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if you added a second speaker instead of a port in the enclosure, what effect would that have on the sound? Answered

i know that if you have a ported enclosure on a subwoofer its louder and if its sealed its more precise,  but what would happen if you put a second subwoofer in the enclosure instead of a port? what would the effect be? im just curious.


First off, when an audio engineer designs a subwoofer, they take into account all the parameters of the driver they are using. In short, running through the calculations will tell whether the driver is best suited for a ported or sealed enclosure.

If a sub is in a ported enclosure, it is best suited for that box size and port used. If you seal that port up with another driver (let's just say it is the exact same as the original driver) you would make a compound subwoofer in a sealed enclosure. Sealing the box raises the resonant frequency of the box (Fb) and adding another identical driver keeps the speaker Q (Qts) the same but doubles the equivalent volume (Vas) of the drivers. This further raises Fb.

What you will get is more volume at the expense of losing some bass. There are other schemes which will help, but they are not the topic of the question.


People do this, the drivers are out of synch'.
(a bit tired to point you to anything right now - can't think of the right keywords)


Frequency response and volume would be affected.

(Simple explanation: Think about how a speaker works. When the cone is moving, it creates a bit of pressure on one side and a partial vacuum on the other. If the box is sealed, that means the pressure or vacuum is fighting against the cone's motion rather than being carried through as a sound wave to outside.)

. To amplify a little bit (I hear you groaning):
.  What you are calling a "speaker" is just one part of what makes up a speaker. The transducers that actually produce the sound are usually called "drivers". The cabinet size and shape, baffles, driver response, crossovers, ports, &c are all designed to work together as a Speaker. If you mess with any part, you affect the sound - usually for the worse.