Discovery 2stereo upgrade

[Tillytomp]

Hi guy, after much serching and not being able to find relevent infomation, i keep coming across this site and hopefully you can help me. I know this has been dealt with before but you guys are my last hope
I have a landrover discovery 2 1998 ES with the Harmom Kardon high stereo, i have replaced the stereo with a "kenwood kdc-x7000dab"
Now everything works, stalk controls ect ect, but i dont think it sounds as good as it should.
this is the wires that im using "https://incartec.co.uk/landrover/1343/1033/2047/165/Browser.aspx"
The problem i have is there is a hissing coming from the speakers, wasnt there before the HU swap.
I have turned all the gains down on the amplifier integration interface, and whilst its still there its barely noticable.
But if i remove the amplifier integration interface wiring it sounds so much better and how i would expect it to,:D but the hissing is terrible.

Every time I try and investigate this I come across this website and this thread,

http://www.aulro.com/afvb/discovery-2/141377-d2-es-high-line-system-hk-11-speaker-head-unit-replacement.html
Which seems to suggest the the RCAs connect to the C0092 connection plug,

Please can someone help me, otherwise I will have to go to an expert and admit defeat :eek:

BTW I'm in the UK

Cheers Neil

[laney]

Most amps have an earth loop in them if you have put youth RCA plugs in the wrong connections this will destroy the earth loop and give you a whine or a hissing noise from your speakers. If you have fitted every thing correctly then you can get from a good auto electrician a noise reducer that plugs between the amp and radio hope this helps.

[northiam]

The factory amp connects to the RCA pre-outs at the new HU via the C0092. Dont use the new HU speaker outputs:)

[singlecell]

The factory amp connects to the RCA pre-outs at the new HU via the C0092. Dont use the new HU speaker outputs:)

Have you done this? I only ask as when I fitted a new head unit it looked to me the factory amp ran from the high level outputs of the stock head unit. So I connected the new head units speaker outputs to the amp. It's been running like that for a couple of years now.

[singlecell]

Ok. So I looked at the link and its your post. Haha. Clearly you did. Interesting mine works without issue though....

[northiam]

I did originally try the high level/speaker outputs to connect the amp and found really muffulled sound. Then tried the RCA outputs .
The lower voltage of the low level(RCA) outputs should make the any humming less likely?
May be yours would sound even better with the low level outputs?

High-Level V.S. Low-Level Inputs | Learning Center | Sonic Electronix (http://knowledge.sonicelectronix.com/car-audio-and-video/car-amplifiers/high-level-v-s-low-level-inputs/)

[geordiepride]

any audio leads running next to a power cables will cause interference

or the stock amplifier doesn't have any filters

[Tillytomp]

firstly thanks for the replys guys, this is far more help than ive had on this issue

The factory amp connects to the RCA pre-outs at the new HU via the C0092. Dont use the new HU speaker outputs:)
how did you do this, RCA to C0092, i have serched the net and cant find anything that would do this??


I did originally try the high level/speaker outputs to connect the amp and found really muffulled sound. Then tried the RCA outputs .
The higher voltage of the low level(RCA) outputs should make the any humming less likely.
May be yours would sound even better with the low level outputs?

High-Level V.S. Low-Level Inputs | Learning Center | Sonic Electronix (http://knowledge.sonicelectronix.com/car-audio-and-video/car-amplifiers/high-level-v-s-low-level-inputs/)
yeah mine is a bit muffled, just doesent sound quite right


any audio leads running next to a power cables will cause interference

or the stock amplifier doesn't have any filters
im using the standard Land rover loom so i dont know if there are any filters or not

[Tillytomp]

this is hows it wired at the moment

[Tillytomp]

The factory amp connects to the RCA pre-outs at the new HU via the C0092. Dont use the new HU speaker outputs:)

Right, i get it now, Now that ive joined i can see your pictures, did you make that adaptor, RCA to C0092.

[Tillytomp]

i guess this would work??

