I've just found an old ( very old ) woofer named as
RCF L12P 50T
It is a 12" 35-50 W , 8 ohm , i think made in 1970-80 years.
RCF was an italian factor, now aquired by Mackie.
Has somebody the Small's parameter of this??????
RCF L12P 50T
It is a 12" 35-50 W , 8 ohm , i think made in 1970-80 years.
RCF was an italian factor, now aquired by Mackie.
Has somebody the Small's parameter of this??????
Even if someone had the T/S params, they would have changed by now - the suspension can loosen a lot over the course of 10 years+
Measure them yourself with speaker workshop, or you can get by with a DMM and your soundcard equipped computer if you download a signal generator program
search for nchtone - one of the best...
Measure them yourself with speaker workshop, or you can get by with a DMM and your soundcard equipped computer if you download a signal generator program
search for nchtone - one of the best...
But since it is so old then it wouldn't end up in hifi gear anyway. So then the original values could be used as a starting point.
/Marcus
/Marcus
May be i can measure myself t/s parameters but i don't know the procedure !!!
I can test with a sin wave, square and sweep of both but some procedural problem are present :
-I need a microphone for measure and not for voice or similar
-Even If i use a good voice micropone it can modify the data
-I know the relation between T/S param and the "virtual" electric param for simulation, but not the ones between "what i read from instrument " and T/S param.
I have a lot of instrument ( oscilloscope, wave generator, audio microphones, my PC ) but i don't know " how to use ".
I can test with a sin wave, square and sweep of both but some procedural problem are present :
-I need a microphone for measure and not for voice or similar
-Even If i use a good voice micropone it can modify the data
-I know the relation between T/S param and the "virtual" electric param for simulation, but not the ones between "what i read from instrument " and T/S param.
I have a lot of instrument ( oscilloscope, wave generator, audio microphones, my PC ) but i don't know " how to use ".
You won't need a microphone for most of the measurements, so don't worry about that.
You should get your hands on The Loudspeaker Design Cookbook by Vance Dickason. It has a complete chapter dedicated to measurements of loudspeakers.
But, before you start off you should ask yourself if it is worth the effort. If the driver is really old then maybe you're better off buying a new one? Just a thought but I don't know the condition of the driver so...
/Marcus
You should get your hands on The Loudspeaker Design Cookbook by Vance Dickason. It has a complete chapter dedicated to measurements of loudspeakers.
But, before you start off you should ask yourself if it is worth the effort. If the driver is really old then maybe you're better off buying a new one? Just a thought but I don't know the condition of the driver so...
/Marcus
My interests about this woofer aren't to build something like a hi-fi speaker, but only to test and to do some experiment.
When i'll have enough money i'll buy two good woofers, but before i'd like to know something about loudspeaker construction, so to avoid to spend a lot of money.
Many project are shown in internet but the components are'n often allowable in Italy ( whre i am ) and i don't know how they play.
My two woofers come to my old system (so i know how they play now), but the old boxes are bad realized and so i'd like to know what happen if i do something different.
But without a starting point it's hard to do..........
Lanz.
When i'll have enough money i'll buy two good woofers, but before i'd like to know something about loudspeaker construction, so to avoid to spend a lot of money.
Many project are shown in internet but the components are'n often allowable in Italy ( whre i am ) and i don't know how they play.
My two woofers come to my old system (so i know how they play now), but the old boxes are bad realized and so i'd like to know what happen if i do something different.
But without a starting point it's hard to do..........
Lanz.
Maybe there are some webpages that describes the procedure of TS measurement, but I haven't found any. Which is to bad because it would have been interesting to compare Dickason's methods with someone else's.
So for now I can only point to his book. Maybe you can find it in the city library?
/Marcus
So for now I can only point to his book. Maybe you can find it in the city library?
/Marcus
My city library is very good for litterature, story and languages, but for engeneering themes are very bad.
I'm a mechanic engeneer student and in my university there're a lot of low level acoustic and audio manuals, but nothing about measurement.
I've found a copy of the cookbook inside a e-commerce site so, if things seems to be bad, i could buy it in this way.
Thanks for your suggestion.
Lanz
I'm a mechanic engeneer student and in my university there're a lot of low level acoustic and audio manuals, but nothing about measurement.
I've found a copy of the cookbook inside a e-commerce site so, if things seems to be bad, i could buy it in this way.
Thanks for your suggestion.
Lanz
One way to measure parameters is here:
http://sound.westhost.com/tsp.htm
At www.diysubwoofers.org/audiolinks.htm there is a software called DPC at the bottom of the page that can guide you through the process.
http://sound.westhost.com/tsp.htm
At www.diysubwoofers.org/audiolinks.htm there is a software called DPC at the bottom of the page that can guide you through the process.
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