Electrical questions
Willow
Posts: 11,055
Couple of things I need help with:
What can be done about humming from dimming lights?
I seem to also hear a slight humm/hiss from my tweets ever since I plugged in my new amp (which is plugged in to my monster powerbar). As per my sig everything is on a dedicated breaker. What can I do?
My plasma seems to be humming as well from the back of the unit.....
Thanks ahead of time
What can be done about humming from dimming lights?
I seem to also hear a slight humm/hiss from my tweets ever since I plugged in my new amp (which is plugged in to my monster powerbar). As per my sig everything is on a dedicated breaker. What can I do?
My plasma seems to be humming as well from the back of the unit.....
Thanks ahead of time
Post edited by Willow on
Comments
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Dedicated circuit and line.
Contact manufacturer of the Plasma to
ask if the humming is considered normal. -
Dedicated circuit and line.
Contact manufacturer of the Plasma to
ask if the humming is considered normal.
Everything is on a dedicated line and breaker.
As for the plasma I will do some more investigating -
1) Don't use dimmers!
2) Add chokes to the power cables for your equipment(a 'meh' type upgrade).
3) As for your plasma, too big a can of worms for me to open. -
+1 on avoiding using dimmers.
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Everything is on a dedicated line and breaker.
As for the plasma I will do some more investigating
meant to say that just your equipment is on the circuit
no lights, popcorn machine, or theater massage chair... just kidding...
you know what I mean -
meant to say that just your equipment is on the circuit
no lights, popcorn machine, or theater massage chair... just kidding...
you know what I mean
Yep nothing else on it -
so the lights' dimmers that are humming
is not on the same
circuit / line as your equipment.
are you saying that another separate line that your lights are on
is introducing humming onto a dedicated circuit / line that your equipment is using ? -
1) Don't use dimmers!
2) Add chokes to the power cables for your equipment(a 'meh' type upgrade).
3) As for your plasma, too big a can of worms for me to open.
I guess I'll look for some 40w bulbs. It sucks cause there are 4 pot lights in that room on the dimer. The room is in the basement sometimes we need lots of light (when cleaning) and most times we like it dim for tv movies and games. -
I think he's saying it sounds like the bulbs themselves hum, likely when the dimming feature is used.
I hear no complaints of an odd buzzing from the speakers.
Speakers appear to have 120Hz hum, same as the plasma TV.
He hasn't complained of any actual interference, yet!
edit: Sadly, you might as well leave the full strength '100 watters' in there, and use a desk lamp for watching movies.
Even better, backlight your TV!!!! You can leave it on permanently and it'll totally add to the movie lighting experience. -
ok... he did say "I seem to also hear a slight humm/hiss from my tweets ever since I plugged in my new amp "
I just thought of something else
does the hum go away when the lights are off ....
is he saying he has multiple hums from different places
that are not related ?
I understand about the plasma and he will investigate that separately -
As for the speakers humming and hissing, how close do you have to be to hear it?
I know your cabling is likely mint and quality at that. If there's anyway to turn the amp gain down(not the volume), that might be your solution. -
ok... he did say "I seem to also hear a slight humm/hiss from my tweets ever since I plugged in my new amp "
I just thought of something else
does the hum go away when the lights are off ....
is he saying he has multiple hums from different places
that are not related ?
I understand about the plasma and he will investigate that separately
Lights and gear on a different electrical line. there is a slight hum/hiss from the tweets only audible when standing next to the speakers.
They are not $1000 cables but they are not cheap ones out of the box. The hum from the lights are only when they are dimmed. They are the flood light type bulbs, not sure if different bulbs can/ not have the same effect.As for the speakers humming and hissing, how close do you have to be to hear it?
I know your cabling is likely mint and quality at that. If there's anyway to turn the amp gain down(not the volume), that might be your solution. -
i'm curious still about this statement
..."I seem to also hear a slight humm/hiss from my tweets ever since I plugged in my new amp "
It appears that you are saying the humm/hiss is attributed to the "NEW" amp
what make and model ?
Can you contact your dealer to swap to see if it is an issue with that specific make ?
Compare to a different Amp of a different Manufacturer.
What else do you have connected to the speakers ? -
HT- HK 335, Rotel 1075, Miova PC, AQ Indigo speaker cable, XLO jumpers, AQ Diamondback Ics, AQ HDMI x2, AQ component, Signal cable analog II Ics, Signal cable digcoax, Signal cable Toslink, Rti8, Csi3, Rti6, Energy s10.2, Panny 42" Plasma, PS3, LG dvdp and Harmony 659, Monster 3600MKII all on a dedicated breaker .
I've had the amp for about a year now and bought it here on CP. So I can't return it. -
does the humm/hiss occur if all the inputs are physically disconnected
that is
only the amplifier "Rotel 1075" ( I assuming this is the amp you are referring to )
and the speakers are connected.
I'm thinking signal to noise issue...possibly -
does the humm/hiss occur if all the inputs are physically disconnected
that is
only the amplifier "Rotel 1075" ( I assuming this is the amp you are referring to )
and the speakers are connected.
