Oh look that's just what I said it would be like
This could be that the higher tuning maintains a flatter response down to lower frequencies, i.e. the longer port makes a droopy response. 40Hz actually sounds pretty deep and below that it becomes more of a feeling than a sound, so if you are getting that low it could appear that the higher tuning has better bass.
I'm not aware of the losses you speak of. Near as I can tell the bad things are that the port length increases and because of that you can get port resonance behavior....
Trade you bad stuff I have never heard of for the very bad stuff like port compression, air turbulence and chuffing.
And the idea people can hear all these reflections from a large port... well with a crossover set the only thing you are hearing are distortion products... Minimize that and your golden. Large ports minimize distortion at higher spl and @ lower SPL, distortion should not be significant.
Acheron : Screen Channel Loudspeaker System
If you take a look at this you can see that meyer sound agrees... Subwoofers benefit from large ports. Guessing that's about around about 4x10" dia. port area for just 2 15" woofers. By that standard my suggested single 8" port is tiny. Winisd alpha will model airspeeds, check it out.
4" and 6" ports are creating distortion.
If you take a look at this you can see that meyer sound agrees... Subwoofers benefit from large ports. Guessing that's about around about 4x10" dia. port area for just 2 15" woofers. By that standard my suggested single 8" port is tiny. Winisd alpha will model airspeeds, check it out.
4" and 6" ports are creating distortion.
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A single 4" created a lot of noise but with two 4" or a single 6" I didn't detect any port noise at the levels I've been driving it even when I listen with the port facing me. I believe that's do to it's low xmax. This speaker doesn't seem to be particularly efficient at very low frequencies where higher volumes of air are moving. I never believed it to live up to audiophile expectations anyways. After all, it came off a table at a swap meet.
I enjoyed building the enclosures and experimenting to see how good I could get it. I've decided on a 24x24x16 enclosure with two 4" ports. My guitarist friend plugged in his bass with a 500w head and it liked it but it would need tweeters to be desired by a bassist. Looks like it will serve it's life as a PA sub. I'm sure I can find a DJ who would like it.
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