new system, new problems ( babble)

[fred sonnen]

I'm rebuilding my stereo.
Maybe someone is interested, or I can take one or the other tip.

Present were:
"Exposure XV" integrated Amplifier
"Arcam CD 8 se" player. Associated with generic silver RCA cables.
Kenwood tuner cheapest RCA cable ...
I am using the "LUA 5/3" pretty sensitive speakers.
Associated with LUA coaxial speaker cable. (250pF, 220nH per meter)

----------------------------------------

By coincidence I've come to a power amp Exposure XVIII-super
A Exposure XVII preamp I could buy favourable. including exposure XLR Cable
The pre-and PowAmp I gave to service: recapping
I had a faint noise in the XV. I think it is Exposure inherently.
Unfortunately, this is at the XVII-XVIII + s become louder. In addition, there was a faint hum.
I then provided all the cables with a sheath-flow filter.
No effect.

-------------------------------

Since the XLR connector with 3 wires were soldered to pin 2, I have replaced piece by piece all the cables.
XLR connector: Neutrik NC3xXX with Morgami 2534 Series Quad Cable
-> At the noise, nothing has changed.

Next, I replaced the RCA connections.
Neutrik NF2CB2 with Klotz AC110 cable -> Rega Couple clone
Neutrik NF2CB2 with Klotz MC5000. A stereo cable with heavy shielding. I had read in a forum of the following construction:
The stereo cables connectet as usual to the RCA connectors.
In addition, connect the shielding on the source side directly to the RCA.
The shield on the amplifier side with a 100 ohm resistor connected to the RCA.
-> At the noise, nothing has changed.
-------------------------------

The next thing I will change is the power supply.
Exposure has fixed standard power cables.
Of these I will replace the external part to double-shielded power cable.
The connection between internal and external will be made via Neutrik NAC3 Powercon connection.

BTW: Neutrik makes really cool stuff!

I think I will again replace the power strip. But I know not whether I still integrate a network filter.

what do you think?

My thought about better sq will follow later.
----------
regards
f.s.

[earlofsodbury]

Welcome to the 'Wam Fred. How about some pictures of your system/s?

Perhaps a fuller description of the noise you are experiencing will help people make an informed contribution.

[stewartwen]

Diagnosing a Fault, remotely, is very very difficult. Almost impossible for me to recommend any course of action. If you put your location in your profile, maybe some kind, experienced Wammer can come round and help you to identify the source of the problem. BTW welcome to the WAM.
S

[fred sonnen]

Thanks for your welcome!
Within the next days i will fill my profile.
but, this is a British forum (?) and I think just a few of the members are living in germany as I

iwill try to describe the babble later on.
----
regards
f.s.

[earlofsodbury]

Fred - it's an international forum based in the UK, we have members all over the world.

[rabski]

Fred - it's an international forum based in the UK, we have members all over the world.

Yeah. Plus a few who live in a different universe.

Fred, I got a bit lost with what you actually now have. Could you list the complete current system and (as Paul suggested) try and describe the 'noise'? Is it just a low-level hum?

[fred sonnen]

... Is it just a low-level hum?

If you mean it is not load, then you are right.

Because of the Exposure non feedback design I guess I must live with the noise.
But hum I will not except.

my complete hifi equipment is powered via one grid bar.
on the top of the rack I have an Exposure 17 PreAmp
below a Arcam alpha cd 8-se
below a kenwood tuner (if the receiving cable is connected or not, makes no different )
at the bottom I have an Exposure 18-s PowAmp
Pre and Pow are connected with XLR. Exposure gear offerd pseudo xlr sockets. I tried also cinch, with no different.
Tuner and cd are connected with cinch. I tried shield and normal cinch (see above) with no different.
The power cables are the cables that were there.

beside my hifi there is an classic tv, with is not connected with my hifi.

is that enough for you?

[fred sonnen]

I would like to show you some photos, but i don´t know how..
faq didn´t help... "'Pictures & Albums' link" not found...

[wee tam]

pretty sure we have someone in cologne , but for the life of me i can't remember who

[bencat]

Fred not having had too much experience with Exposure equipment this is just a stab in the dark . You say they have XLR sockets on both the Pre and Power . Is this a real fully balanced connection or just a psuedo one using the XLR as a better quality socket ? If fully balanced then all three pins should be connected with pin one being screen , pin 2 being live and pin 3 being neutral . If this is all wired correctly then it should prevent any nosie ffrom getting from one unit to another. If it is all wired correctly and still you get the hum then it may well be mechanical off a transformer but you would be able to identify this as it would be located as coming from the unit not your speakers. I am told that Exposure offer a very good customer service so it amy well be worth giving them a ring and see if they have any idea of what may be going on.

[fred sonnen]

Exposure uses psuedo one using the XLR as a better quality socket.
I tested with real XLR, pseudo XLR cable and cinch. with no difference regarding hum ;-(

[fred sonnen]

update:
As wrote above, I changed the power supply.
Exposure has fixed standard power cables.
Of these I will replace the external part to double-shielded power cable.
The connection between internal and external will be made via Neutrik NAC3 Powercon connection.
-> At the noise, nothing has changed

next think is changing the trying different grid bars.

no one has any idea?

[stewartwen]

Sounds like a grounding problem to me...................dry joints........................check all of your solder joints as the first step.
S

[earlofsodbury]

Sounds like a grounding problem to me...................dry joints........................check all of your solder joints as the first step.
S

Good suggestion. Check all the sockets especially, make sure correct grounding is present and not shorting anywhere.

[fred sonnen]

Good suggestion. Check all the sockets especially, make sure correct grounding is present and not shorting anywhere.

thanks for the reply.

I tested some sources to the PowAmp.
Mp3 player with external power suppley conneced directly to the PowAmp: Silence, only the inevitable noise.
Cd Player conneced directly to the PowAmp: Silence, only the inevitable noise.
Connecting just PreAmp itself to the PowAmp: Noise and little humming. as ever....
I tried three diffenret cables: Pseudo-XLR, XLR, Cinch.
So, from my point of view, if an error is present here, then is it to find at the PreAmp.
Are you agree?
But What?

You said: "...correct grounding is present and not shorting anywhere"
how could i check it?
What did i have to do?

[earlofsodbury]

.... What did i have to do?

Take it to a competent electronics engineer mate Won't cost much.

[stewartwen]

I agree with Paul!
DONT OPEN IT UP.....................YOU COULD GET DEADED.
S

[fred sonnen]

I am in contact with the guy, how made the recapping for my.
He is shouting my that I cut the orginal power cable.
We will see what's coming next....