I'm thinking signal to noise issue...possibly
I have not yet played with unplugging everything else but the amp or plugging the amp directly in to the wall by itself, these are things I will tackle this weekend. Yes the rotel is the only amp connected to this system. If it is sig/noise issue how is this remedied? -
it appears that the Rotel is a 5 channel amplifier
does the noise occur
on every channel ?
if the amp is suspect then repair may be needed. -
it appears that the Rotel is a 5 channel amplifier
does the noise occur
on every channel ?
if the amp is suspect then repair may be needed.
I'll need to check, the only reason I noticed the hiss is that one of the pot lights are right above the speaker, so i followed my ear and it brought me to that area. I then put my ear near the tweet and heard the faint hiss and heard the big hiss from the pot lights. I never did check if the rears or centre make the same noise. That, I can check tonight. But I have to put my ear near the tweet to hear it. -
also
is the volume or gain control
where is that positioned ?
if no input signal
is the volume / gain output control in the off or zero position ?
could it be sympathetic vibrations ... like a resonance
induced by the lights ? -
It's likely noise from the input stage of the amp. Unplugging the inputs(or even muting them) probably won't change anything.
Amps designed to have low noise have inherently complex distortions. Simpler designs which preserve the input signal integrity tend to have higher power supply noise(hum) and input stage noise(hiss).
If you're hearing a 'buzzing' whose character changes when you do things, this is interference.
If you're hearing constant hum and hiss, get over it. Or turn the amp gain down(if you can).
Backlight that TV, son! -
It's likely noise from the input stage of the amp. Unplugging the inputs(or even muting them) probably won't change anything.
Amps designed to have low noise have inherently complex distortions. Simpler designs which preserve the input signal integrity tend to have higher power supply noise(hum) and input stage noise(hiss).
If you're hearing a 'buzzing' whose character changes when you do things, this is interference.
If you're hearing constant hum and hiss, get over it. Or turn the amp gain down(if you can).
Backlight that TV, son!
Well, I plan on wal mounting it and moving some gear around over the xmas holidays so i will look into getting some backlighting.
From what I have checked seems like I should get over it as I think this is the case. -
it would certainly be interesting to track down and understand the cause of it.
diminishing returns.....
more fun watching videos and listening to good music for sure -
I have yet to hear an amp with no hum or hiss. Get your ear within 2" of that tweeter and you'll hear some hiss. Does that mean all amps suck? No. Does that mean the speakers are too sensitive? No.
Does it mean YOUR amp sucks? Yes it does! Time for an upgrade. -
As far as your light issue, I was thinking that if you have any means to modify your wiring you could go with the older way for lowering your light by using the old type 2 filaments bulbs which could provide you with up to 3 different brightness levels (elinimating the noise caused by the diming solution). I haven't figured it out electrically but I guess using 2 or 3 way switches could achieve the desired results.I guess I'll look for some 40w bulbs. It sucks cause there are 4 pot lights in that room on the dimer. The room is in the basement sometimes we need lots of light (when cleaning) and most times we like it dim for tv movies and games.
You also have to consider the dimmer and/or the bulb could create the problem by replacing with higher grade dimmer and bulb.
Read this for potential easy fix; http://www.selfhelpandmore.com/switch-outlet/noisy-dimmer-switch.php
Cheers!
TKDARE TO SOAR:
Your attitude, almost always determine your altitude in life
-
I have yet to hear an amp with no hum or hiss. Get your ear within 2" of that tweeter and you'll hear some hiss. Does that mean all amps suck? No. Does that mean the speakers are too sensitive? No.
Does it mean YOUR amp sucks? Yes it does! Time for an upgrade.
I think you suck! Stop harassing me via PM!
........all the best in school buddy, I'll send you a text one day, we'll catch up.As far as your light issue, I was thinking that if you have any means to modify your wiring you could go with the older way for lowering your light by using the old type 2 filaments bulbs which could provide you with up to 3 different brightness levels (elinimating the noise caused by the diming solution). I haven't figured it out electrically but I guess using 2 or 3 way switches could achieve the desired results.
You also have to consider the dimmer and/or the bulb could create the problem by replacing with higher grade dimmer and bulb.
Read this for potential easy fix; http://www.selfhelpandmore.com/switch-outlet/noisy-dimmer-switch.php
Cheers!
TK
Merci TK for the link. I'll check it out. My next try this weekend is swaping out the bulbs. Like I said, I might try some standard bulbs and not the flood light types. -
The first thing to so is seperate all your wires from each other and make sure none of the IC, speaker wires, and power cords DO NOT TOUCH each other. All commections should be clean and tight.
I'm running the 42" Panny plasma with no problems for what it's worth and I have ZERO noise.
I did have some issues with the PC interferrence but new cables fixed that.
Your lights may be an issue but I'd try the obvious, simple, free, things first before I spent money without knowing exactly what the culprit is.
Also when checking components one at a time make sure to check all 12v phone chargers and bases.
I had a DeWalt cordless drill charger in the other end of the house that gave me a hum so it may not even be on the same circuit.
ONE component at a time for the checks or you'll just be guessing. Most hums are easy to find but may be a P.I.A. depending on how many pieces you have to mess with.
Good Luck,
Harry
