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Old 26th April 2010, 05:25 PM   #1211
rtate is offline rtate  Canada
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Glad to see this thread still kicking!!

My F5 is working great but I have a slight hum in both speakers that I would like to get rid of.
The speakers are very efficient at about 95db and with no music playing I can hear a hum from about 3 ft.

I was wondering if anyone is using a "star ground" and if so how is it connected??
I would like to try this to see if it will help.
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Old 26th April 2010, 05:33 PM   #1212
cviller is offline cviller  Denmark
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rtate, could you please take a picture where we can see the wiring or draw a (detailed) diagram of your wiring? Someone might be able to help you then. My F5's are very quiet, but I have a chip amp that picks up mexican radio!!!

Mine is wired like this:
http://viller.eu/audio/2009jan_gbf5/...74_wiring1.jpg
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Old 26th April 2010, 05:43 PM   #1213
cviller is offline cviller  Denmark
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Hum is often caused by chassis grounding and ground loops between components, so if you could draw that as well it would be great. You can use a thermistor to connect chassis to gnd and thus limit some types of hum.
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Old 26th April 2010, 06:17 PM   #1214
rtate is offline rtate  Canada
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Thanks Christian, I have wired my F5 as per your picture above.
At this point I do not have anything connected to a "chassis ground"
only the safety ground is connected which I have tried both on and off.
I have been moving my gear around latley and will take some photos as soon as I can....
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Old 26th April 2010, 06:22 PM   #1215
cviller is offline cviller  Denmark
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Do you use insulated rca plugs?
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Old 26th April 2010, 06:38 PM   #1216
rtate is offline rtate  Canada
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If by insulated you mean insulated from the chassis then yes.
I tested with a meter to insure no grounds or shorts.
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Old 26th April 2010, 06:41 PM   #1217
cviller is offline cviller  Denmark
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I have not read this article, but it may offer you some advice/clues while we are waiting for the pictures:
Audio Component Grounding and Interconnection
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Old 26th April 2010, 08:35 PM   #1218
Renron is offline Renron  United States
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Rtate,
If you unplug the RCA interconnects from the F5, is there still a hum?
If not then it is caused by an upstream piece of equipment or cable.
Next try, Unplug the other end of the interconnects, CD / preamp / receiver, whatever, leave the interconnects on the F5 side, try them one at at a time, left then right. Sometimes it can be a bad cable.
Sometimes the interconnects act as antenna. But you knew that.
Try unplugging everything from the power except the F5. Hum still? Is the transformer bolted down tightly?
Keep us informed, especially if you DO find the hum source, it will help someone else.

Ron
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Old 26th April 2010, 11:04 PM   #1219
rtate is offline rtate  Canada
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Thanks Guys, I did some investigation when I got home from work and once again Never Assume!!!
Turns out that the F5 IS dead silent.
I have a plate amp that is driving the low frequency drivers and that is the source of the hum.
So I still have a problem, just not the F5.
Now, for some more investigating....
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Old 26th April 2010, 11:56 PM   #1220
Renron is offline Renron  United States
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Yeah, Congratulations on another silent F5!

Good luck with the "other" amp.

Ron
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