a split tqwp speaker for my chipamp

[Leonidas]

To everybody on the forum,

As a job, I work with children(10-18 years old) and one day (about a year ago) I decided to do some nice "handwork" with some kids. So I have to design a simple to build loudspeaker and a chipamp for them. For now I'm convinced that everybody can build these speakers because all the kids, girls and boys in the age of 13-15, have now finished the project. There is one little problem : the finished speakers don't get to the children's own room; most parents ask me for the drawings to build them for their own use and until then they want to keep the children's speakers . Which means to me that they are fun and sounding pretty good.
I will post some pics on the forum, because they are easy to build and will work with a lot of 5 inch speakers ( I putt a lott of effort in creating a full range out of a bass speaker but didn't quite succeed) I tried several speaker units in the boxes.

Hope everybody has some fun.

Dear moderators ;

I do hope that this thread is allowed on the chipamp forum.
My basic idea was ; That it is quit on the forum, so some synergie design probably give a bit of live back to the forum.
We did try a Philips class D Home theatre amp but the speakers sounded a lot beter with a chipamp ( basic NI Lm 1875)

[Leonidas]

Another pic

[Leonidas]

Test setup ; mini chipamp, lm 1875, and sony minidisk

[Leonidas]

speakers I tried : B110B, Seas p14rcy, car speakers , small 3 inch visaton, and severat others.

[Leonidas]

small visaton ; sounded very well ; more bass then you can imagine !!

[Leonidas]

We did some measurements. Used a Technics freq.anal. and a realistic soundlevel meter.
We all heard no distortion with peak levels up to 100dB/1meter.
Freq. pic. added.

[Leonidas]

tweeter setup box , only 2,2uF and 3,3 ohms in series.

[CarlosT]

Wonderful project, Leonidas. I'm doing something for the kids, too...a retro vintage Fender look cabinet with a single Audax 5.25" coaxial powered by a single LM3875 GC kit. My biggest problem now is deciding on the best approach to sum the stereo channels from the iPod into one mono input.

[CarlosT]

The cabinet internal dimensions are approx. 8" x 4" x 12" so a very cool little compact thing. It will be aligned in a classic BB4 boombox ported alignment and the F3 cutoff will be a very low 51 Hz.

[Leonidas]

Hello CarlosT,

Very satisfied, myself, after working with kids.
Any pics or drawings of your project??
Why don't you try the mono(just one lm3875)?
There also is a lot of stuf on the forum : how to bridge chipamps.
You can perform a search.

Whish you a lot of joy with the kids!!
One problem I had was working with 230Volt,
I decided that they could do everything on their own , ecxept rhe seperate case including the tranny.
This part had to be inspected by me , before they may use it. Just for safety reasons.

If I can be of any help, just let me know !
For children (and adults who are trying to inspire children)I'm always there.

One more pic of a modded speaker, very useble as full rang and guitar use.

Good luck, Leon