Can't help Phil's issue, but this has made me want to dig out all those spare socks from the drawer and stuff them in my ports for a bit of fun... I think this forum may finally have got to me!
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Can't help Phil's issue, but this has made me want to dig out all those spare socks from the drawer and stuff them in my ports for a bit of fun... I think this forum may finally have got to me!
Glad you posted Alex, i was going to earlier but forgot about it :doh:
Sounds to me like there is a lot of port turbulence, now this can be caused by a combination of things but the most usual is simply that the port has been made too small. Either that or there has been no thought to rounding over the edges to decrease turbulence..
One of the biggest problems is that most manufacturers simply don't pay enough attention to decent port design. If you look at the outside of an enclosure you'll find that 99.9% of the time the port is flush with the front or rear baffle, however if you take a look inside most of the time all you'll see is the port tube ending in free space :mental: It might not at first appear to be a problem...
What happens with this mismatch is that air finds it far easier to flow into the enclosure than out of it & what tends to happen is the enclosure gets pressurised somewhat under sustained bass notes. The result is the bass driver is gradually pushed out from it's naturally centred position & all sorts of distortions rear there ugly head in both the bass & any other frequency the driver is dealing with.
The simple answer is to give the interior end of the port a small baffle so air can escape just as easily as enter.
Another good thing to do is rout the edges of the port inside & out so that there are no sudden edges to create turbulence.
So to sum it up, use as big a port as possible, place a small baffle on the inside end of the port & rout the edges of the port with something like a 12 - 18mm round over router bit :)
Well, this was interesting. Although all it did was prove the ports on my speakers are there for a very good reason! I discovered that the front ports are linked to the bass enclosure, the rears to the mid (and treble?) - and that blocking either or both does what you would expect, really. I can't detect any "chuffing" but then who knows, as I have happily lived with these speakers for nearly 7 years. The ports seem to be well designed following the principals Mark mentions - a 2" tube, and the "exit" is a rolled funnel-type arrangement.Quote:
Originally Posted by Alex_UK
Anyway, that's my curiosity sated, I shall keep my socks on and stop sticking things in my ports from now on! :)
Rasping from rear port = your playing music too loud for the speakers!
The woofers are shifting too much air for the design of the ports to cope with and you just end up with thoroughly confused air. You could argue it's bad design or you could could argue the manufacturer never intended for you to try and get 125db out of them??
I would say your only options are either turn the volume down or buy bigger speakers!!
Butuz
+1 on the too loud. i've never ever had a port problem becuase i use speakers at realistic levels.