I'm designing my first full range system. I have almost settled on the Seas Excel 8" driver (this week anyway!) and the Stage Accompany SA8535 (budget permitting). I realise I may be taking a little too much on for a first design, but I like a good challenge.
I'm also aiming to make the cabinet egg shaped for its theoretical diffraction and standing wave properties - or lack of
. The driver is to be mounted on the larger rounded end of the egg (for aesthetic purposes), and so I can not fit any tweeter in the same cabinet.
Here are my questions...
1. Can I build the mid range cabinet without having to worry about the crossover and other drivers (woofer/tweeter) at this point? My understanding for a new design is to select the drivers first, then design and build the cabinets around the drivers, then figure out how to blend everything together as seamlessly as possible (using a crossover) to make sweet music! How far out am I in my simplistic view? 😕
2. I assume that I can't use the published Seas T/S values, especially when considering the enclosure shape. What software (free is alway better 😉 ) can I use to identify my driver values?
I guess what I'm looking for is an ordered list of things to do to build a speaker. i.e.
a) select the driver units
b) measure T/S values (using software (s) for example)
c) model speaker using T/S data in enclosure (e)
d) design XO
...and a bunch of very nice people help me do it... 🙂
I'm also aiming to make the cabinet egg shaped for its theoretical diffraction and standing wave properties - or lack of
. The driver is to be mounted on the larger rounded end of the egg (for aesthetic purposes), and so I can not fit any tweeter in the same cabinet.Here are my questions...
1. Can I build the mid range cabinet without having to worry about the crossover and other drivers (woofer/tweeter) at this point? My understanding for a new design is to select the drivers first, then design and build the cabinets around the drivers, then figure out how to blend everything together as seamlessly as possible (using a crossover) to make sweet music! How far out am I in my simplistic view? 😕
2. I assume that I can't use the published Seas T/S values, especially when considering the enclosure shape. What software (free is alway better 😉 ) can I use to identify my driver values?
I guess what I'm looking for is an ordered list of things to do to build a speaker. i.e.
a) select the driver units
b) measure T/S values (using software (s) for example)
c) model speaker using T/S data in enclosure (e)
d) design XO
...and a bunch of very nice people help me do it... 🙂
www.speakerworkshop.com
for measurements.
For making your own First system(which i have never done)
i would build some speakers that other ppl have used eg a vifa mid+tweet
you can determine
-Fs easily
-Q after some calculations,and
-Vas with a test box.
you may need Zobels and everything on ur xover, probably ul need 2nd order,and probably active depending on what u wnat.
i would expect to have any chance of making it proper,you should use an expensive modeling program, that does full range,like winisd does for subs,but more complex and includes more filters impedence correction etc etc...
http://sound.westhost.com >articles on bi amping etc and xover
for measurements.
For making your own First system(which i have never done)
i would build some speakers that other ppl have used eg a vifa mid+tweet
why not? it is good to test them though. a good manufacterers specs wil be close to real ones.
you can determine
-Fs easily
-Q after some calculations,and
-Vas with a test box.
you may need Zobels and everything on ur xover, probably ul need 2nd order,and probably active depending on what u wnat.
i would expect to have any chance of making it proper,you should use an expensive modeling program, that does full range,like winisd does for subs,but more complex and includes more filters impedence correction etc etc...
http://sound.westhost.com >articles on bi amping etc and xover
I've heard of manufacturer published T/S values deviating from a little to a lot. Isn't this what pair matching is about?
it depends on the brand,speaker,and how critical it is-if the Fs is up or down by 2hz
its not like we listen to music in perfect anechoic chambers with no room resonances. +-6db easily.
have you seen those concrete speakers? this guy on the net made little spheres with a small midrange in it.flat response +-2db or so
its not like we listen to music in perfect anechoic chambers with no room resonances. +-6db easily.
have you seen those concrete speakers? this guy on the net made little spheres with a small midrange in it.flat response +-2db or so
I'm designing my first full range system. I have almost settled on the Seas Excel 8; driver (this week anyway!) and the Stage Accompany SA8535 (budget permitting).
reminds me of this.
http://www.fmdesign.com/fmgriffin.htm
How to start a new design?
The SA8535 is my favorite tweeter. Before you do anything,
get a pair of them and connect them on the "test bench"
preferably electronic crossed over. I prefer a crossover frequency
between 2khz - 2khz, but the driver is able to go much lower.
