well, today i put the lid on and bolted the sub. first impression (with the amp at the exact gains as before) is that it is as loud and goes lower than with the previous sub. oh, i forgot to say that it's firing towards me, not towards the corner, as before. it goes as low (if not lower) than my db12 + cheapie. i've noticed one bad thing... if i push it realy hard (+200w) i get port noise. it's just a bit, and it's not audible with normal listening. i only heard it with the fullranges off. really makes me think, because everything is sealed right and the halfmoon is rounded (3/8 radius inside, 1/4 radius outside).
EDIT : i've put a 15 hz sine and i'm rather sure chuffing was coming from inside the box, not from the halfmoon...
i thought that the driver could make those noises, since it has a vented pole-piece and it has a really fine mesh to protect from some dirt/debries ?
the edges of the insert over which air flows are rounded (abour 5mm radius)...except the speaker hole.

[quote author=60ndown  link=1136558907/0#2 date=1136753960]15hz?!  :D  well if you have music and movies that have 15hz on them i want a copy.if not dont sweat the 'chuffing', everything, cars, speakers, amps, girls, your body, starts to behave strangely if you push them too hard [/quote]
Many movies are loaded with infra info. "Lord Of The Rings" is the first I think of because it has so much. This whole infra bass stuff intrigues me, but if your sub reaches the 20s you will get most of the LFE out there. You don't need to have 6 15s in your living room and a low tuned cab (like me) to appreciate the LFE channel.

I've actually been using a biamped setup, since rehashing stuff a little in the summer, for just the LFE. 2 - 15" in one BR cab tuned to 32Hz with 400W on them crossed over at 28Hz and my "big whistle" 4 - 15" tuned to 16Hz with 1000W on it. When I built my first 2 WOs I put them in the living room for a while, but they couldn't really go low enough for my tastes. They were much better suited to the garden. Even with all that power my response peters out in the mid teens, At one time I had some test gear and measured some 8Hz content in "Stargate", but I couldn't reproduce it.

Believe it or not the movie that has the most impressive use of infra bass, that I've seen, is "Atlantis: The Lost Empire" an animated Disney movie. The latest "Star Wars" has a little stuff in the teen Hz range, also. After running a few test you get used to what shakes at what frequency. It's all good.

As far as music, forget it unless you go for Tech stuff or synthesizer there nothing in the teens that I've ever heard.

Quote:

good guess. i did the 15hz tone because of two reasons:
1) i can hear where chuffing is coming from
2) i don't disturb anyone at those volumes
so, back to my problem....where could that noise be coming from ?
i'll remove the bottom lid today, and play some music/sines to see if i can get the same noise (practically to see if the halfmoon could be the culprit )
EDIT : i removed the bottom lid and put a 20hz sine. immediately the chuffing was back. turns out it was coming from a screw hole. i asked my dad to predrill and he drilled through both the panels. i told him there could be leaks, he said it's impossible. guess i should have done that myself...
now i've got to think of a way to repair it. the bad part is i can't listen to it while the stuff i'll use to cover the hole dries

actually i feel very proud... because i cut a drywall screw, put some silicone on the 4 threads that were left after cuting and screwed it in the hole. problem solved.
however the "excitement" of a new build/upgrade can cause problems...
i guess it's useful to have a couple of watts to push it hard just to see some weakpoints in the build and fix them.
next on the list is a bit of panel flex. the bottom lid.  >:( that will have to wait till the summer vacation

no. the db10 has a simple panel. the db12 has a double panel.
no time to build

Infinitys don't fit with magnet in the port end of baffle.  I had to triple the baffle up hehe.

It definately sounds better with the cone firing into the sealed chamber with the insert all the way up to the bottom of the half moon for me.

Yes, it will fit however you want it as long as it's installed from the sealed end.  I haven't checked for sure, but doubt it would mount from the ported end with the magnet in the ported end.

Yeah I guess I do take the DB apart alot....  hehe

Mine is built, haven't had time to test much though other than just hitting a couple of test tones to try it out since I only have 1 RCA to my amp---which reminds me I need to run the other.  

My gut feeling is I won't keep it, and will build a .75 cu ft sealed box.