Well first experiment failed ( baf wadding)

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#21
markbakk said:
Well…. smoothing out the response ís what you should want actually. ‘Lively and open sound’, to me it occurs you like the resonances inside the enclosure. Nothing wrong with that obviously, and great you are experimenting. My design targets are different, but that is the fun here, everyone is entitled to strive after his or her perfection.
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yeah. The measurements looked good. But the clarity was gone.

the bass lost a lot of clarity and so did the mids and highs to a lesser degree tho.
actually I take that back. The bass lost clarity for sure. Super obvious.
but I don’t know about the mids and highs. The imaging was different and I think a bit better.
 
#24
You may be better doing more near-field measurements e.g. 0.5m, centred at tweeter height for comparing specific speaker tweaks. This will help reduce some of the room effects.

In saying that, your listening impressions are still relevant.

There is another recent thread on adding bracing to an commercial speaker which is another rabbit hole to explore in the spirit of DIY 🙂
 
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#28
Earplay2020 said:
You may be better doing more near-field measurements e.g. 0.5m, centred at tweeter height for comparing specific speaker tweaks. This will help reduce some of the room effects.

In saying that, your listening impressions are still relevant.

There is another recent thread on adding bracing to an commercial speaker which is another rabbit hole to explore in the spirit of DIY 🙂
Click to expand...

yeah I guess my woofers thought the cabinet was bigger than it was adding the extra wadding in there.
and they didn’t like it
 
#30
How does Proac find the ‘ optimal’ lining in their cabs ?

they Use the exact same approach to all their cabs As in mine. Even the high end speakers

do they calculate the Vbox and design a slightly smaller box, and then compensate with damping which will increase the box size a bit?
 
#31
You've touched on what I was trying to say. It's too complicated a situation with all the different contributions and resonances to say that there is only one way to do it. They have found one way that works, by covering all the audible issues in some way or another. The reason I brought it up is to show that this doesn't have to be the end of your cabinet tweaking... of course now you're wise to the idea of taking it one step at a time 🙂
 
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#32
AllenB said:
You've touched on what I was trying to say. It's too complicated a situation with all the different contributions and resonances to say that there is only one way to do it. They have found one way that works, by covering all the audible issues in some way or another. The reason I brought it up is to show that this doesn't have to be the end of your cabinet tweaking... of course now you're wise to the idea of taking it one step at a time 🙂
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yeah this was very educational and opened up more questions in my learning experience.
i always do one tweak at a time to control the effects of what I’m doing. And see what does what.

thanks man!

now I’m more motivated. Ha
 
#33
Ok I’m gonna dumb this down ….well….cause I’m still dumb with all this….

so do they choose drivers and then calculate….well ok we need a ported cabinet of 40 liters for the drivers to work optimally and have a flat response. So we are going to make it 38 liters and add lining/stuffing to have wiggle room to add another 2 liters of virtual volume.
Troels mentions it here
http://www.troelsgravesen.dk/SBA-16-MTM.htm

is that kinda sorta how they do it?
along with their bracing or cabinet design Philosophy?
because they don’t use bracing. Only bitumen and rely on the stiffness and thickness of the MDF they are using.
 
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#34
It’s weird because even the internal lining of the foam isn’t done ‘ perfectly’

that is, some of the foam lining doesn’t even reach the bottom. So two pieces of foam completely cover all the way to the top of the cab, but at the bottom there is around an inch gap between the foam and the bottom.

all the speaker building plans I’ve seen have either felt lining or whatever is being used being equally distributed along the cabinet walls.
 
#35
It's typical to design a closed box knowing that with stuffing it won't need to be as large, simulators can handle that these days. Some are less keen to stuff a ported box as I think I mentioned before.

By the way, it works better away from the walls.
 
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