Question about Nakamichi SoundSpace 5 Shelf System

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Wire antena (that came with SS5 system) causes a hum

The wire antena which came with the system (and instructions were to extend the wire for its entire length) causes a hum. If I turn the interphase that connects to the system, or move the wire itself, it increases or decreases the hum, but will not kill it. Has anyone else experienced that? I'd appreciate any tips; thanks very much.

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It is assumed that the hum is coming down the aerial wire it self....The hum should be eliminated
dissappear if you remove the wire from its connector at the rear of the receiver.

If this is the case then reconnect the aerial and try to find a radio station to listen to..

When you find a station you will find the hum dissappears as follows:

When there is no station detected the receiver tweaks up its sensitivity via the Automatic Gain Control, (AGC) and when this happens any thing that is detected on the aerial is reproduced at the speakers and in your case its just a hum.

I have heard this event lots of times and mostly its scrackles or scratchs or other weird sounds which come down the aerial while the AGC is flat out at maximum..

The radio station transmits a sound "carrier" and within this carrier there is the music content.

The receiver detects the "carrier" when you tune to the radio station, and then it sets its receive
level to the setting made by the volume control and then lovely music is presented at the speakers..

So in fact your receiver is working as it should be ,.,,, no worries mate....

Now if the hum is still there when the music is there then you have a fault, but as you havent mentiond this aspect your receiver is in my view quite "normal".

Cheers For Now

Posted on Sep 27, 2008


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Hope I can help you. When you say intermittently hums and trips from start-up. Is this when the receiver tank is empty, or up to pressure?
One of the first thing to try, you seem to have done, it is usually the check valve which can cause this.
The second thing to check would be the capacitor, but you say you have replaced the motor, was the motor AND the capacitor replaced at the same time?
By what you describe it does sound like a power problem, the pressure switch shouldn't be the cause of the humming. (The pressure switch simply tells it to switch on when the pressure is low, and to shut off when it is up to pressure)

Do you have any other power tools or equipment plugged into the same system? It may be that you might not have enough power to run all your machines?

Finally, do you have your compressor plugged into an extension lead? Vital power can be lost doing this, if so, and if you can, plug it straight into the power socket and try that.

Kind Regards


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Had this problem for years with my much loved SS5. Only just now i decided to pull it out and fiddle with it some more and have the "humming problem" SOLVED. See description and PICTURES below

-remove the 2 small philips head screws from the speaker plug.
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-whilst doing this pull back at the wire at the same time to remove the metal terminal from plastic housing.
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i used small electrical snips to "pinch" the tiny metal plugs to make the connection tighter. I pinched it till there was almost no space between the contacts then re-insert wires till it clicks and it is then locked in place.

replace the housing with the 2 screws, and when you go to plug the speaker back in you will feel it is "tighter". No more humming at all!

-repeat for other speaker. The process of "pinching" may take some practice to get it to fit nice and snug around the connecting pins in the SS5 main unit.

Note; pinch from the bottom flat surface of the metal, and you will see the contact coming closer together. if you do it from the top, it will simply spring back open when you release the pressure.

hope this helps, this problem had me scratching my head for a long time, i even tried re-wiring the plug, when it was simply the metal pins in the housing!

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