I am building concrete speakers with the same drivers but have them ported. Using a cylindrical mold and cast the front separately. I have some ideas how to treat the concrete when finished but curious what you have been using. I have been hinted to use soluble glass. I can say that I am building a 3 litre box with approx 20 mm walls and have been using about 10 kg och (mixed) cement. Reinforcing with glass wool. Also I used a dash of acetone to get a hole in the filling and from there carve out the rest with a sharp knife.
Thank you! If I had the time and money, I would probably be building speakers all the time. But because I'm in college, I cant build regulary. So to answer your question: Yes! But I can't say when :)
Would have been nice to have some details of what you were doing, I would also recommend some black screws so you cant see them. If you do want to see them, some shiny nickel plated ones or brass ones
Great work! How much do they weigh? I am thinking of making the baffle of my next speakers out of concrete, but I am a little worried about the weight.
Thank you! One speaker casing weighs about 7kg/15lbs... So pretty heavy, but not too heavy in my opinion! They sound really good, unfortunately the built-in microphone of my camera doesn't really capture it :)
I went with a sealed enclosure, because its my first concrete speaker designand I wanted to keep it simple. Also I learned, that with that size (rather small) and price range, the difference wont be really noticable. For more info on enclosure designs, I recommend the following video: ua-cam.com/video/ljuHHVznJJY/v-deo.html Thanks for your comment! :)
Hey, sorry for the late answer! The inner part of the concrete form had exactly the same measurements as the wodden front baffle :) So naturally it fit perfectly. Was that what you meant?
That's what the straws in the concrete casing are for :) I didnt want to drill a hole in the finished casing, so I put the straws in and pulled them out. Then I attached some binding posts, similar to that: www.amazon.de/Hifi-Lab-Lautsprecher-Bananen-Buchse-Anschlussklemmen-vergoldet-transparent/dp/B01FQZTL1M/ref=sr_1_16?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=lautsprecher+buchse&qid=1603619864&sr=8-16 For the sound test clip at the end, I purposefully arranged the speakers, cables and amp so that you cant see them, because I thought it looked better.
@@concreteeverything1605 You might be surprised at how much of a difference a port can make. It should extend how deep the driver can reproduce by quite a bit. If the bass is as bad as you suggest, and rolls off at say 125Hz, a port could bring that down to 85Hz as an example.
Making a concrete cabinet for speakers that don't produce much low end bass seems a bit over kill... The whole idea is to reduce cabinet resonance but it's hardly producing any with that small driver.... A beefy over engineered small woofer/ tweeter combination would of been better IMO 🙂
Finally a build with a sound demo!! Great build!!!
Awesome way to build it
Geile Idee, geile Umsetzung! ...und ein echt klasse Ergebnis, sieht top aus!
Great job... nice
I am building concrete speakers with the same drivers but have them ported. Using a cylindrical mold and cast the front separately. I have some ideas how to treat the concrete when finished but curious what you have been using. I have been hinted to use soluble glass.
I can say that I am building a 3 litre box with approx 20 mm walls and have been using about 10 kg och (mixed) cement. Reinforcing with glass wool. Also I used a dash of acetone to get a hole in the filling and from there carve out the rest with a sharp knife.
Nice build! Can we expect more Concrete projects / speakers builds?
Thank you! If I had the time and money, I would probably be building speakers all the time. But because I'm in college, I cant build regulary. So to answer your question: Yes! But I can't say when :)
You can used lightweight concrete (1600kg/m3) to lessen the weight..
Would have been nice to have some details of what you were doing, I would also recommend some black screws so you cant see them.
If you do want to see them, some shiny nickel plated ones or brass ones
Great work! How much do they weigh? I am thinking of making the baffle of my next speakers out of concrete, but I am a little worried about the weight.
Thank you! One speaker casing weighs about 7kg/15lbs... So pretty heavy, but not too heavy in my opinion! They sound really good, unfortunately the built-in microphone of my camera doesn't really capture it :)
@@concreteeverything1605 thanks for the response. The weight is really OK for concrete speakers.
Did you ponder adding a port for increased bass extension? I've never messed with speaker box software before.
I went with a sealed enclosure, because its my first concrete speaker designand I wanted to keep it simple. Also I learned, that with that size (rather small) and price range, the difference wont be really noticable.
For more info on enclosure designs, I recommend the following video:
ua-cam.com/video/ljuHHVznJJY/v-deo.html
Thanks for your comment! :)
How did you give the border edges for the front baffle to fit on them? So curious
Ask a skilled carpenter/mason. He knows how it is done @YashasvSaluja.
Hey, sorry for the late answer! The inner part of the concrete form had exactly the same measurements as the wodden front baffle :) So naturally it fit perfectly. Was that what you meant?
I never saw you add binding posts, nor do I see wires going to the speakers at the end of the video.
That's what the straws in the concrete casing are for :) I didnt want to drill a hole in the finished casing, so I put the straws in and pulled them out. Then I attached some binding posts, similar to that:
www.amazon.de/Hifi-Lab-Lautsprecher-Bananen-Buchse-Anschlussklemmen-vergoldet-transparent/dp/B01FQZTL1M/ref=sr_1_16?__mk_de_DE=%C3%85M%C3%85%C5%BD%C3%95%C3%91&dchild=1&keywords=lautsprecher+buchse&qid=1603619864&sr=8-16
For the sound test clip at the end, I purposefully arranged the speakers, cables and amp so that you cant see them, because I thought it looked better.
Cool, but you forgot to port it.
Didnt forget, just didnt port it ;) With speakers this size, with already ignorable bass, you dont need to put a port in.
@@concreteeverything1605 You might be surprised at how much of a difference a port can make. It should extend how deep the driver can reproduce by quite a bit. If the bass is as bad as you suggest, and rolls off at say 125Hz, a port could bring that down to 85Hz as an example.
How many bags of concrete did you use for this?
Im very sorry, but I havent written down how much I used :( One speaker casing weighs around 7kg/15lbs, maybe you can calculate it from that!
Making a concrete cabinet for speakers that don't produce much low end bass seems a bit over kill... The whole idea is to reduce cabinet resonance but it's hardly producing any with that small driver.... A beefy over engineered small woofer/ tweeter combination would of been better IMO 🙂
Has someone tried AAC ( AUTOCLAVED AERATED CONCRETE) for bass boxes!