Sonotube Sub Tuning Question, Help Please

[Gregg Loewen]

Hi! Ive got my end caps cut for my new 30" diameter tube. The reason I have been wanting to make a new sub was because my current sub was occasionally clunking during low scenes when played at high DBLs.

Patrick post about his sonotube 1 (very similar to my current tube) have me worried.

link

If my tuning isnt low enough will I be having the same problems with my new tube??

Thanks for the info,

Gregg

[Andrew Pratt]

Gregg its is always a concern with higher tuned subs but a lot will depend on the source material. Figure that there's only a couple of titles that could cause problems and its all relative. Tuning lower will offer you some protection but at the expense of overall SPL in the most common bass region. Its up to you to decided if you want that added protection vs loosing a few dBs. Of course there's always the happy medium and pick a lower then optimal tune but not supper low

[Gregg Loewen]

Just thought of something...

Would my BFD Pro be able to filter out the signals that are causing the sub to clank? IE: can I filter out frequencies at 18? and below?

I have not taken it out of the box yet as I was waiting for my new tube to be completed then use the BFD to equalize the room with both subs booming.

Gregg

[Patrick Sun]

Gregg, the BFD won't do anything to stuff under 20Hz (for the most part). You need a more expensive unit, like the ART351 (I think ThomasW bought one of these suckers because it can filter out the sub-20Hz stuff). Note, got the device name wrong, it's the symetrix device listed in Thomas's post below. Sorry for any confusion.

The Tempest drivers seem to be a bit more robust than their little brothers, the Shivas.




PatCave; HT Pix;Gear;DIY Projects;DVDs; LDs

[ThomasW]

The BFD lowest EQ point is 20Hz. So using it as a high pass filter is going to impact everything around 20 Hz and below depending on how wide the slope is set.

I have the Symetrix 551E it's lowest EQ point is 10Hz so it's preferable for creating a real low cut-off.

But using a Tempest in a big tube there shouldn't be that much of a problem with bottoming of any sort. Remember on Tempest is almost equal to 2 Shivas




theAudioWorx
Klone-Audio