FUSION CA-HIC13 HIGH LEVEL INPUT CABLE RCA TO SPEAKER WIRE EN-1502 EN-3004 | eBay (http://www.ebay.co.uk/itm/FUSION-CA-HIC13-HIGH-LEVEL-INPUT-CABLE-RCA-TO-SPEAKER-WIRE-EN-1502-EN-3004-/171103152709?hash=item27d68aea45:g:tmkAAOxyaoFSFJA m)

[Tillytomp]

Or is this better
PC3-09 LANDROVER ALL MODELS 10 WAY FEMALE ISO TO RCA MALE HARNESS ADAPTOR LEAD (http://www.ebay.co.uk/itm/PC3-09-LANDROVER-ALL-MODELS-10-WAY-FEMALE-ISO-TO-RCA-MALE-HARNESS-ADAPTOR-LEAD-/360580905513)

[Pedro_The_Swift]

maybe this
http://www.aulro.com/afvb/local_links.php?catid=2

[Tillytomp]

Thanks Pedro for the link, some interesting reading, and the same stereo :cool: but not quite what I was after I don't think:) unless I missed something

[northiam]

Or is this better
PC3-09 LANDROVER ALL MODELS 10 WAY FEMALE ISO TO RCA MALE HARNESS ADAPTOR LEAD (http://www.ebay.co.uk/itm/PC3-09-LANDROVER-ALL-MODELS-10-WAY-FEMALE-ISO-TO-RCA-MALE-HARNESS-ADAPTOR-LEAD-/360580905513)

This appears to be correct

That blue box contraption in your pic would then be unnecessary

[Tillytomp]

Ok, cheers I will order one up and see what happens, not sure when I'm going to do it though as got to give back a mk1 disco we were using, so this will be my missus main ride now grrrr

[Tillytomp]

I think in one of the links given it said when you have 3 RCAs one can be used to power an amp for the /a sub, is this the case.
If so what sort of amp whould I have to get (sorry for the noob questions) just something simply

Many thanks neil

[singlecell]

I did originally try the high level/speaker outputs to connect the amp and found really muffulled sound. Then tried the RCA outputs .
The lower voltage of the low level(RCA) outputs should make the any humming less likely?
May be yours would sound even better with the low level outputs?

High-Level V.S. Low-Level Inputs | Learning Center | Sonic Electronix (http://knowledge.sonicelectronix.com/car-audio-and-video/car-amplifiers/high-level-v-s-low-level-inputs/)

Well I might make up a harness and give it a shot. Can't hurt to try and see what its like.

[geordiepride]

you will probly find the stock amplifier is designed to receive a 1 or 2 volt input and most likely
running 20 watts per channel and it doesn't have the filters to see the higher voltage ..( cant process the information clearly )

depending on you head unit the RCA pre outs should be between 4 and 6 to 8 volts but depends on your head unit specs RCA outputs

I would delete the stock amplifier if your radio is 40 to 55 or 60 watts per channel

other words

you are using a high power amplifier to control a smaller lower power amplifier

[northiam]

you will probly find the stock amplifier is designed to receive a 1 or 2 volt input and most likely
running 20 watts per channel and it doesn't have the filters to see the higher voltage ..( cant process the information clearly )

depending on you head unit the RCA pre outs should be between 4 and 6 to 8 volts but depends on your head unit specs RCA outputs

I would delete the stock amplifier if your radio is 40 to 55 or 60 watts per channel

other words

you are using a high power amplifier to control a smaller lower power amplifier

The ES/HSE sound systems have 12 speakers in total with 4 speaker/subs rated at 30watt rms, 8 rated at 15watt

A typical 52wattx4 rms (peak) head unit would struggle to drive them without an amp.

