 Pre Out Front Left
5 Pre Out Front Right
6 Amp Switch +12v

Hope this helps everyone
You mean these ISO pins can be used to get perfect PREOUTs, after adding that adapter you have shown.
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Old 12-06-2013   #13
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Re: Adding A Pre-Out RCA Connection

OK... prob some clarity needed here...

For units without the stock sub installed, there are these unused pins on the back of the stock HU...
Am I right in saying that the only way someone without the stock subwoofer to install an aftermarket subwoofer is by splicing into the rear speaker connections and not use any of this unused pins
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Old 14-06-2013   #14
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Re: Adding A Pre-Out RCA Connection

Quote Originally Posted by Montypaks View Post
OK... prob some clarity needed here...

For units without the stock sub installed, there are these unused pins on the back of the stock HU...
Am I right in saying that the only way someone without the stock subwoofer to install an aftermarket subwoofer is by splicing into the rear speaker connections and not use any of this unused pins
This is correct, the RCA line-level converter is attached to the rear speaker cables, i have had one of these before and although it adds extra boom to your sound, due to it running off the speaker signal the sub woofer quality is kinda bad. I have recently upgraded my stereo to have sub woofer pre-outs and a high pass filter making the speakers sound better with no distortion as they are stock speakers and giving the sub woofer cleaner bass at higher volumes.

If your after a cheap way to add bass then an RCA Line-level converter is just what you need however if you can afford it get yourself an aftermarket stereo

Hope this helps
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