I prefer well teased acoustastuff… for lining i like th edense stuff (NLA) the insultion needs to be teased and pulled apart.
dave
dave
Why don't speaker builders just use materials that are used in sound absorption panels?
will that over dampen?
will that over dampen?
Speaker builders cannot predict the acoustics at the user location, that is why.
Or their musical choice.
The idea is faithful reproduction, anything that changes the sound is actually - technically speaking - distortion.
Good or bad is the listener's decision.
Or their musical choice.
The idea is faithful reproduction, anything that changes the sound is actually - technically speaking - distortion.
Good or bad is the listener's decision.
who me?
lol
nah I’m just looking to make some incremental ‘ improvements’ if I can on a speaker I already like.
lol
nah I’m just looking to make some incremental ‘ improvements’ if I can on a speaker I already like.
We are diying our own specifically for the task with more appropriate characteristics.
dave
that is what I am trying to ‘ improve ‘ upon.
wonder what QAcoustics uses as foam in their 500 model. That grey porous stuff
wonder what QAcoustics uses as foam in their 500 model. That grey porous stuff
You already have three layers of damping: wooden something, bitumen and foam.
All three have different characteristics of damping.
If the bitumen is stuck to the cabinet, it will act as a brace.
There is little left to achieve here.
Furnishing foam, and duct insulation are made in different densities and materials, you can look them up and decide which is suitable.
All three have different characteristics of damping.
If the bitumen is stuck to the cabinet, it will act as a brace.
There is little left to achieve here.
Furnishing foam, and duct insulation are made in different densities and materials, you can look them up and decide which is suitable.
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I agree there is little left to achieve in terms of bracing the ProAc DT8's heavy and inert enclosure.
The compact enclosure is only 38.5" h (on spikes) x 7.6" w x 9" d and weighs in at a not insubstantial 26 kg.
The enclosure’s walls use differing thicknesses of MDF to spread resonances. They are said to be "extensively braced" and are obviously heavily damped.
ProAc's philosophy is not to use 'internal bracing' of the type you are considering.
By "extensively braced", I assume they are referring to the general construction (jointing etc.).
By "extensively braced", I assume they are referring to the general construction (jointing etc.).
By the way impedance graphs looks like, very small appearing wrinkles at about 300/600Hz, might point to air resonances living there, so light volume filling with poly/wool wadding, while leaving original foam intact, could improve the sound a tiny bit.
And each damps somethign different. The crap on the sides of the box damps the box walls (and lowers the potential resonance as well as broadening the Q), opposite of what bracing does. The foam damps the airspace.
The 2 are quite different tasks.
dave
Like I said, they are all having different characteristics, and will achieve different results, the sum of which is the final sound.
They are all damping sound waves made by the drivers, are they not?
Instead of one damper, you have three...
The wooden surfaces have a resonant frequency, the bitumen another, and the foam a third group of frequencies.
One will act on boom, the foam will act on the higher frequencies, am I correct in my assumptions?
Please correct me if I have made a mistake, I am nowhere as experienced as you are.
So only a little tweaking should be done, seems a well made unit.
They are all damping sound waves made by the drivers, are they not?
Instead of one damper, you have three...
The wooden surfaces have a resonant frequency, the bitumen another, and the foam a third group of frequencies.
One will act on boom, the foam will act on the higher frequencies, am I correct in my assumptions?
Please correct me if I have made a mistake, I am nowhere as experienced as you are.
So only a little tweaking should be done, seems a well made unit.
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Actually, in Engineering school, there are plots of spring and damper combinations, and how they react to inputs.
Subject was Control Engineering, and the famous or preferred text author was Ogata.
The most obvious and practical example, a motorcycle shock absorber, did not occur to any of my teachers...it is a spring and a damper in parallel.
Subject was Control Engineering, and the famous or preferred text author was Ogata.
The most obvious and practical example, a motorcycle shock absorber, did not occur to any of my teachers...it is a spring and a damper in parallel.
Maybe the sides, top / bottom and back are in different thicknesses of MDF...
That could work for damping purposes.
That could work for damping purposes.