At what level is noise heard in your system?

[restorer-john]

Trains can really muck up low frequency levels from miles away.

And thunderstorms!

We had an absolute ball-tearing storm at 6pm last night, massive trees torn out all around us, powerlines down and no power for 18 hours. 20,000 people without power still. The low frequency energy in the thunder moves our entire house (it's a pole home). Amazing lying in bed getting thunder frequencies you can't really identify how low they are but they almost hurt and every pane and panel rattles.

Apparently, more storms tonight too.

At least I have the generator out to power the fridge full of Christmas fare, people around us were throwing out the contents of their fridges as they clearly were too dumb to stop opening the door while the power was off. I didn't touch ours and the internal temps were still -5 degrees C and 7 degrees C after 18 hours with no power. Not bad. Lost nothing.

 

[Wombat]

And thunderstorms!

We had an absolute ball-tearing storm at 6pm last night, massive trees torn out all around us, powerlines down and no power for 18 hours. 20,000 people without power still. The low frequency energy in the thunder moves our entire house (it's a pole home). Amazing lying in bed getting thunder frequencies you can't really identify how low they are but they almost hurt and every pane and panel rattles.

Apparently, more storms tonight too.

At least I have the generator out to power the fridge full of Christmas fare, people around us were throwing out the contents of their fridges as they clearly were too dumb to stop opening the door while the power was off. I didn't touch ours and the internal temps were still -5 degrees C and 7 degrees C after 18 hours with no power. Not bad. Lost nothing.

Unusual weather over most of Australia at present.

 

[Blumlein 88]

And thunderstorms!

We had an absolute ball-tearing storm at 6pm last night, massive trees torn out all around us, powerlines down and no power for 18 hours. 20,000 people without power still. The low frequency energy in the thunder moves our entire house (it's a pole home). Amazing lying in bed getting thunder frequencies you can't really identify how low they are but they almost hurt and every pane and panel rattles.

Apparently, more storms tonight too.

At least I have the generator out to power the fridge full of Christmas fare, people around us were throwing out the contents of their fridges as they clearly were too dumb to stop opening the door while the power was off. I didn't touch ours and the internal temps were still -5 degrees C and 7 degrees C after 18 hours with no power. Not bad. Lost nothing.

Trust me I know about thunderstorms. Where I live we have them about every other day in the summer months.

Hope you get power back soon.

 

[trl]

My 2am noise floor with a UMIK-1, and two or three fans running quietly.

[...]

My 3pm noise floor. Nearly the same, just more distant low frequency noise - probably trucks and cars on the Interstate, 2.75 miles away, and local business traffic about 1.75 miles at its center.

[...]

With a -79dBfs 1kHz tone when the output volume of the speakers is "calibrated" to 66dB SPL at -30dBfs at the listening/microphone position

If A-weighted, then about 2dB more, so...around 20-21dB. I don't really trust my mic, but till I'll get a calibrated one I'll take this for granted. After all, in my bedroom is so so quiet that I need to stop breathing when doing such test. Also, I need to unplug my TV because I can actually hear the 16KHz noise of the SMPS coils...I can also see it in the REW graphs.

 

[Sal1950]

I envy you guys with the dedicated rooms. My open architecture room that includes the kitchen with refrig and a skylight for the rain to beat on is quite often horrid.

 

[trl]

It's extremely quiet in my house, 3-glass windows, 30cm glass-wool in the attic. The only thing that could disturb my silence would be couple of stray dogs or the airplanes (usually after 5 AM).

This silence helped me a lot in identifying the exact place where the wood-worms were located above my head, in the attic (around 4-5 AM), couple of years ago.

 

[Sal1950]

This silence helped me a lot in identifying the exact place where the wood-worms were located above my head, in the attic (around 4-5 AM), couple of years ago.

Sure that isn't a group of ear mites you hear munching?

 

[Wombat]

Some might have said their DAC has a sound like munching termites and get upset when asked to verify the opinion.

 

[Sal1950]

Some might have said their DAC has a sound like munching termites and get upset when asked to verify the opinion.

I believe Amir has positively identified those irregular noises as nervous jitter.

 

[trl]

Sure that isn't a group of ear mites you hear munching?

I know it's so off-topic, but the biggest worm/larvae had 8 cm (about 3 inches) and I was able to use my ears and hear how these worms were actually eating the wood from the attic. Extremely complicated job to resolve it...about 2 years and only poison won't help here, just two hands and knife.

 

[Sal1950]

I know it's so off-topic, but the biggest worm/larvae had 8 cm (about 3 inches) and I was able to use my ears and hear how these worms were actually eating the wood from the attic. Extremely complicated job to resolve it...about 2 years and only poison won't help here, just two hands and knife.

DAMN! Hand to hand combat with worms???

 

[Wombat]

I know it's so off-topic, but the biggest worm/larvae had 8 cm (about 3 inches) and I was able to use my ears and hear how these worms were actually eating the wood from the attic. Extremely complicated job to resolve it...about 2 years and only poison won't help here, just two hands and knife.

The big one was the queen. If you kill it they quickly make another one.

 

[Sal1950]

The big one was the queen. If you kill it they quickly make another one.

So these are more of those crazy "down under" critters? Had to google lasi RO, thought at first we were talking about Rhode Island USA?
I think ya'll even got Crocodiles to go with our Florida Alligators.

 

[Wombat]

So these are more of those crazy "down under" critters? Had to google lasi RO, thought at first we were talking about Rhode Island USA?
I think ya'll even got Crocodiles to go with our Florida Alligators.

Don't you have termites or white-ants?

 

[Sal1950]

Don't you have termites or white-ants?

For sure, but not snake sized worms that have to be manually eradicated via hand to hand bayonet combat.

 

[Wombat]

You might be thinking of these:

Giant worms.

Unlikely to bother you unless you are on a mostly red meat diet.

 

[trl]

You might be thinking of these:

Giant worms.

Unlikely to bother you unless you are on a mostly red meat diet.

We're off-topic here.

See some pics from my woods here: https://www.misiuneacasa.ro/forum/f...antitermite-anticarii-etc?p=529588#post529588.

Can't find the movies with the big ones, but I can search in-depth if needed. I used knife and vacuum cleaner.

 

[Wombat]

Off-topic tends to occur for fun or when an original topic runs out of steam. Getting back on topic only requires a good relevant post. IMNSHO.

 

[Thomas savage]

Well in this case we need to farm some data as indeed was the original intent of the thread.

 

[Wombat]

Well, with LPs I can hear the grain in the thermo-set vinyl compound/substrate being reproduced. Most obvious in the run-in and run-out grooves.

Let the fireworks begin.