Originally Posted by anwaypasible
.......that's an exageration.
even a cold fusion speaker can get materials added or taken away like a phase plug to help.
the only way to circumvent the statement is to make the enclosure large (or small) enough that the whole thing needs to be redesigned before materials added or subtracted will meet the tune of the enclosure (and|or the room).
not enough people care about why speakers come with a recommended box size.
is it the phase response?
is it the frequency response?
is it the slew from the voice coil?
is it a combination of any or all of the above?
knowing those answers helps a tremendous deal when changing from the recommended box size.
for sealed boxes..
if the subwoofer doesnt have enough magnetic strength to move in a small box, there wont be enough movement to make an acceptable dB (or spl) level.
if the subwoofer has too much magnetic strength, then a box that is too big can cause the voice coil to smack the bottom of the magnet (or the linear excursion starts to lean sideways, causing the voice coil to rub the magnet until it sands itself away and breaks a connection).
there is reference math to get the best enclosure size for the speaker.
but then there is always math adjustments to help the speaker blend in with the room it is in.
it might be uncommon, but there are speaker boxes built for a specific speaker inside a specific room.
the beginning of the math starts with what you want to achieve, and it is the same as the list above.
an equalizer can help a large amount in most situations .. but combine the equalization with a calibrated speaker box and the results just get bigger and better.
too many people have one simple serious problem..
they expect the speaker to be inside the speaker box it comes in and sound perfect .. because they dont realize placing the speaker in the trunk, or in a room in the house, or thrown on the back seat .. all of those rooms will make the sound from the speaker sound different when viewing things as 'plug and play'
do some audio engineering and make each one of those rooms act as if it doesnt exist, then and only then will the speaker sound the same no matter which room you throw it in (and even then, sometimes there is always a difference in sound pressure levels).
the absolute hardest part is say.. you need like 10dB boost at 20hz , but you calibrated the gain of the amplifier with a test tone at 60hz because that is the only thing the multimeter would read a voltage reading from.
because of that..
the voltage from the amplifier can rise beyond the RMS value and burn up the voice coil.
since most amplifiers are relatively flat.. you should set 60hz to the same amount of boost and take a voltage reading to see how many watts are going to the voice coil.
it might not be perfectly accurate, but it is better than raising the boost on an equalizer only to blow your subwoofer's voice coil in the next 3-4 hours.
there isnt much that helps audio sound perfect without dialing in a calibration effort.
the few things that do exist are really short of a list:
1. toe in the speaker angle to get the biggest phase opposition from the listening position in ratio with the reflections from the walls.
2. buy a large amount of sound absorption and hope the speakers (and the box they are in) are already the same phase as the room WITH a flat frequency response
3. use the automatic equalizer calibration that comes with some systems.
the audio industry simply isnt designed for plug and play.
not even those home theater in a box with a subwoofer, because the frequency response isnt perfectly flat (close but still needs adjustment) and the subwoofer level needs calibrated with the rest of it.
the bad thing about those systems is,
playing pink noise wont get anywhere close to an actual mode of the room.
(mode is when the pink noise stops sounding like snow and starts to disappear into silence)
and that means people without a microphone trying to do it by ear are stuck listening to snow, over and over, for hours upon hours because the mode is never-ever met.
you might get your brain happy , but there isnt any knowledge of how close to reference the final result is.
all things aside..
the post might of been a reason to try the other suggestions listed (time alignment, phase adjustment).