Once you get familiar with the sonics, build a test box out
of cheap particle board for the midrnage that you chosen
and do some more listening tests to see if the midrange
and tweeter integrate well.
Originally, I was going to use the PHL1120 with the SA
tweeter, but after doing these bench tests, I liked the
PHL2520 mated with SA better. But individually, the 2520
was not as bright as the 1120. The magic happend during
integration of both.
If you are going to sink big cash, it's worth making some
cheap test boxes first before finalizing system design.
reminds me of this.
http://www.fmdesign.com/fmgriffin.htm
How to start a new design?
The SA8535 is my favorite tweeter. Before you do anything,
get a pair of them and connect them on the "test bench"
preferably electronic crossed over. I prefer a crossover frequency
between 2khz - 2khz, but the driver is able to go much lower.
Once you get familiar with the sonics, build a test box out
of cheap particle board for the midrnage that you chosen
and do some more listening tests to see if the midrange
and tweeter integrate well.
Originally, I was going to use the PHL1120 with the SA
tweeter, but after doing these bench tests, I liked the
PHL2520 mated with SA better. But individually, the 2520
was not as bright as the 1120. The magic happend during
integration of both.
If you are going to sink big cash, it's worth making some
cheap test boxes first before finalizing system design.
I've been interested in the designer of that system ever since building a variant of his 'Amighty Subwoofer'. So the choice of drivers has been quite influnced by his designs...
thylantyr, would be interested in seeing any info/pics you have with the SA...
thylantyr, would be interested in seeing any info/pics you have with the SA...
send me an email, I can send you some pics
of the SA driver, quality is webcam = ok.
lordpk@pacbell.net
my plan is to mini line source four SA per channel.
too expensive to do full line source.
heheh
of the SA driver, quality is webcam = ok.
lordpk@pacbell.net
my plan is to mini line source four SA per channel.
too expensive to do full line source.
heheh
Vikash- what are you saying?
i dont plan to make an 'almighty subwoofer'and i dont plan to call it 'almighty ' either..
it was either JBl 2226h , or 12inch shiva..(low eff) so i chose jbl
???😕
ofcourse.
i dont plan to make an 'almighty subwoofer'and i dont plan to call it 'almighty ' either..
it was either JBl 2226h , or 12inch shiva..(low eff) so i chose jbl
???😕
ofcourse.
I though i'd answer part of my own question (how to start designing you own loudspeaker) - in the hope of giving other beginners a starting point...
Extracted from the speaker workshop progam help...
Select Speaker Type
The most common types of speakers are 2-way (woofer and tweeter), 3-way (woofer, midrange and tweeter) and subwoofer (just a big woofer in a box).
Select Drivers
Based on the type of speaker, pick drivers to attain a flat response. You can prototype low frequency response (woofer and midrange) using the Enclosure commands before buying these drivers.
Buy the Drivers
Purchase the drivers and wait for them to arrive. Create Driver resources to hold the measurement data.
Measure the Drivers
For the woofer and midrange measure impedance in free air and in a prototype box Calculate T/S parameters for the woofer and midrange.
Design the enclosure
Use the T/S parameters to design a final enclosure for the drivers. Build one.
Measure the Drivers
Mount all of the drivers in the final enclosure and measure their impedance and frequency response.
Design the Crossover
Using the measurements from the real enclosure use the Network commands to prototype a crossover.
Test the crossover
Use the Signal commands to verify operation of the crossover with a load resistor, then attach the crossover to the drivers and test the frequency response of the system.
Extracted from the speaker workshop progam help...
Select Speaker Type
The most common types of speakers are 2-way (woofer and tweeter), 3-way (woofer, midrange and tweeter) and subwoofer (just a big woofer in a box).
Select Drivers
Based on the type of speaker, pick drivers to attain a flat response. You can prototype low frequency response (woofer and midrange) using the Enclosure commands before buying these drivers.
Buy the Drivers
Purchase the drivers and wait for them to arrive. Create Driver resources to hold the measurement data.
Measure the Drivers
For the woofer and midrange measure impedance in free air and in a prototype box Calculate T/S parameters for the woofer and midrange.
Design the enclosure
Use the T/S parameters to design a final enclosure for the drivers. Build one.
Measure the Drivers
Mount all of the drivers in the final enclosure and measure their impedance and frequency response.
Design the Crossover
Using the measurements from the real enclosure use the Network commands to prototype a crossover.
Test the crossover
Use the Signal commands to verify operation of the crossover with a load resistor, then attach the crossover to the drivers and test the frequency response of the system.
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