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PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers (desks) etc.

porting a compression driver enclosure
porting a compression driver enclosure
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Old 17th October 2019, 08:29 AM   #21
Damo s is offline Damo s  United Kingdom
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The port will provide some ventilation for when the driver gets hots, plus I found that when simulating a sealed enclosure even at 50 liters the response drops by more than 3db at the xover point compared with the ported 25 liter box.
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Old 17th October 2019, 07:18 PM   #22
conanski is offline conanski  Canada
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What are you simulating response with? The common reflex/sealed box simulating programs do not work with any accuracy above about 200hz.
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Old 18th October 2019, 08:16 AM   #23
Damo s is offline Damo s  United Kingdom
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winISD. It's the region below 200hz that I care most about. A bit of EQ above that to flatten the response out isnt a major concern, but If I had to say boost 3db at 110hz to restore the punch then that's potentially going to consume a lot of power.
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Old 19th October 2019, 04:19 PM   #24
conanski is offline conanski  Canada
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OK you confused me with this talk of a dip at the crossover frequency as I thought this thread was about the compression driver not the midbass.

3 things:
Yes a sealed box rolls off sooner than a ported box but the bass/subbass crossover often ends up acoustically overlapped with the bass boost now common in modern music and with the way most people end up configuring a system with subs louder
The type of crossover used will also affect response through the crossover region, an even order LR will sum flat while a Butterworth produces a hump, designers sometimes use that to produce the desired response.

Modeling programs are based on mathematical formula and represent an ideal. The problem is drivers do not behave ideally and when they are combined with crossover and EQ filters the actual results you get will vary sometimes significantly from the simulation. If your speaker measures with roughly the same response shape as your simulation that is considered a success.
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Old 20th October 2019, 05:22 PM   #25
Damo s is offline Damo s  United Kingdom
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yeah sorry it moved on to porting the mid / bass driver too.

I guess Ill find out once its made. hope it will be OK but expecting some EQ
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Old 20th October 2019, 10:25 PM   #26
conanski is offline conanski  Canada
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Don't worry about needing some EQ it's not really optional with PA speakers.
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