 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
76.100.161.27
Ponder and expound on this if you would please, using an infinite baffle or baffle-like design as a coffee table to increase bass. Picture an infinite baffle speaker laying on its side. Would it work and what should it look like on the inside? There are plenty of speaker cut-away images out there, I've seen a couple, but don't remember where. It seems to me, that by covering the inside of the baffle at reflection points, directing and re-directing the sound waves and covering the internal back walls with sound absorbing materials that this would act as a bass trap, tricking the sound waves into thinking that they have a larger environment in which to propogate and yield increased and deeper, better defined bass response? I know that's a bit simplified but, so be it. I thought, since I could use a coffee table and increased, better defined bass response, that I'd kill two bird's with one stone and so I'm seeking ideas and feedback.
Thanks to all.
Follow Ups:
Check the enclosed...
Sadly, IME, most audio devices, including racks, are not really related to furniture. They're usually vibration control mechanisms, to which most furniture does not lend itself.
We've all dreamed of great looking (WAF high) audio equipment that serves double duty as furniture. I have yet to find that!
If you're making a speaker to try to double as a coffee table, it's going to vibrate as a coffee table, anything on it will annoy you sonically when that vibrates, and the overall sonic picture isn't promising.
Still, you nevah know till youse tries it!
Is this speaker connected to an amp and being driven?
I get the feeling you're talking about using an unconnected speaker as a trap. When pressure is high in the room, the driver moves inwards into the box, reducing volume in the sealed box and increasing volume in the room slightly, and as pressure in the room decreases the opposite occurs. Effectively the unconnected speaker acts to reduce pressure variation in the room and that's also what bass traps do: reduce pressure variation at bass frequencies.
Certainly many people have commented over the years about how having unused speakers in a room can affect the bass behaviour of the speakers being used, weakening it.
I suspect that theoretically you could build a bass trap this way but how you would go about determining the size of the enclosure and the size of the driver(s) used plus the stiffness of the suspension in order to ensure optimal broad band response is beyond me. I also have no idea of whether such a trap is going to be any cheaper than a DIY bass trap made using one of the standard bass trap designs. It would, however, still end up being big and visible, and would also need to be placed in a high pressure area like normal bass traps in order to achieve maximum performance. That probably means placing it somewhere else than you would place a coffee table.
If you've got a couple of spare infinite baffle speakers or if you can borrow some, play with them. Simply connect the + and - terminals on each speaker and then play with placing the speakers in your room at various locations including where you want to place your coffee table. See if you think they make a positive difference. If they don't, and I suspect you simply won't get enough effect wherever it is you want your coffee table if that is well away from the walls, then you have good reason for giving up on the idea unless you or someone else can come up with a detailed design for enclosure size and drivers to be used.
David Aiken
Picture this, a retangular box, say 18 inches tall, 36 inches wide, 24 inches deep. No drivers, but maybe different sized ports out the back (facing the seats). Wave inlet (open slot, from side to side) across front, on the bottom. Internal wave directed, then re-directed baffel walls and sound absorbing materials inside. Maybe a slot from side to side across the top, as well. Think something like a PA (concert)speaker but, without the drivers, a horn speaker enclosure, except the sound waves go in are re-directed and absorbed so that a 20 Hz wave (for example; but proably inaccurate) thinks it can propogate, because it thinks it can go that far, due to the baffling. A purely passive device. Hope this helps.
There are devices that work that way for absorption. One is the Helmholtz resonater which is really tuned to a single frequency, that being its weakness. It's a highly effective absorber with a very narrow bandwidth. You can extend the bandwidth but at the cost of having it absorb less.
I think what you need to do is to buy or borrow a copy of F. Alston Everest's "Master Handbook of Acoustics". It contains some good explanations of the theory behind various approaches to absorption, including some that work along the lines you're describing, and descriptions/instructions on how to build such devices. I think you'll probably find some useful information on what you're thinking of in there.
David Aiken
Except for some variation by the use of damping material, the volume of an infinite baffle is just that. Shape doesn't fool it into thinking it's bigger and therefore doesn't lower the resonance point or change the damping. However a stuffed port(variovent) will make it seem larger in the sense that the damping will be tighter but again the resonance point will stay the same so the bass will be better controlled but leaner sounding.
Post a Followup:
| FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
||||||||||||||
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
