The process of fiber filling a cabinet is definitely not an exact science. If you want to target a specific Fb or Q, then you will have to pay the price of trial and error.
IMHO, for closed box stuffing, fiberglass is the best. It will get you a lower Fb than the other standard stuffing materials. The reason? fiber fineness.
IMHO, for closed box stuffing, fiberglass is the best. It will get you a lower Fb than the other standard stuffing materials. The reason? fiber fineness.
Regarding the effects on maintaining air temperature (for increase in compliance, to have effects on low frequency behaviour), the idea is to have as much air as possible in contact with the fibres. I doubt the nature of the fibre is of much importance, but density will matter to some degree.
In terms of converting air disturbance into heat, it's pretty obvious that you need to have fibres which will interact with air flow, such that they vibrate against neighbouring fibres, and with a high degree of friction. So, stiffness, fibre diameter and roughness will matter. Empirical evidence seems to point to long-fibre wool and fibreglass.
Suggest you find and study Small's 1972 seminal AES paper on closed box loudspeaker systems part 1. Analysis. Box stuffing and its effects are well covered.
That was covered that in the development of the capacitance. It is associated with the value of k. Stuffing tends to make the compression/expansion process isothermal driving k towards 1.0. The absence of stuffing tends to driver it towards adiabatic and reversible, k = gamma. In reality, you can never achieve either.
Now, if you want to consider that capacitance changes as the pressure in the box changes then that will introduce nonlinearity. It will have little effect on the box alignment but may introduce distortion for larger excursions. But generally less distortion that the driver itself.
John.K,
Your interventions on this subject are just perfect! Like many I knew that it virtually increased the volume but for the first time, I clearly understand the logic. Thank you for that !
All that remains is to talk about the damping of sound waves in relation to the density of the materials and their thickness !?
Your interventions on this subject are just perfect! Like many I knew that it virtually increased the volume but for the first time, I clearly understand the logic. Thank you for that !
All that remains is to talk about the damping of sound waves in relation to the density of the materials and their thickness !?
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