![]() There is no exception to my previous post. I can do quite a lot of things, but there are soms limits to what I can do to a living room, to prevent it to become soms kind of studio It's still a living room so basstraps, stuff at the ceiling etc. I can do quite a lot of things, but there are soms limits to what I can do to a living room, to prevent it to become some kind of studio I don't have this illusion that this will solve the room mode, but I think there will be a small improvement. This is the wall that generates the room modes. We are planning on buying a big 2.50m by 1.25m acoustic panel (photo) for the wall behind the listening position. I can only hope this thing will be removed as soon as the electricity at the location is finally connected. In the meantime I went to the generator and found this is indeed running 24/7 and the 50Hz spike around the generator was huge. Quite a coincidence that my room is exactly the length of 50Hz, so a 50Hz buzz is way more noticable. So I think my house is exactly at the point the amplitude of the hum is at it's peak.Įxcept maybe from halve and doubles of the room modes?Īccording to the calculations my room has room modes exactly at 25 and 50 Hz. The distance between my living room and the generator is about 100 meters.ġ,5x 68 meters is 102 meters. The wavelength of a 50Hz tone through concrete is 68 meters. This tone is audible and I know of people who had years of low frequency noise in their homes and could never find the source of it. If it's not from there, I got a bigger problem. This machine will be gone after the building is finished. Ik really hope that the generator is the cause. I cannot find a way to see if my room is cousing huge spikes or that the external hum is influencing my measurements. The 50Hz tone I can get around, but the 25Hz tone is excited a lot in my room. The room modes are not a problem when listening, but measuring the installation is a problem. My bedroom had a sloped (Gable?) roof, only the bottom part is straight at 6,85m. I saw the 25Hz tone there also, but a lot less. The 6,85m width of my L shaped room is exactly at the 25 and 50Hz mark. The 25Hz tone is due to the room mode in my room, I'm quite confident about that. The 50Hz tone definitely comes from outside. Room modes are a lot wider in bandwidth AFAIK. But why in a quiet room and why a very narrow exact 25 and 50. According to the room mode calculator this is a length that exites exactly the 25 en 50hz tones. On the other hand, one of the dimensions of my room is 685 centimeters. The short original cord does not make a difference, Also disconnecting the HDMI cable etc to the rest of the system makes no difference.Īfter all of this, this still does not make sense when doing a measurement, that these 25 and 50hz peaks are that visible, The subwoofer is way louder than that. The 25 and 50 Hz tones are more 30 to 40 dB above the noise floor. I've tried several locations within reach and in the hallway at the front door, when I put the Umik-1 inside a shoe (to dampen incoming sounds) and put coats over it, I can still clearly see the 50hz. Guess the generator is not a factor then. I can also not hear that generator.Įdit: I just drove past the generator and it seems that it is turned off now. I have no possibility to turn this thing off and check is it works. As far as I know that thing is running 24/7 at the moment. There ís a power generator (Diesel generator?) running at that location. there are 2 rows of houses between my house and the construction work. I can hear machines there, but it's not very loud. In our neighbourhood there is construction work going on. I have a possible explanation, I'm not sure if this is possible. Please Log in or Create an account to join the conversation. Also the reverb is huge in that frequency. If I play a 25Hz tone through my setup (without EQ), my entire livingroom starts to shake. I live in the netherlands, so my mains power is 50Hz. Is my Umik-1 broken or is there something wrong? If this was a real background noise I would expect it to fade away an not be noticable. ![]() When I run a sweep, this 25 and 50hz spike comes on top of the measurement taken. The spikes I see there are at 25 and 50Hz in a quiet room. Running an RTA in REW unvealed that the noise is measured also when no sound is played (Subs and Poweramps OFF). After I measured my mains and subs separately I noticed the spikes were present there too. I'm kind of a purist, so I measure my speakers, align the subs, set the crossovers/bandpass manually and apply EQ only where necessary.Īt first I tried to even them out with EQ, but it had almost no effect, other than my installation losing the ability to reproduce these notes correctly. I got 25 and 50 hz spikes in my measurements. I have had troubles with calibrating my subs and speakers.
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