LOUDSPEAKER DESIGN, © GGA,all rights reserved.
FIRST LET's look at open baffle/baffled speakers and WHY they sound GOOD
Box speakers are fake bassy,and their engineering is fake,they sound boxy because of the box acoustics,boxes are acoustics beasts they reproduce bass according to their box acoustics.
Driver must come first because is the source of sound,open baffle/or baffled speaker is the closest thing to driver sound.
Open baffle has been malengineered because of lack of knowledge.
You can engineer any driver with baffled speaker system.depending on your knowledge of course
The acoustic property of baffle is almost neutral ,the only thing baffle does is increase efficiency of the driver.
To get the bass you want you have to start with the driver first,and second with a baffle to increase efficiency of bass.
Another unique feature of baffled speaker can provide 3D image on sound.
Folding the baffle reduces foot print of speaker.
Diffused bass as some call it, is the product of low efficiency of baffled speaker.
Cone size does increase efficiency but near field.
Power and room increase efficiency room field.
A few points on baffle speaker relating to how it works
Making the baffle larger : more lower frequency bass
Making the baffle smaller : less lower frequency bass
NOW LET's look at box speakers and WHY they sound BOXY
The sealed box,least boxy than the vented box
To get an idea of the speaker response (in design) we should look at the Qtc graph
The graph displays various QTCs
The ideal seems to be the 0.7 because is flat and with extended bass response
Higher QTCs peak at resonant frequency and have less bass response . Lower QTCs are over damped at resonance with good bass response but less flat response than 0.7
All this depends on the volume of the Box
A few points on sealed box relating to how it works
Making the box larger : lowering the QTC
Making the box smaller : increasing the QTC
The vented box has a vent and the internal acoustics of the box radiate through the vent so it's more boxy than the sealed box.
Now i have formulated my own maths for the sealed box which is my own proprietary technology
However for Thiele/Small maths on sealed box click the link bellow
==>> Thiele/Small Maths
NOW LET's look at box vented speakers and why sound bad
Vented speakers have a vent,this vent couples box acoustics to room acoustics, with sealed speakers box acoustics are sealed,and we only treat room acoustics, vent speakers box acoustics are complex and when put in a room is very dificult to treat room acoustics because both interact and need high precision alignment, this alignment is not possible,because is highly unreliable.
A few points on vented box relating to how it works
Making the box larger : lowering the resonant frequency
Making the box smaller : increasing the resonant frequency
Making the vent length longer : lowering the resonant frequency
Making the vent length shorter : increasing the resonant frequency
Making the vent diameter larger : lowering the resonant frequency
Making the vent diameter smaller : increasing the resonant frequency
Now let's look at an (in design) graph of vented box speaker
and how it compares to the sealed box speaker
as you can see the sealed box line is not qtc 0.7
is a lower Qtc overdamped at resonance
any way your decision is yours to make
My Conclusion as to what is best
It's the sealed box speaker (just the right bass) , not too much bassy (vented box) , not too less bassy (open baffle).
Copyright,GEORGE GEORGOPOULOS AUDIO, All rights reserved