Steve Dallas
Major Contributor
These measurements are interesting to me and useful for providing context.
I let REW's RTA run for one minute in two of my rooms before taking speaker measurements. A/V equipment was on at idle. The house was empty in both cases, and I turned off the heat and other noise making things. The house is two years old and is sealed with spray foam. The attic is double insulated.
This is what I measured in my office, which has a PC running in the closet:
Note the mains spike at 60Hz, but no rectifier harmonic at 120Hz. Also note the spikes at 1K, 2K, 3K, 4K, 6K, 7K, 8K, and 9K. I wonder what those are? Why not 5K and 10K?
Here is what I measured in my living room. The refrigerator may have been running in the background, as the living room and kitchen are open concept.
Here we have higher noise in the lower octaves. This could be from that refrigerator, nearby construction, wind, something else, or a mixture of these. We have a similar 60Hz mains spike, and this time, we have its 120Hz harmonic. We again have the spikes starting at 1K and are again missing them at 5K and 10K.
Here is an overlay of the two rooms:
There is amazing agreement here. Weird.
I poked around in my REW files and have apparantly never measured the noise floor in my media room / home theater. I will do that next time I have the house to myself, but that may be a while, since we are currently experiencing a blizzard.
With 34dB minimum noise in my listening environments, how important is obsessing over certain measurements?
I let REW's RTA run for one minute in two of my rooms before taking speaker measurements. A/V equipment was on at idle. The house was empty in both cases, and I turned off the heat and other noise making things. The house is two years old and is sealed with spray foam. The attic is double insulated.
This is what I measured in my office, which has a PC running in the closet:
Note the mains spike at 60Hz, but no rectifier harmonic at 120Hz. Also note the spikes at 1K, 2K, 3K, 4K, 6K, 7K, 8K, and 9K. I wonder what those are? Why not 5K and 10K?
Here is what I measured in my living room. The refrigerator may have been running in the background, as the living room and kitchen are open concept.
Here we have higher noise in the lower octaves. This could be from that refrigerator, nearby construction, wind, something else, or a mixture of these. We have a similar 60Hz mains spike, and this time, we have its 120Hz harmonic. We again have the spikes starting at 1K and are again missing them at 5K and 10K.
Here is an overlay of the two rooms:
There is amazing agreement here. Weird.
I poked around in my REW files and have apparantly never measured the noise floor in my media room / home theater. I will do that next time I have the house to myself, but that may be a while, since we are currently experiencing a blizzard.
With 34dB minimum noise in my listening environments, how important is obsessing over certain measurements?
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