sub playing the lows....???

[mustangowner 10+ year member]

The sub actually moves very little at the tuning frequency and most of the output is a product of the port itself.

what about 1hz? how does this guy do it?

http://www.realmofexcursion.com/videos/Audiopipe/txxap15bl.wmv

info off REO...John Carr's four 15" Txxap15bl in a 12 cu. ft. ported enclosure tuned to 44Hz, powered by a Clif Designs CD860HC.

 

[dman4486 5,000+ posts]

Not exactly. The sub is going to always play a range of notes. The tuning frequency applies a peak to the response at (and around) that frequency.

which is why i tune low...flat response= http://imagecache2.allposters.com/images/pic/VLH/610028-2~Caution-Screaming-Orgasm-Posters.jpg

 

[Immacomputer 10+ year member]

Your subsonic filter is what is keeping the sub from moving much at 10hz. I would lower that filter to about 20hz or so since you're tuned close to 30hz. The sub will still be controlled by the port even below the tuning frequency for about 1/2 octave. Your enclosure size will affect this though.

 

[mustangowner 10+ year member]

Your subsonic filter is what is keeping the sub from moving much at 10hz. I would lower that filter to about 20hz or so since you're tuned close to 30hz. The sub will still be controlled by the port even below the tuning frequency for about 1/2 octave. Your enclosure size will affect this though.

thanks guys, my question has been answered...

 

[Safe_Cracker 10+ year member]

Not exactly. The sub is going to always play a range of notes. The tuning frequency applies a peak to the response at (and around) that frequency.

Absolutely right! This being said the tuning frequency is the peak (most output) and the rolloff will be equal in both directions meaning a sub will play well below as well as above the enclosures tuning frequency. The subs design, enclosure/port size and available power will depict how low below tune it will play. Polo.

PS- I had two 15 SX's and they are decently still, you need a GOOD 1200rms and they will move nicely. I ran 2500 rms on a single 15 for a whole year. I then sold it and alsmot two years later he is still playing it, great subs...

 

[Immacomputer 10+ year member]

Absolutely right! This being said the tuning frequency is the peak (most output) and the rolloff will be equal in both directions meaning a sub will play well below as well as above the enclosures tuning frequency.

Absolutely wrong! The tuning point of an enclosure is NOT always the peak point in output from a sub/enclosure system. This is just the point of resonance of the air mass in the port. The sub will have a new point of resonance itself and it will usually be different than the tuning frequency of the enclosure. The tuning point and the size of the enclosure will determine this.

Also, the roll off is no where near equal above and below tuning. Below tuning, the port starts to unload. At this point, the enclosure volume looks infinite to the sub and thus can lead to over excursion without any gain in output. Above tuning, however, the air mass begins to act like an enclosure wall causing the speaker to act like it is in a sealed enclosure of the volume of the enclosure.