What is this

It looks like a crossover to me. It's used to issolate the hight and low frequencies and send them to the specific speakers. You wire the feed from the stereo to the "IN+" and "IN-", then you'd wire "TW+" and "TW-" to the tweeter, and "WF+" and "WF-" to the woofer (in this case likely the normal door speaker).

I'm not 100% as to what the "0dB" and "-3dB" terminals are for though.

Ah, in that case I'd be guessing that 0dB and -3dB are the tweeters positive feed, but provide 2 different volume levels for it, so you can tune it to match your woofers. Not 100% on that, but it would certainly make sense.

Robin is spot on.

It's a passive crossover for the tweeters (TW) and midrange (WF). The 0dB and -3dB will give two different volume ranges to match whatever midrange you use. -3dB will give a slightly quieter tweeter than the 0dB.

Once you've got your speakers installed, try both settings to see which one you prefer the sound of. If the tweeters are further away from you than the midrange you might want 0dB, if they are at a similar distance or closer than the midrange I would keep them as -3dB.

Good luck with the install.

yeah the 2 wires to the existing speaker go on the input side of it

I will rip out the radio in the morning but it is a Sony cdx gt616u but i can tell you what wires are and there colour and what they do

Blue/white = Amp Rem
Light Blue = ATT
Yellow = Continuous power
Blue = Power aerial control
Orange/White = switch illumination power supply
Red = Power switch supply
Black = Ground
there is an audio out front and rear and a audio in

This is the amp


This are the speakers
2 of all of them



And then the tweeter and the cross over also the 2 sub
There all going in the camper van up front in the cab area

Sorry here is the other end

As Mr Akku says, the amp is a monoblock amp which is used to drive bass speakers (your pair of subs)

Basically, you will have to lose one pair of speakers with the current set-up you've got. I would lose the Sony X-plod speakers and concentrate on the tweeters & Pioneer ones 'up front', the 6x9's behind and the subs for some good bass.

With only one amp, and with it being a monoblock (non-stereo), then this will drive the pair of JL subs which you will be best fitting into some kind of enclosure (a bass box) to get the best out of them. JL Audio is a good make, so you're off to a good start there.

For the other speakers you'd ideally want to alto run them off another amplifier, but for now you'll have to run them off the amplifier built into the head unit. This will give you the sound but won't be as good as running them off a seperate amp.

On the back of the head unit you'll have 8 speaker wires to run four four speakers. There will be a pair of wires for each speaker.

You need to establish which wire does what, there will be a front left pair of wires (FL) front right pair (FR) a rear left pair (RL) and a rear right pair (RR) with a + & - for each speaker.

Mount the 6x9's somewhere behind the front seats and run the RL & RR speaker wires to those. Then mount the tweeters and Pioneer speakers up front (either in the doors or the dashboard) then run the FL & FR wires to the IN+ and IN- terminals on the crossover units (one left and one right)

Once you've done that, you want to run WF+ & WF- from each crossover to the corresponding left & right Pioneer then the -3dB & TW- to the corresponding left & right tweeters.

It is important on each pair of speaker wires that you work out which one is + and which one is - and carefully make sure you wire each speaker in the system to the matching + & - wire otherwise it'll sound awful.

Using the shortened terms I've mentioned above, you should wire the four speakers from the head unit like this:

RL+ to the + on the left hand 6x9
RL- to the - on the left hand 6x9
RR+ to the + on the right hand 6x9
RR- to the - on the right hand 6x9

FL+ to the IN+ on the left crossover
FL- to the IN- on the left crossover
WF+ to the + on the left Pioneer
WF- to the - on the left Pioneer
-3dB to the + on the left tweeter
TW- to the - on the left tweeter

FR+ to the IN+ on the right crossover
FR- to the IN- on the right crossover
WF+ to the + on the right Pioneer
WF- to the - on the right Pioneer
-3dB to the + on the right tweeter
TW- to the - on the right tweeter

For the amp, you will need to fit an RCA (Phono) cable from the RCA output on the back of the head unit (if there are three RCA's then you want the one that isn't labelled front or rear...it might be called 'LOW' or 'BASS' or 'SUB' etc...) If there are only two RCA outputs you want to use the one labelled REAR

Run this to the CH1 (left) and CH2 (right) inputs on the amp then run one + and one - wire to each sub. You want to avoid running the RCA cable near any 12V cables where possible (ideally, run the RCA away from all other cables) to avoid interference.

Earth the amp really well as close to the amp as possible then run the +12v cable from the battery with a heavy cable and good fuse right next to the battery. There will also be a blue wire from the back of the head unit (should be labelled 'ACC') which you need to run from the head unit to the 'ACC' terminal on the amp. This switches the amp on/off when you turn the head unit on and off. DO NOT run this to a permanent +12v feed of you'll drain the battery very quickly.

That should get you started. Try to use reasonable quality speaker cable to improve the sound, especially where the speakers are a long way from the head unit.

If you get stuck, give me a shout and I'll see what I can do to help.

Thanks a million this is going to help me alot i now don't feel so scared to wire it up now
i will start making my bass box in a week or so and collect all the parts to wire it all up

Thanks this is the main reason i joined this forum so many people willing to help out