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In Reply to: RE: Bass reflex with port on the front or on the back ... any difference ? posted by Bry on December 07, 2014 at 08:40:01
Hi thanks for the kind explanation
But so the port adds bass and the speaker goes lower ?
I mean placing far from a wall a speaker ported on the back and one same crossover and drivers but sealed ... will the ported go deeper in the bass ?
Kind regards,
bg
Follow Ups:
You're welcome.
Ported speakers typically produce more bass than sealed ones. The port creates a volume of 'trapped' air with a particular mass. Above a certain frequency, the port produces very little output and the box acts like a sealed box. At the port resonance, the port actually inverts the back-wave of the speaker and adds it to the front wave. Below that frequency, the port simply becomes a hole in the box which allows the back wave to cancel out the front wave.
For this reason, a ported enclosure will extend deeper in the bass, then drop off quickly whereas a sealed enclosure will roll off earlier and more gently. Designing a good ported enclosure requires careful speaker/enclosure/port matching to get the best behavior from the speaker.
Hi and thanks again
So now i understand why the rear port is so popular
Now that i have googled better i see almost all rear ported speakers today
In the past they were all in the front baffle
It must work for sure seeing how common it is
Thanks again
Kind regards,
bg
In my opinion, the rear port is largely a cosmetic decision. The port can also produce some undesired wind turbulence noise which is another reason to move it to the back. Turbulence is also the reason modern ports are flared or have other exotic opening shapes.
HI and thanks again
But i am quite sold more in general on bass reflex because i see speakers of unbelievable high quality adopting this arrangement
So i think it must work very good
And i also prefer a sharp cut in the bass instead of a slow slope ...
Thanks again.
Kind regards,
bg
If you require accurate bass best to avoid reflex and go for transmission line speaker.Due to very good review in Hi-Fi News I bought KEF R500 reflex speakers HFN said the bass was very good, when I tried the speakers at Home there was hardly any bass compared to my TL speakers unless the KEF's were played at a far too high volume level,KEF port at rear my TL speakers port in the front not that think port position makes much difference.
Edits: 12/07/14
Besides PMC who else currently uses transmission lines?
Acoustic Zen. I am considering them myself.
Hi and thanks for the valuable advice
You say " not that port position makes much difference "
This is what i was wondering
Maybe it is just a practical reason because there is little space on the front baffle to make a hole
Much easier on the back
Transmission line speakers are very rare today
I read indeed great things about them but i do not think i have ever heard one personally.
Thanks again
Kind regards,
bg
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