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Static hiss?


SnowDrifter

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I just noticed this today. I can hear a static hiss coming through my super tweets. It's faint, but it's there. Doesn't matter whether the RCAs are plugged in or not, nor whether the car is on or off.

It's not alt whine, but it sounds like a white noise

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The amp inputs are unterminated and therefore floating.

Like you said it's probably picking up random white noise from the air.

Short the two input conductors and I bet it goes away.

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2004 BMW M3
Mechman 280A
2 - XS Power XP3000

1 - XS Power D375

500F of Maxwell SuperCaps (soon to be 1000F)
iPadMini2

Dash mounted O-scope
Audison bitOne (Remote DRC MP)
Highs Amp - PPI Art A404
Hertz HSK130 (HSK165 waiting...)
DC Audio DC9.0K
2- DC Audio XL12m2

LEGAL             - 147.3dB @ 41Hz
OUTLAW         - 150.2dB @ 45Hz

OUTLAW         - 145.7dB @ 30Hz
JUNE 2014 SOTM WINNER

2014 COLORADO PEOPLE'S CHOICE WINNER

SOTM BUILD:
http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026

sig-sized6_zps0265e669.png

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Connections are tight. I went out there with a wrench and made sure of it lol.

No frays on the wires going to the tweets either

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The amp inputs are unterminated and therefore floating.

Like you said it's probably picking up random white noise from the air.

Short the two input conductors and I bet it goes away.

What so do you mean by short them?

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Short the RCA center conductor to the outside conductor with some wire, a shorting plug, a relatively low ohm resistor...

Is the noise a problem?

You said only when the signal cables are unplugged so it shouldn't be a problem.

I'm sure a lot of amps do this when disconnected.

This post sent with 100% recycled electrons.
2004 BMW M3
Mechman 280A
2 - XS Power XP3000

1 - XS Power D375

500F of Maxwell SuperCaps (soon to be 1000F)
iPadMini2

Dash mounted O-scope
Audison bitOne (Remote DRC MP)
Highs Amp - PPI Art A404
Hertz HSK130 (HSK165 waiting...)
DC Audio DC9.0K
2- DC Audio XL12m2

LEGAL             - 147.3dB @ 41Hz
OUTLAW         - 150.2dB @ 45Hz

OUTLAW         - 145.7dB @ 30Hz
JUNE 2014 SOTM WINNER

2014 COLORADO PEOPLE'S CHOICE WINNER

SOTM BUILD:
http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026

sig-sized6_zps0265e669.png

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It does it regardless of whether the RCAs are plugged in or not

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What does your TV do when it's modulator (off-air signal) has no signal?

Snowy white and black screen (white noise), right?!

Same thing here.

This post sent with 100% recycled electrons.
2004 BMW M3
Mechman 280A
2 - XS Power XP3000

1 - XS Power D375

500F of Maxwell SuperCaps (soon to be 1000F)
iPadMini2

Dash mounted O-scope
Audison bitOne (Remote DRC MP)
Highs Amp - PPI Art A404
Hertz HSK130 (HSK165 waiting...)
DC Audio DC9.0K
2- DC Audio XL12m2

LEGAL             - 147.3dB @ 41Hz
OUTLAW         - 150.2dB @ 45Hz

OUTLAW         - 145.7dB @ 30Hz
JUNE 2014 SOTM WINNER

2014 COLORADO PEOPLE'S CHOICE WINNER

SOTM BUILD:
http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026

sig-sized6_zps0265e669.png

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How would I short out the RCAs while they are plugged in?

Are you sure that would work? Seems like it would screw up the source when it's putting a signal into a couple ohms vs. 20k ohms

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