[geordiepride]

The ES/HSE sound systems have 12 speakers in total with 4 speaker/subs rated at 30watt rms, 8 rated at 15watt

A typical 52wattx4 rms (peak) head unit would struggle to drive them without an amp.

totally agree but if the stock amplifier isn't designed to see a higher voltage then what ?

we would also need to consider how are the speakers wired series parallel ?

ohm load are they 1 /2/3/4/8 ohms speakers ?

pretty easy to wire 4 speakers together and keep the correct ohm load

[northiam]

totally agree but if the stock amplifier isn't designed to see a higher voltage then what ?

we would also need to consider how are the speakers wired series parallel ?

ohm load are they 1 /2/3/4/8 ohms speakers ?

pretty easy to wire 4 speakers together and keep the correct ohm load

My Alpine HU is 4 volt pre outs runs loud and clear.
Alpine Electronics of Australia (http://www.alpine.com.au/showItem.php?item_id=322)


The channels are paralleled where split

4 ohms I seem to recall maybe

No doubt replacing all the speakers, wiring and amp when changing out the head unit with modern quality gear would great but what a cost...

[Tillytomp]

Thanks for the advice Guys its really appricated.
im not going to install new amps or speakers,as i dont want to spend that sort of money on this car, so either RCAs will work or not, i will just revert to what i have now :D

i have ordered the RCA to ISO connetor so will shall see...

[geordiepride]

My Alpine HU is 4 volt pre outs runs loud and clear.
Alpine Electronics of Australia (http://www.alpine.com.au/showItem.php?item_id=322)


The channels are paralleled where split

4 ohms I seem to recall maybe

No doubt replacing all the speakers, wiring and amp when changing out the head unit with modern quality gear would great but what a cost...

every thing comes at a cost just like some people will spend 300 /500 1000 dollars on a head unit but use the factory hardware system ?

a good head unit will play allot more frequencies than a stock unit
stock speakers will have a curtain frequency response

maybe your loud and clear is different to my loud and clear
but there is no need to spend lots of money

most cheap amplifiers and speaker splits are dead cheap cheaper brands ...and they pruduce more power and clearer than a stock system ..also they will play longer at higher listening levels with out going into limp mode or cutting out

[Tillytomp]

Hi guys, right update the new bit of loom has turned up and i was hoping that it was " pre wired" but its not, this is what i have https://mail.google.com/mail/u/0/?ui=2&ik=e9d89c7494&view=fimg&th=156bd71d80d81573&attid=0.1&disp=inline&realattid=1543563650379284480-local0&safe=1&attbid=ANGjdJ_SMJhU71edpl0wLo_GU2UeWfIpAw5wixUiE8e obBHiZ9iOGJ1CB8jYPiQj7kNN1t2jBr3P_Mk3r73tHdB59Owrn a-bH09lEzQE5e0ajSd1E_Ujp_NQdJhgQw0&ats=1472057237378&rm=156bd71d80d81573&zw&sz=w1366-h635

[Tillytomp]

I guess i need whats in the background of thihttp://www.aulro.com/afvb/attachments/discovery-2/42001d1325069864-d2-es-high-line-system-hk-11-speaker-head-unit-replacement-au.jpgs photo:confused:

[Tillytomp]

Hi guys, I had a bit of a play with the stereo this morning, and tried to work out the wiring, do the black wires coming from the RCAs need grounding?

[Tillytomp]

Anyone :(

[Rok_Dr]

If you are referring to the wires with a black trace that go to the Rca plug from the iso connector they will be the audio negatives and from memory are soldered to the shield. The positive wire is connected is to the pin.

Cheers

Steve

[Tillytomp]

Thanks for the reply Steve, OK I now understand that bit, :) but there is also 2 solid black wire, so 5 wires per set of RCAs, if that makes sense :confused:

[Rok_Dr]

A good question and unfortunately I don't have an answer to that. A couple of thoughts though.

It may be time to find an electrical schematic for the vehicle and work out what wire colours do what. For my discovery it was pretty simple as it was low spec system without an amp, so it was iso standard. A bit of googling may turn up the electrical library manual and you can always buy the rave cd with it here.

Secondly in my experience black wires are usually negative and for a negative earth vehicle this translates to ground.

Cheers

Steve

[Tillytomp]

I email the guy i got the wiring from and that correct, the solid black wires go to grd.
Now for the rest.........

[northiam]

http://www.caraudiodirect.co.uk/install-adaptors/land-rover/autoleads-pc3-09-10-way-female-iso-rca-male-kit


It seems your adapter harness is supplied with the wires not in the socket
Leave the black wires out and connect wires as per rave manual C0092 diagram