LaNauEstudi Studio - control room

I use this kind of foam because Gullfo recomended to use it if I can't find sylomer. viewtopic.php?f=1&t=16068 Here you have the specs: DATA SHEET: THICKNESS: 20 mm DENSITY 150 ± 15% Kg/m3 (ISO 845) COMPRESION RESISTANCE 40 % > 35 kPa. (ISO 3386/1) TRACTION RESISTANCE 139 kPa (ISO 1798) ELONGATION 77 % (ISO 1798) I don't know if the translation of data sheet words is the usually used words in english... I realized that SYLOMER has the same dentity , about 150kg/m3. Can I reduce the foam into the box to increase the weight per cm2? Then I would fill the gaps with rockwool.

I think I mistook the image for a different product that is made from recycled tires, hence agglomerated rubber.

New pictures: Removing the ADAMs poweramp: Wires must be cut to add a longer ones, and then soldered again. Monitors are made of 16 mm MDF... The power amp is attached on the below frame and the monitor in its box. Slat resonator between the monitors. Covering with slats till the top for aesthetics and bottom cloth stappled. Second layer over the monitors:

i realize i'm late on this but the amps generally should not go below the monitors because the heat rising off them will interfere with the HF response (remember air velocity is dependent on temperature and while all frequencies respond to the same air velocity, the shifting heat patterns rising (as presumably you have air movement) will tend to interfere more audibly on the HF range). if you can, move them to the center.

Doesn't John have a model of a baffle he designed that takes into account the power amp being rear mounted and introduces an air exchange path for that heating issue?

I removed the power amp to better access and air flow :( . How much it affects it? As I know the speed of sound is faster at high temperature. If temperature increases 1ºC, speed of sound increases 0,6 meters/second. But I never heard before about how much it affect on HF or LF. How much could a power amp heat up? :?: Here you have some new pictures: "Pintxo" the builder. I've been checking what should be the visual effect if I attach the panel like that:

Tomorrow we'll remove the front plate and the bottom cloth to move the power amp to the center (next to slat panel). I hope the wire let us move it to there. With the front plate out, we'll unscrew the inner box to remove the agglomerated foam to made something like that: But, what can I do with the rear cavity of the monitor before screwing the back plate? Shall I isolate it with rockwool? Should I let it opened?

awesome. You can box in the speaker completely, the end result is just a much heavier speaker-box as the original. You can use a spring to "decouple" the speaker from you new mass box. Or decouple that new heavy speakerbox from your stand. Whatever you prefer. In your drawing you have 2 slides of foam underneath the box, is that enough to compress the foam for about 10%? (if it does, you've done the right thing :) ) Oh, and screw in an new backplate to close it up again (add mass). keep the noise at the front. Tho if you it needs to "breathe" a bit, but you have reflex ports on the front for that. keep in check if that path isn't broken.

Can I keep the inner box as it is and lay it on a new piece of rubber without made another box?. Now the mass is doubled and I think the foam will be compressed about 10%. If I put another plate of foam below the inner box the height from the bottom of the monitor to floor will be next to 120 cm . It's higher than recommended? If it's ok, would I paste the box to the bottom foam with glue or any kind of caulk?

I think surrounding the existing speaker with the foam completely and build a TIGHT box that will put some pressure on the foam will be a good idea. If you make it tight enough, it'll compress the foam all around, aim for that 10%. That'll totally decouple (all around) the thing. Don't need to decouple it twice, tho.

Now the box is as tight as it isn't decoupled. The floor vibrates with LF. I thought of that idea (lay the box on a layer of foam) because I do not like having to dismantle the inner box. So my question is: will my idea work? or is needed to build another box? Could I put the box on a new layer of agglomerated foam or should I need to build another box to made it effective?

The floor vibrates with LF.

If the floor is vibrating through the speaker support, then it isn't decoupled. So either the foam is over-compressed and flanking, or it is under-compressed and flanking. Or maybe it just isn't the right type of foam for this application. - Stuart -

Glenn (Gullfo) recommended it. But when we built the box, we needed to compress the foam to close it. I think that was the problem. This foam is about 150 kg/m3 but I think using it across the whole surface was not a good idea, because it wasn't decoupling, it wasn't acting as a spring. Maybe if we make four 1" (2,5 cm) squares using it as speaker legs it will work. But, again, can I let the box as is made and put it over another layer of foam? or, is needed to made another box? What's the better option?: 1.- Put the box as it is over a new layer of foam realizing that is compressed about a 10%. 2.- Dismantle de box and take out the surrounded foam and let only 4 squares of foam (about 1" per side) below the speaker (and check if its 10% compresed).Let air gaps 20 mm) between the monitor and the box at sides and above it. 3.-Dismantle de box and take out the surrounded foam and let only 4 squares of foam (about 1" per side) below the speaker (and check if its 10% compresed). Fill the air gaps(20 mm) between the monitor and the box at sides and above it with soft rockwool. 4.- Other options

Removing the poweramp and placing it out of the speaker axis to avoid the heat flow over the speaker. The front plate has been removed to take out the agglomerated foam of the speaker box. The botom plate of the box is very hard to remove because the glue. There's been a change of plans. I've been thinking of using the MoPads under the speakers into the box and fill the surround with acoustic foam like this: Acoustic foam: Would it works?

I've been testing some mat as decoupler. I've used a stethoscope to ear the sound transmission across the structure. With the "MoPads" there is no transmition throught the structure or through the front panel. But I realize that there is something curious: When I put the stethoscope on the small piece of rockwool below the speakers (where the poweramp was before) there is a lot of LF but not on the frame, only on the rockwool. I've taken the rockwool piece out of the frame without touching the frame and the LF had gone. But then I've put the piece into the frame on straight angle and there is no LF booming. What should it be? I have also been testing the agglomerated foam square cutted. I've started with pieces of 4 inches (10 cm) per side. But there was no compression (only about 2%). Then I've cutted it half size (2,5" - 6 cm) and there is about a 5% compression. Then I have cutted it about 1,25 " (3,5 cm) and the compression was about the 20%. It so much compression? It's ok? The mopads seems not to be compressed but it works (decoupling is ok) But I have the main question: Can I let the box with 2 cm air gap all around the speaker? Can I only let the decoupling material (mopads or aglomerated foam square feet)?

New pictures New back wall shelve: I'm thinking of doing some treatment in some cubes of the shelve.A mixture of absorption and diffusion, bookcase, etc.

Finished: Backwall shelve full of junk: I've been listening some of my last mixes and now they sound strange. It seems that they have so much reverb and guitars/bass sound different. But commercial CDs sound awesome. Now I can hear the LF better, every small EQ change between 20 and 100 Hz is noticed. There is a small space between the speaker and the bezel, should I put an elastic caulk there to tight them?

I've been listening some of my last mixes and now they sound strange. It seems that they have so much reverb and guitars/bass sound different. But commercial CDs sound awesome.

let me guess: your previous mixes were done in a room with insufficient treatment, and not-so-good acoustics? :) Welcome to the world of "mix translation"! I bet if you re-do those mixes in your new room, they will sounds just as awesome as the commercial ones... By they way, the room looks GREAT! Did you do any measuring with REW? It would be cool to see how things are working out in there! - Stuart -

Here the Average FrecResp of both speakers in the engineer placement : L and R separately: RT30 (I don't know if it's right):

Wow! :shock: :!: That's pretty good, all around! Congratulations on a job well done. Very nice, both visually and acoustically! - Stuart -