hello,
on the weekend i finally finished my latest DIY room acoustics project.
due to the absolutely great improvement the absorbers have - and the fact it was pretty easy to build them - i decided to share pics and further information.
moreover all that stuff wasn't too pricey.
for the housings i took standard book shelves by the swedish manufacturer ikea. they are pretty damn cheap (35 euro each) and easy to assemble.
the absorbing material is made of hemp fibres - due to possible health issues i wanted to use an organic material instead of fiberglass. it was quite a bit more expensive, but it think it was worth the extra dough. this particular hemp mats are 40mm thick, porous, and they have a gross density of 40 kg/cubic meter. pretty good...
in each shelf there are six sheets of the hemp, so the actual absorber is 24 cm thick.
i covered the front with wooden frames and linen fabric.
it took about 20 hours to build the four modules you can see on the photos.
for all the material i paid about 500 euro. it could have been roughly half of the amount if i had used fiber glass, since the hemp was so expensive (i know what you're thinking now...
).
although it took me some more time for research and getting the parts together.
the sonic results are outstanding. i didn't make any measurements yet, though.
the reason for me to build them was, that i had issues in the midrange caused by reflections from the wall behind the monitors. for what it looks like at the moment, this issue has completely been solved.
i'd be happy to answer any questions!