I believe you should avoid mounting a speaker on a large metal panel of the enclosure. It might vibrate in resonance to certain speaker frequencies.
According to an instruction manual I read, the best stereo effect has the speakers positioned in an equilateral triangle with the listener.
Hi,
I´d divide both speaker´s voulmes. So they can´t influence each other.
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Placement: not critical in a closed case.
But if you use bass reflex system you need an exact distance between reflex opening and speaker. There should be software available to calculate this with the use of Thiele-Small-parameters.
Klaus
Thanks very helpful.
As I said speakers supposed to mount on the case with 4 spacers with 30 mm height.
How about I fasten speakers with some "FIBRE flat washers" to these spacers?
These washers absorb mechanical vibrates .
Yes, I don't understand the "spacers" thing at all. Perhaps we can see a drawing for clarification?This means the speaker should be mounted snug against a flat surface.
A speaker frame needs to be mounted firmly. If the speaker frame can move (vibrate), then it defeats cone movements. Volume is reduced. Efficiency is lost.
Are your fibre standoffs made of cloth-like or felt-like material? These do not provide a firm mounting. I think a better substance is hard rubber or bakelite or wood.
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It is also important to mount the speaker so that sound waves from the front side cannot meet sound waves from the rear side. Otherwise volume is lost, because sound waves from the two sides are 180 deg out of phase, therefore they cancel.
This means the speaker should be mounted snug against a flat surface.
Yes, I don't understand the "spacers" thing at all. Perhaps we can see a drawing for clarification?
Recall that a bass reflex involves not only an opening, but also a pipe or cavity communicating the main case with the opening.
The case is decribed as having two parts (top and bottom). I'm wondering if the case is designed for a bass reflex and the smaller part is that cavity (even if 40 mm seems too slim to me).
An image or a drawing could help to understand and give a better advice. Can you upload it?
Z
Ideally the speakers should seal directly against the panel.
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Choosing good speakers will be the key to getting good results.
These are only 3w speakers and probably quite small.
While resonance of the large area metal panels "might" be a concern at high audio power levels, in something not much larger than a computer case, I cannot see that happening.
The danger is that the speaker may shake the metal panel producing a tinny sound, but if the panel is reasonably stiff and heavy, that is unlikely to occur.
For best efficiency mount the speakers rigidly over a hole cut into a flat panel.
Ideally the speakers should seal directly against the panel.
No real problem having stereo speakers in a common air volume. When you select the speakers, try to find some with the lowest natural cone resonant frequency.
Some are pretty good in that respect, and some are awful.
Choosing good speakers will be the key to getting good results.
There is a rubber ring around the cone and that must make a airtight seal with the mounting plane. The mounting plane should not be recessed too much inward (loss of high frequency).
Consider the speakers as antennas. They are like microphones in reverse and have their own 'lobes'....
As the cone moves, the air inside the enclosure also vibrates 180 deg out of phase. That must be quenched (or damped)- use some sponge or felt mat as inside lining for the cabinet.
As speaker is as good as it cabinet it is mounted in but even a good cabinet can never compensate for a pair of bad speakers. But even excellent speakers cannot compensate for a poor recording with poor stereo separation.
Low power speakers are generally poor in reproducing low frequencies and you can get impressive results with a simple independent bass speaker (in addition).
So you say if i don't seal speaker against flat panel it may be compromise efficiency ? But i decided to mount speakers on bottom part of case so there is a little spacing (about 8mm) from speaker to flat panel. What will be happened in this configuration ?
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