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Guess How Big My Speakers Are

If you read any of my threads on here or looked at my virtual system you probably already know the answer to this question, but for those who have not, try this as a thought exercise. Given this plot alone how big a speaker do you think this is?

Frequency response plot showint extension to 20 Hz

 

Hints:

  • 2’ from sides, 1.5’ from rear
  • Ported
  • Not horns
  • No EQ applied. This is the natural in room response using short sine sweeps.
  • For a living room this is a well treated room with GIK soffit traps, bass traps and diffusion panels strategically placed.

I’ll reveal my answer if we get 5 guesses or more. :)

erik_squires

Showing 3 responses by herman

herman
2,215 posts
 

it is impossible that you are actually getting as much output at 20Hz as you are in the midband.

herman
2,215 posts
 

it is impossible that you are actually getting as much output at 20Hz as you are in the midband.

@herman In an anechoic room you’d be correct. The room however bedevils those expectations, and that’s the point of the posting. 

I'm going to stick with my initial response. I don't care what kind of room you are in, .. you are not  really getting a strong 20 Hz out of those speakers

 

herman
2,215 posts
 

@herman but it is, and I’ve measured it. It’s not "real." It’s not the capability of the speaker so much as the resonance of the room.

 

I’ll try one more time and then leave you to it. I don’t care how much your room is adding to it, it is impossible you are getting the same level at 20 Hz that you are in the midband with a 6.5 inch speaker.. impossible.... your measurements are incorrect.

something is wrong with your measurements at the top end too when you turn up the midband by 10dB (red to yellow) but at 20KHz it goes up 20dB

if you play a 20 Hz tone do you hear it?

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