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-   -   What advantages running ported midbass if you are running a sub? (http://www.diyaudio.com/forums/multi-way/123407-what-advantages-running-ported-midbass-if-you-running-sub.html)

mitchyz250f 20th May 2008 12:46 PM

What advantages running ported midbass if you are running a sub?
 
What advantages running ported midbass if you are running a sub too? Is there an increase in sensitivty?

I have read where people tune to lets say 80 and set the crossover at 80. Does this mke sense. ?

gni 20th May 2008 01:10 PM

It can keep the response of the mid driver smoother. . . usually
the port will split the resonant peak into two smaller
peaks keeping the response smoother and gives the driver
a better roll-off at the bottom end. . .

The best type of sub + main speaker systems have the mains that
can produce the low frequencies well. . .they usually have a smoother
roll-off and sound more natural. . .the mains are still going to be
getting some of the frequencies due to the cross-over slope being
12 dB/Oct or 18 dB/oct or 24 dB/oct or higher but it is still not
an infinite brick wall that separates the two. . .both the sub and
the mains need to be able to produce the frequencies two or
three octaves beyond the crossover point. . .

gtforme00 20th May 2008 02:20 PM

A ported alignment will create a 18db/oct (3rd order) acoustic filter below the tuning frequency, a sealed enclosure will create a 12db/oct (2nd order) acoustic filter below the tuning frequency. Either of these can be used along with electric filters set at or near the tuning frequency to create a steeper effective acoustic filter.

In my personal experience, I find it easier to blend a sealed enclosure with a subwoofer.

There are two other advantages of a sealed enclosure that may or may not be important to you.

1. They are usually physically smaller.
2. If you choose not to run a high pass filter to the mains (not recommended), they provide better protection against large excursions at low frequencies. A ported box does not substantially load the woofer below the tuning frequency and will provide little protection against over excursion of the woofers.

Regards,
David

Conrad Hoffman 20th May 2008 02:34 PM

I run an open baffle mid bass, but I think sealed is the easiest solution. A ported system will have phase shifts that make the crossover design far more difficult.


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