hi everyone, I wanted to ask you for the volume to use for a speaker. the woofer is a seas ca18rly in a reflex box(vas 32L, qts 0.47, fs 42Hz). now I have it in a 16L box, I think it's a bit small. thanks.
these 16L speakers were sealed, but they had no bass, so I then created a reflex.
You say 50L, while The link above Says from 21 to 28L.
Why this differences?
Ok thanks, but the tuning frequency shouldn’ t be +/- 10% of The woofer resonance frequency ?
ok Thanks, could you explain A thing to me?
if the tuning frequency can be lowered by Increasing the length of the tube, what is the need to change the volume of the Box?
that is, with 16L if I increase the tube to get tuning at 30hz, is it the same thing as having a box of 50L with a shorter tube tuned to 30hz?
Or in other words, if you want the bass to be both lower and louder, you have to increase both the size of the box and the length of the port. Keeping the box size the same and increasing the port length will lower the tuning but it will also lower the port SPL as well.
Yes, relative. All the variables work relative to the others.
I hesitated to write that 1st sentence (above in your quote) because it could possibly be misleading. The larger box has a lower tuning but also a shorter port? But that is correct in your example as long as the port diameters are the same. In my example, I was using 5cm. If you use a 10cm diameter, the equivalent port length would need to be about 62cm, which besides being overkill is just plain ridiculous for a 16L box. Don't forget that you should also be subtracting the volume the port (as well as other interior objects) from the volume of the box.
** Or was that a 6.4cm diameter port? Which would need about a 25cm port in 16L for the same tuning in my example. Except again, I'm not accounting for the volume the port now takes up.......
Played with this driver a bit... Works well in a 26-28 liter enclosure (gross volume) Tuned per Thiele's alignment. 2" dia. X 5" port tunes to 41 Hz. Or, 2.5" dia. X 8" port tunes to 40 Hz. No use tuning much lower as the volume of displacement of this driver will not support enough output below 40 Hz and if you do tune much lower your group delay is a real mess. Sounds nice, balanced, tight and smooth set up per above specs. All of the above assumes your drivers are close to spec. Have you measured them? Good luck!https://files.diyaudio.com/forums/images/smilies/biggrin.gif