Pico Lino downscaling

[4real]

I would love to give my parents a nice speaker as a christmas present. They use there terribel wireless plastic speaker at the moment (small black plastic sqweaky things). Since the wireless option is great, I want to stick with it. So I'll reuse the transmitter and amp, and build a new compact speaker with it.

My eye fell on the Pico Line Transmission line for the German magazine Hobby Hifi:

http://www.lautsprechershop.de/hifi/picolino.htm

It uses a Vifa 10 BGS 119/8, and a small filter.

There is just one problem: I'm affraid the box is a little to big. So I sant do downscale it a bit. The problem is: how do I do that? I'm not realy into transmission line, so I'm not sure what to do with the line if the box gets narower, and lower. I guess the line length should stay the same.

So, what should I do to scale the box down, without to mutch bass performance loss?

Here a a few drawings:

http://www.audiocomponents.nl/speake...ico-Lino_1.jpg

It would be nice if it would fit into 25x30x16 cm (DxHxW)

I could make a 6 liter BR, but a transmission line is more interesting, and if it cannot be made much smaller, it is still an option

[4real]

No replies

Well, I descided to go with a 5 liter BR version. I'll use the Pico Lino notch

Should look something like this:



16x25x20 cm

[joensd]

Hey don´t give up so fast!
You could use Martin´s software to play around and see if you can create something appropriate for your given speaker size.
You certainly will need one fold and I´m not very familiar with simulating those in his software.
Just didn´t investigate, should be piece of cake.
Can you give me the T/S-parameter?
Can´t seem to find a source with all the values.

Quarter Wavelenght

[4real]

Yes, I played arround with the mathcad worksheets a bit, but i never seem to get anything near the speced curves... (also in the orginal design). TSP should be easy to find, just search with google for the driver type number. There are not that many hits .

BR seams to be a better choise for now. Or someone should give me a helping hand with a nice transmission line that would fit inside the current box...

[4real]

Well I managed to get scans of the orriginal Picolino article in the HobbyHifi. I was very impressed and gave some new insights

The thing that confused me most is that they used AJHorn as simulation software, and that the simulaties were vertually identical with the measurements! But now I have more acurate date (and some new TSP), I should be able to simulate the thing with the mathcad worksheets. Well, no, far from it The mathcad simulations don't look like the AJHorn simulation at all. In Mathcad the drop is much more gentle and starts at about 150 Hz, while AJHorn models a steep drop starting at about 60 Hz. And i heard so many good things about the mathcad sheets... strange... They might not work ik al situations.

Here screenshot form the AJHorn website:



Now, for my smaller box I would like to do some simulations on my own, but I don't have AJHorn, and the demo is somewhat non-usable. I could buy the software, but I would like to realy test it out first.

I'm wondering if there is somebody here with AJHorn who could help me a bit with my dilemma... Would me great