Concrete base Subwoofer build.

[Aatto]

I wanted to add more bass to my current setup, I live in a small flat so nothing big and earth shaking, I chose Dayton Audio 8" classic series driver.
I think this is the first time i didn't plan ahead and just went for it. I used some already cut 12x12 mdf boards i had laying around.
anyhow here we go :
it all start with this little fella :

Building the cabinet :

All sides came together it's sanding time

 

[Aatto]

Part 2 :

ready to paint :

done :

veneering time, got this beatiful veneer from ebay:

Staining :

 

[Aatto]

Part 3

I wanted something different rather than traditional feet or spikes, after a lot googling for ideas I decided to go with a concrete base.
Never worked with concrete before, so i watched a lot of youtube videos to make sure I do it right the first time.
It was easier than I thought, it did crack during moving and stuff but I ddon't mind that, it gives it some character:

sealed it with poly and the top part is ready to assemple :

 

[Aatto]

Part 4

Part 4 :
Finished product :

 

[GM]

GM

 

[MemX]

That looks great, good work!

Have you measured/graphed it?

 

[Aatto]

GM

That looks great, good work!

Have you measured/graphed it?

Thanks , it was fun working on it , I did measure it but cann't find the files at the moment.
but this is the bookshelf+subwoofer, before any eq just a 12db/oct cut at 250hz and same filter hi pass for bookshelf, almost flat across the board :

 

[LORDSANSUI]

Grats, nice work

 

[Aatto]

thanks

 

[chris661]

Build looks good. I'd recommend dropping the crossover down to <120Hz, though - it'll help the sub disappear better - having it running up to 250Hz would make it very easy to locate, and will pull the stereo image to one side.

Next up, fix the treble rise on those speakers - that's a 30dB bump over the lower midrange level!

Chris

 

[Aatto]

Build looks good. I'd recommend dropping the crossover down to <120Hz, though - it'll help the sub disappear better - having it running up to 250Hz would make it very easy to locate, and will pull the stereo image to one side.

Next up, fix the treble rise on those speakers - that's a 30dB bump over the lower midrange level!

Chris

I was already tweaking around in minidsp as i was reading your reply, i did brought it down to 120 and man what a difference it made, thanks for the tip
as for the treble rise i m not sure what is happening the last time i measured the speakers it was flat across the band :

nothing changed since, same setup, amps, mic and everything, i m probably doing something wrong here.
need to do some new measurement.

 

[HarryY]

Did you put something like felt etc under it to protect the floor?

 

[Zero D]

Re Post #11

@ Aatto

Nice FR What level did you test at ? It seems very ineffecient though ! Not criticising, Only noticing

 

[Aatto]

Did you put something like felt etc under it to protect the floor?

it has rubber feet underneath, other wise it would move.

@ Aatto

Nice FR What level did you test at ? It seems very ineffecient though ! Not criticising, Only noticing

Thanks the measurement in post #11 is the bookshelf alone, without the dsp or anything, it is an old school american JBL monitor, i did not calibrate the SPL at all, as soon as the mic gave me a reading i was happy ) ( also didn't want to scare away the neighbors ) i was not patient enough to do a precise measurement and i just start doing this as a hobby, not enough tools and equipment at the moment.