Hi,
I am in a process of desiging a proted 3-way system. I would really appreciate if any of you can provide me with the equations/ links to sites to calculate the box size, port size (if i want to design it based on the QTC - similar to designing sealed systems). I got some equations from the diysubwoofers.org site. But the equation is suited for only one type of design.
Thanx,
Venki😀
I am in a process of desiging a proted 3-way system. I would really appreciate if any of you can provide me with the equations/ links to sites to calculate the box size, port size (if i want to design it based on the QTC - similar to designing sealed systems). I got some equations from the diysubwoofers.org site. But the equation is suited for only one type of design.
Thanx,
Venki😀
Hi
Do you have the following ,
1 Multi meter capable of current measurements
2 Audio Signal generator
I have been over your problem with the Dainty driver ( the source is Chinese - though the source was limited by a strict price structure set up by the Indian Importer)
the qts is around 0.8
try this - press the cone inwards with a light force evenly spread over the body of the cone
next pull it outwards from behind - with roughly the same force applied before
you may find that the cone does not move upwards as freely as it doeas downwards
this is = that the suspension is non - linear - if this is so - or if you carefully study the spider if it appears pushed inwards - or the rollof the surround not symmetrical on both its edges - that is the outer edge and the one pasted to the cone
go in for a sealed cabinet as the above leads to distortion and poor phase responce etc.
you will find more information on non linearites - please search for my replies / threads here in Diy
as for the parameters - every one will advise to compare the results by :-
calculating manually & with your PC
If you have the above Multimeter etc. I can mail you the procedure pls mail me at tubu_cruise@yahoo.co.in or ill post it here on the thread as you like it
Suranjan Das Gupta
Transducer Design Engineer
Do you have the following ,
1 Multi meter capable of current measurements
2 Audio Signal generator
I have been over your problem with the Dainty driver ( the source is Chinese - though the source was limited by a strict price structure set up by the Indian Importer)
the qts is around 0.8
try this - press the cone inwards with a light force evenly spread over the body of the cone
next pull it outwards from behind - with roughly the same force applied before
you may find that the cone does not move upwards as freely as it doeas downwards
this is = that the suspension is non - linear - if this is so - or if you carefully study the spider if it appears pushed inwards - or the rollof the surround not symmetrical on both its edges - that is the outer edge and the one pasted to the cone
go in for a sealed cabinet as the above leads to distortion and poor phase responce etc.
you will find more information on non linearites - please search for my replies / threads here in Diy
as for the parameters - every one will advise to compare the results by :-
calculating manually & with your PC
If you have the above Multimeter etc. I can mail you the procedure pls mail me at tubu_cruise@yahoo.co.in or ill post it here on the thread as you like it
Suranjan Das Gupta
Transducer Design Engineer
venki said:
There is no way to design a ported box based on Qtc. Qtc is only defined for a closed box system. The equations at diysubwoofers.org are correct. They do represent only one way of doing things - you are free to design a box with whatever Vb, Fb you want as long as it meets your target response.
You need to know Fs, Qts, Vas at a minimum to figure out a Fb, Vb to start with.
Measuring parameters is easy, you just need a voltmeter, a ~10 ohm resistor and your computer soundcard (download a signal generator program). Do a search for a program called DPC (Driver Parameter Calculator) and it will guide you through the steps.
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