Hi:
I need help calculating the size of a enclosure speaker. I want to build a pair of speakers with a woofer and a tweeter each, with a 2 way crossover. I want to get the components at www.parts-express.com, I've seen some I like but when I try the calculators available and I enter the parameters required in the boxes, at the end of the calculation I get a measurement indicating the volume of the box, but not actual dimensions.
How do I figure that out?.
Also, there is always a parameter missing in the component's information, the Qts value, how do I get that value?.
The speakers I want to build should sound like old Advent Classic speakers, I want them in a sealed enclosure.
Thanks.
I need help calculating the size of a enclosure speaker. I want to build a pair of speakers with a woofer and a tweeter each, with a 2 way crossover. I want to get the components at www.parts-express.com, I've seen some I like but when I try the calculators available and I enter the parameters required in the boxes, at the end of the calculation I get a measurement indicating the volume of the box, but not actual dimensions.
How do I figure that out?.
Also, there is always a parameter missing in the component's information, the Qts value, how do I get that value?.
The speakers I want to build should sound like old Advent Classic speakers, I want them in a sealed enclosure.
Thanks.
"Should" and "will"sound like an advent classic are two different things. It'll take quite a bit of time and fiddling to get these new parts to sound like a speaker of yesteryear, if you actually could. I'm not saying because the parts are different but because you woould have to know all the specs and frquency response characteristics as well as phase. And that's just the drivers, the x over would be quite tricky to get exact. Plus you would need a speaker T/S tester to make sure your new driver specs are exact for the calculating program. Most good programs will fill in missing T/S specs to a certain point. There are also box dimension calculators on the web as well. I just usually take the size of the space I'm going to put the box in and adjust the dimensions to fit. 1 cu.ft equals 12"*12"*12" or 1728 cu.inches.
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There is no guarantee this will work, or maybe there are other ways to do it, but it stands to reason that if you want to duplicate the 'sound' of your favourite speaker you could start with a box that has the same height and width as the original. The depth can depend on your size requirements. Use a woofer of the same size as the original, having the same cone material, and in the same location on the baffle.
Speaker Qts is one of the main parameters that should be available from the manufacturer, and often offered by sites that are selling them. Qts can be left out in cases where certain other related parameters are used in its place.
Speaker Qts is one of the main parameters that should be available from the manufacturer, and often offered by sites that are selling them. Qts can be left out in cases where certain other related parameters are used in its place.
Thank you very much for your replies.
What I meant mentioning the Advent Classic or Advent Large as some people calls them is basically that I want some simple two way speakers with a 10" or perhaps 12" woofer, a tweeter and a 2 way crossover in a sealed box with good sound, I understand that if I want the exact same sound the best way and probably more economic one to do it would be to buy a used pair of Advents, but I want to build them myself. They don't have to have the exact same type of sound, as long as their sound is good and balanced, that is the reason why I would like to learn how to use these "speaker calculators" properly. I made a mistake in my initial post, the parameter that is always missing in the speaker's specifications is not the Qts, it is the Qtc or "Actual System Q", I have checked many speaker components at www.parts-express.com and none of them have that parameter in their specs. The calculator I have been playing with at www.diyaudioandvideo.com/Calculator/Box/ has the box for filled with .707, I assume this is like a starting point, but if you guys can tell me how to determine the correct Qtc I'd appreciate it very much.
Thank you.
What I meant mentioning the Advent Classic or Advent Large as some people calls them is basically that I want some simple two way speakers with a 10" or perhaps 12" woofer, a tweeter and a 2 way crossover in a sealed box with good sound, I understand that if I want the exact same sound the best way and probably more economic one to do it would be to buy a used pair of Advents, but I want to build them myself. They don't have to have the exact same type of sound, as long as their sound is good and balanced, that is the reason why I would like to learn how to use these "speaker calculators" properly. I made a mistake in my initial post, the parameter that is always missing in the speaker's specifications is not the Qts, it is the Qtc or "Actual System Q", I have checked many speaker components at www.parts-express.com and none of them have that parameter in their specs. The calculator I have been playing with at www.diyaudioandvideo.com/Calculator/Box/ has the box for filled with .707, I assume this is like a starting point, but if you guys can tell me how to determine the correct Qtc I'd appreciate it very much.
Thank you.
It looks like a good adventure.
I expect a closed box to be in the right thing/alignment.
But, you go with modern drivers I suppose. So you lose the "old" sound and will "tune" a new driver to a standard speaker.
Now, what size OF BOX/DRIVER are you looking for (driver: 4/5", 6", 8", 10")? A lot of questions will arise being cheaper also buying the vintage drivers from $Bay.
Then the idea of building a box and then finding a driver might not be the best one, unless you know the sound you want. I would like to know the approxim. dimensions first relating if the loudspeakers are Floorstanding vs Stand/Bookshelfs (and by the way say now, for a start, if don't want to use subwoofers with them). A couple of traditional drivers come to mind, and you can go with the paper/pulp sound (Here a paper 10" http://www.madisoundspeakerstore.com/approx-10-woofers/seas-prestige-a26re4-h1411-10-paper-cone/) or the polycone type (pp or polypropylene ) with the old mythic sound vintage material being the Bextrene (Kef and all) but attention it is an accurate low power driver, and be careful too with the profile of the cone to have in mind, and a silk dome tweeter will probably be your target. More modern drivers (cone) are also made of sandwich materials like the Focals. If you want to make a point also give some attention to the type of chassis (from pressed steel and up). You have a lot to read and should give a look at modern vintage style builders like Harbeth, UK to mention just one.
Advent - The Classic Speaker Pages Discussion Forums
New Large Advent Loudspeaker: A New Vintage Reference - New Large Advent Speakers - Epinions.com
Woofer - Wikipedia, the free encyclopedia
The Art of Speaker Design, Part II
6moons audio reviews: Music Lovers Series "An Auditorium 23, Harbeth. Leben, Shindo and Sony System"
NSMT Professional Studio Monitor Loudspeaker - nsmt-loudspeakers.com
MATERIALS* used for SPEAKER production
http://www.humblehomemadehifi.com/download/Humble Homemade Hifi_USB Mk-II_copy.pdf
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Qtc is for the complete system, box + driver, so you won’t see it on any driver spec sheet, it is something chosen by the designer.
Here is an explanation of how different Qtc values affect the response:
Speaker Box Enclosure Designer / Calculator Help
Unibox is one of the best calculators around
UniBox - Unified Box Model for Loudspeaker Design - Kristian Ougaard
Here is an explanation of how different Qtc values affect the response:
Speaker Box Enclosure Designer / Calculator Help
Unibox is one of the best calculators around
UniBox - Unified Box Model for Loudspeaker Design - Kristian Ougaard
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