The BIG fight against noise in the audio setup

I had a Fritzbox when I lived in Austria. Worked well, easy user interface. Could teach some UK ISPs a thing or two about equipment performance and usability.


Here you can usually only get the FRITZ!Box from your Internet provider for an extra charge. Otherwise, there is the usual scrap.

Edit: And I wish there was an option to fine tune FW rules. Mesh became quite good. Home automation is nice.

Edit2: And an option to use rechargeable batteries with the thermostat. Suggested this to AVM, never got an answer.

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With some options missing, at least here from Vodafone Germany. Better than the Vodafone crap router, but after my experiences I’d always by my own Fritzbox now

ok, I ran into some “noise” I didn’t see talked about yet.

Once in a while I set-up my UMK-1 and REW and I tinker. Before running sweeps and test tones I take a reading of the room with all the audio bits turned on (including tubes). Today it was above 40dB. My room is usually under 40dB. This was verified with a simple phone app. The ability to discern “noise floor” is directly related to how quiet your room is. Now I need to figure out why the ambient noise level in my room has increased since last time I tested (months ago).

Great idea, never thought of to do a measure only go the room. I guess it would be somehow unpredictable as I live next to a somehow heavy traffic street but I’ll do it. Do you integrate those readings in the construction of the filters that are for your speakers?

I don’t use any digital filters though. I use REW to adjust placement, toe, sub integration, etc. When I finally stop moving this around and adding room treatment I’ll move to room correction dsp.

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Thanks for your answer.
For sub integration, do measure only the speakers then you play with the settings on your sub and watch REW to see the better settings?

oh this could go deep conversation…

I’ll try to summarize. At the end of the day you want the subs to fill in frequencies where the mains can’t but not add to frequencies already excited by the room. And, time alignment may be important as well.

I start with both stereo and individual sweeps L / R subs off and I go up to 600 or 800 Hz since crossovers are leaky and I’m feeding full signal into the subs. This lets me know exactly what each speaker is doing and if there is any combing. I then work one channel at a time (I run stereo subs) finding a curve I’m happy with and getting them to overlap as well as the room will allow. Then I go back to stereo and make final adjustment.

The work I did today was to take my subs from “club loud” to much better in balance to both the room and the mains. Not as much “fun” but significantly more articulate and accurate now. Although… I do miss the back massage as they were loud enough to shake the couch :stuck_out_tongue: Maybe I’ll end-up turning them up a little in a few days.


We had the house apart anyway because we lifted it, (flood zone). I put in 4 dedicated 20amp lines for the A/V system and I’m very pleased with the results. The front end has it’s own, the video part has it’s own, and each power amp has one. It seems to me the noise floor lowered and the system got more dynamic, (subjective, I know).

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My 2 cents (with some measurements): I don’t worry about electric noise from the computer at all after adding and iFi galvanic isolator in the USB chain before my DAC. Fan noise is real, so I went with a fanless case. I have dedicated 20 amp runs for my rack, but they are surprisingly noisy (measured with a greenwave) so I use power conditioners that get it down to good levels.

Now whether or or any of this is really audible is a crapshoot. I do think my amp sounds a bit better when plugged into the conditioners, but I haven’t done any formal double blind AB tests.

I generally try to use good quality cables (mostly audio quest) and run interconnects isolated from power. But I haven’t gone overboard.

For EF noise the greenwave provided good peace of mind.

For a minimal investment I have definitely reached a point where I no longer care about fixing noise any further, which lets me move on to enjoying the music rather than fretting.


I’ve not been asked, but would like to chime in here.

Taking ambient noise readings before doing speaker/room measurements always is good practice, as you want to maximize the signal to noise ratio to at least 20dB.
That might especially be problematic in the low frequency range, since it’s good practice also, to take measurements at levels which correspond to your preferred music listening.

As you want to correct for the speaker/room interaction only, one definitively should not use measurements, where “unpredictable heavy traffic” noise interferes.


You are always welcome. Thanks for you points. I try to take the measurements around 4 am were there is no traffic, and when it happens it is just wonderful to start over :slight_smile:

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Yep, familiar story, it’s a great excuse for a late-night session as well :slight_smile:

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Bolder approach needed. Don’t just measure when it quiet. Move to where it’s quiet. Real audiophiles live in the countryside :sunglasses:


The number of times I’ve got REW set-up, done all my level tests, plan out where I want to focus on adjustments, sit behind the machine… set-up the measurement and… My neighbor decides that’s the very best time to mow their lawn is too many! :slight_smile:


That’s one problem that goes away at 2 AM :wink:


Run the Dirac sweeps at 2am :joy::rofl::joy: You’re gonna have us all sleeping on the patio chaise with the doors locked.


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