Audible noise on Genelec 8351 - Forum
Genelec Community Forum has been archived
Thank you for all the years of Community discussions and activity!
The time has come for us to retire the community forums, but we will keep everything available for reading. There is a lot of valuable content written over the years, and you'll be able to access all of that. However, no new posts can be written, or old posts modified.
If you have questions, we recommend you use the Support function on the bottom right corner to contact our Customer Support directly.
Alternatively, if you wish to engage in a community discussion with other people, there are many active forums available. There is also an active, fan managed GENELEC COMMUNITY in Facebook, and many Genelec employees are active in the discussions there.
We are sorry for any possible inconvenience this may cause you, but we hope to hear from you through the other channels mentioned above.
Audible noise on Genelec 8351
I am using Genelec 8351 monitors for about 3 weeks in a stereo setup mostly for music listening. Unfortunately they produce audible white noise even at a 2 m distance when no audio cables are plugged in. At lower distance there is also a buzz noise audible from the woofers.
Formerly used monitors' noise wasn't audible at distances greater 1 m.
Is it a common problem or might it be related to something else?
Can you tell me little bit more about your system? Are you using analogue or digital signal? Are you using the GLM software? If yes, are you adjusting the volume from there?
Background noise is slightly higher if using the analogue signal. Volume setting in the GLM will also affect the noise level.
anlog inputs are used and the volume is controlled by a preamp. GLM hasn't been used yet. The noise is already audible at 2 m without any audio connections. Attaching the audio cable an powering on the preamp makes almost no difference.
At the weekend I got a chance to measure the sound pressure with a sound level meter. It was setup at 10 cm distance to avoid any residual noise from the surrounding and no audio cables where plugged in to avoid noise from the preamp. The reading showed a level of 50 dba, which would translate to about 38 dba at a 2 m listening position, which seems high too not notice with highly dynamic music material.
Would setting up the speakers with the GLM, reduce the background noise of the speakers itself or is it similar to the System Level rotary control?
I took comparison measurements today in our anechoic chamber and using a professional SPL meter. At 10 cm distance SPL was about 30 dBA which translates to 4 dBA at 2 meter distance.
There seems to be something wrong with the calculation you present because 50 dBA at 10 cm would translate to 24 dB at 2 meter distance. Sound level attenuates by 6 dB per doubling the distance.
My calcalution is wrong, somehow I have taken a start distance of 0.5 m.
30 dbA seems ok, since my older monitors where rated <8dB SPL @ 1m from specs, and weren't audible at 2 m distance. Is there a possibility that the noise gets influenced by other things like WiFi, Bluetooth ...?