Melon Head's State of the "DUMB" Open Baffle Design

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#125
Finally some other dumb bastard on this planet (other than a dumb bass player with ears) understands this very important point.

"The answer lies in the way our ears perceive the reproduction of bass instruments. Although the fundamental frequencies developed by bass guitar and percussion do, indeed, lie in the 40 – 60Hz area, these are not the strongest output of these instruments. Like many musical instruments it is the harmonics that make up the majority of the character of sound that we, as listeners, appreciate.
On that basis, providing that a speaker can generate a strong output in a room through the 80 – 200Hz region, this will make that loudspeaker sound as though it has a tremendously powerful and apparently extended response of the character of sound that we, as listeners, appreciate.The reason I say ‘pure tone’ is because most speakers have a strong second harmonic output when fed with a 40Hz sinewave anyway. This makes most people think that 40Hz is a deep and powerful bass note when, actually, they are probably hearing more output at the 80Hz second harmonic"

Thanks for the link Buzz. I actually finished it without being disappointed. Great article
 
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#128
Melon Head's DIB - How does it work?

I have been playing around with different port sizes.
It seems that having a hole exposed in the baffle has nothing to do with tuning.
It will be interesting to try the same thing on a much larger baffle (eg PHY).
If it can extend FR from 100Hz to 50Hz I will be happy
 
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#131
Check out the frequency response measurements that I performed earlier. Anyway I want to do the same thing on the PHY baffle to see what I get

Edit: See post 83 and 84. Anyway I am starting to think it is just smoothing the response and not extending it. I will repeat it on the PHY baffle
 
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#133
it may be due to different measuring points in the room.

But simulations often really boost the bass when an open baffle is close to a wall. As did the briggs article, so it may not be out of line.

but yea, the hole in the baffle throws me also.
But the 4mh on the lower seas measures better than I'd expect due to the smallish baffle.

Norman
 
#134
Bigun said:
the images in posts 83 and 84 are showing very different positioning of the baffle with respect to the 'front wall'.
Click to expand...

Don't be fooled by the photos. They are just photos so I don't have to explain every little detail about the baffle. I usually take the pictures against the wall only because it is a nicer photo. It has nothing to do with the test conditions. The second photo is an actual photo of how the speaker was tested in both cases (in reagards to room position)

I have repeated it many times on different days and have gotten the same result. The measurements were performed under the exact same conditions.
I will try it again on the PHY and see what happens.
 
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#135
norman bates said:
it may be due to different measuring points in the room.

But simulations often really boost the bass when an open baffle is close to a wall. As did the briggs article, so it may not be out of line.

but yea, the hole in the baffle throws me also.
But the 4mh on the lower seas measures better than I'd expect due to the smallish baffle.

Norman
Click to expand...

All measurements are performed with at least 1.5m distance from any wall
 
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