Do you think I need extra reinforcement to these braces? I hate to do any drastic changes but would rather try to get it right than having to redo them. I've never done anything this big though.
The internal dimension of the base module is 660mm x 210mm x 380mm.
http://www.geocities.com/hai_vu1/braces.jpg
The internal dimension of the base module is 660mm x 210mm x 380mm.
http://www.geocities.com/hai_vu1/braces.jpg
I'm sure you'll have plenty of volunteers but I'm not going to sit there while a 400K picture loads.
you should be ok on bracing, but I would suggest some acoustic stuffing at least on the enclosure walls to dampen reflections back to the cone
Plenty of bracing there.
The only thing I'd redo and I'm picky, would be the center brace on the bass cabinet. All of the two braces that connect front to back are only joined by a small amount of MDF because of the circle cuts in the adjoining brace.
It will be fine without but I'd redo the top to bottom brace with squares inside of circles to allow full contact on the other braces - OTT maybe but if a job is worth doing its worth doing right.
The only thing I'd redo and I'm picky, would be the center brace on the bass cabinet. All of the two braces that connect front to back are only joined by a small amount of MDF because of the circle cuts in the adjoining brace.
It will be fine without but I'd redo the top to bottom brace with squares inside of circles to allow full contact on the other braces - OTT maybe but if a job is worth doing its worth doing right.
ShinOBIWAN said:
I understand what you mean but I already ran out of wood and to do that I need to purchase another 4 x 8' panel. What I'll do is glue a small piece of wood at the opening in between those braces (that you mention) so that they are pushed against each other which would give them extra strength. Not perfect but a little bit better.
This doesn't answer your question instead it's one of its own. It looks to me like the front baffle up top has three layers of mdf and the bass cabinet only two. My thinking would be, to have done it the other way around, but I'm new to this so maybe someone can enlighten me.
Off centre, prefereably at an angle... in the middle of a panel, the brace actually does little to suppress the 1st resonance of that panel -- it can actually enhance it (ie make it worse).
You should also make sure that the cross-braces are not symetrically placed as well, and that they don't brace to create a square sub panel.
dave
with the brace in the middle shouldnt it control the 1st resonance, but not the 2nd, 4th, 6th and other even multiples?
Any waveform that has a null in the middle of the panel will have a minimum amount of suppression. Because the wall is clamped at this null point, energy at similar frequencies can feed these resonances as well, giving a situation where the panel can actually be worse after bracing.
dave
Attachments
Within reason more braces are better. Think irrational numbers/ratios when you are planning placement and if they can be at an angle even better (ie divides panels into trregular trapezoids instead of rectangles.
dave
Dave,
How does the 'matrix' style bracing work out in a midrange enclosure? - ie braced squarely, every 4" or so front to back, side to side and top to bottom. Would this push any resonances up above the mids bandwidth ? 4.5" is 3000Hz.
I've been reading a bit on bracing recently, and some stuff seems to counteract the other so to speak. ie adding bitumen to panels lowers resonance / bracing raises. I also read somewhere to brace to raise the resonance and to add bitumen to kill whats left. Also can we not add stuffing to kill the 3000Hz before it hits the walls so to speak ?
Hope this isn't threadjacking btw - Can move it to a new thread if you like.🙂
Cheers,
Rob
How does the 'matrix' style bracing work out in a midrange enclosure? - ie braced squarely, every 4" or so front to back, side to side and top to bottom. Would this push any resonances up above the mids bandwidth ? 4.5" is 3000Hz.
I've been reading a bit on bracing recently, and some stuff seems to counteract the other so to speak. ie adding bitumen to panels lowers resonance / bracing raises. I also read somewhere to brace to raise the resonance and to add bitumen to kill whats left. Also can we not add stuffing to kill the 3000Hz before it hits the walls so to speak ?
Hope this isn't threadjacking btw - Can move it to a new thread if you like.🙂
Cheers,
Rob
At that spacing little is going to move, but equal spacing is probably a compromise.
At 3k not a lot of energy is going to hit the walls. Bitimen is not something i like to use. Stores energy & lowers panel resonance.
dave
Ok thanks Dave. I'm actually reading up on this for a midbass cab , 80Hz-300Hz xo'd 24dB/oct each side. I'd imagine thats more than enough for that app.
Cheers,
Rob
Cheers,
Rob
- Status
- Not open for further replies.