Oh, ok. i will get some unipolar capacitors then, they are very cheap anyway. Cone breakup i will ignore for now and deal later.
I made a new tiny speaker from some leftover speaker i had. I only used 1 speaker and it is very loud. It plays quite decent. But as soon as i close the sides, it sounds kinda strange. There is more bass but also i think playing frequency shifts. I have perfect pitch so i can say that for instance it changes from playing note C into playing C major. Also its kind of echoe-i, i mean u can hear that its in a pvc pipe. Is this normal, can i make it sound better ? This pvc pipe is perfect because it saves me so much work as opposed to a round pipe. I added an image so u will know what i work with. I might add that i didnt notice that when i used the round gray pipe, which is alsopart pvc but looks more like ordinary plastic. U can tell also when u cut it with rotary tool - the gray pipe, when cutting, things were flying at high speed into my face. While at this pipe, there is only tiny dust.