Share ko lang experience ko with my Konzert speakers.
Didn't get to use the said speakes for 6 months and stored them in my bodega, dry and ambient naman ang temp. I have to pull it out for the New Year 2010 big bang night of Dec 31 which I usually do naman every year. Used it with amplifier rated 600W per channel, pero half lang ang output para 300W lang ang labas. After DJ'ing for 1 hr, heard na pumapalakpak na ang speakers, ang masakit wala pang 12mn. Saw some foam fibers at the front cover and surprised to see nothing was holding the speaker diaphragm (round-paper like), sama ng tunog. Have to turn it off the sound system and bring out my old speakers rated 200W so medyo override na ako ng mga paputok that time. Haaay...galing ng pasok ng new year ko, hehe...
Sometimes you really have to shelve out some good amount of cash for long lasting and quality speakers. Bought it cheap but you get the price worth after some time and actual usage (mga >2 years na). 500W ang rating as per label pero saw 250W lang yung 10" speaker nya. Substandard din yun wires. Attaching pics for your reference.
Hanap na lang ako ng same size speakers to replace it since ok naman yung pagkagawa ng baffles nya. Have to rewire na rin, since manipis lang ang ginamit na wiring.