t/s parameters relations

lolojr1

Member
2004-10-03 5:20 am
i am curious about the relations of the t/s parameters of any speaker.
i have seen some people on here talk about coating the cone with laquer or that "wet look" stuff what does this do to the parameters?

i am currently trying to build an enclosure for 2 subs to use in a db drag vechicle
i got a recomendation from the owner of the company whos equipment we are using and was talking to him about how to make the most of what i have and he recomended raising the fs to something closer to the resonance of the port in the box to make the load on the amps not so high.
is this a resonable idea ?
how would i go about doing this?
i know that adding weight lowers the fs and i cant cut the weight of the soft parts down any way.
i just got the woofer tester and i will measure the subs to get an accurate set of parameters and go from there.
any one that has any ideas on this or any other things that could help please tell me i would really like to hear them.
 
Heavier cone,lower resonance,and lower Sensitivity.

and he recomended raising the fs to something closer to the resonance of the port in the box to make the load on the amps not so high.
Buy the correct woofer which has the Fs in the right place. Get modeling software'winisd pro' from linearteam.dk and experiment.

Perhaps different suspension will adjust Fs but that may not be desirable if the cone is already heavy.
 

lolojr1

Member
2004-10-03 5:20 am
hi i ask these questions here because i am an audiophile and build more alont the lines of soundquality stuff for my house and most of the cars i have hadin the past but when a friend found out my intrest in audio he kind of got me into helping him (and here i am )

i know that ading weight to a speaker lowers the fs so how do i raise it ?
what other parameters do i have control of when building a woofer other than fs and xmax?

i have bassbox pro termlab and the woofer tester 2 and a plie of speaker parts to build my own woofers coils, spiders, cones, dustcaps, and 2 basket /magnet setups for a resonant engineering mt 18"

i come here bacause i read here all the time and i know the knowledge is abundant and free flowing as long as i ask the right questions but i know dbdrag racing isnt looked apon to highly around here but those kids are all asking the same thing over and over "what is the baiggest sub and amp i can buy for 100$ never anything i can learn from

thanks
 
i know that ading weight to a speaker lowers the fs so how do i raise it ?
By doing the opposite. TO design speakers you need to know the equations which effect each other. Guessing simply wont do,its a hit or miss affair. Note that the loudspeaker spider will determine the Vas/CMS parameter.You dont require a low Fs for SPL woofers,and also consider that excursion will be minimal at port tuning. For the final last few dB it comes down to the power compression and large signal parameters-stuff that only the best companys know about.

A sensitive speaker will have a low Qts motor,and a low Qts motor will have a lack of bass extension.
Where as an inefficient speaker will have a higher Qts motor,and more extension. The interesting thing is that on the small signal scale,the inefficient speaker,with the same volume as the efficient one can be made to 'boom' or resonate on the right enclosure to be the same sensitivy at the port tuning. Resonant and loud.