Gearslutz

Gearslutz (https://www.gearslutz.com/board/)
-   Studio Building / Acoustics (https://www.gearslutz.com/board/studio-building-acoustics/)
-   -   Sub and speakers make some noise at specific frequencies (https://www.gearslutz.com/board/studio-building-acoustics/1284954-sub-speakers-make-some-noise-specific-frequencies.html)

JayPee 31st October 2019 08:18 AM

Sub and speakers make some noise at specific frequencies
 
The other day I did a simple test : play a very slow sine wave sweep through my sub, and my speakers.

The cone of my sub make a noise at a specific frequencies. It's low, around 30 Hz. Same for my main speakers. But higher, around 50Hz (about).

When I say noise, I mean, the domes resonate so high it creates a noise.

When I touch the dome with my hand, the noise is attenuated (I assume I damped the resonance this way).

Questions are : is it because of a bad speaker/sub design?

My speakers are in good condition, and the 'problem' is are on the two speakers at the same frequencies.

I was thinking using DSP to filter these frequencies. What do you think? confoosed

Maybe is there a simpler software approach if I have converter with multiple outputs?

akebrake 31st October 2019 09:21 AM

Quote:

Originally Posted by JayPee (Post 14295442)
...
Questions are : is it because of a bad speaker/sub design?...

Most loudspeakers distort in the low end because the user wants more bass than he want to pay for. gooof

At what SPL level will your speaker start creating audible distortion? 80 dBC?

Best

JayPee 31st October 2019 09:33 AM

No Idea. I didn't use any SPL meter or REW.

Just my phone to check the frequencies.

Is Adam SUB 12 a bad sub? Hmm

akebrake 31st October 2019 11:54 AM

1 Attachment(s)
Quote:

Originally Posted by JayPee (Post 14295498)
No Idea. I didn't use any SPL meter or REW.

Just my phone to check the frequencies.

If you play loud, speakers will distort. So it's level dependent.

REW (5.19) can show THD (Total Harmonic Distortion) together with Fundamental (the received sweep) and Noise floor.

You can run a couple of sweeps at different monitor level and see what it looks like.

The Sub 12 manual says (around) 1% THD @ 60Hz level: (?) SPL
and max 115dB.


Quote:

Is Adam SUB 12 a bad sub? Hmm
That's opinion.
Is Peugeot a bad car? ;)

Best

Ake

PS I'm not a subwoofer expert.