ported Parts express Titanic 15

[Greg in Okla]

I kmow the box is a little small,but my friend Robert did a unibox simulation ,and it turned out real strongIt has an F3 of 23hz,anFB at 20.Shows 110dB@20hz and 115dB @ 25 hz.It needed a 3in X18 port,so I ran down tothe hardware strore and got a piece of plastic pipe,didnt want to spend any real amount of money getting the pieces at P.E.,till I knew I liked it

i WATCHED "War of the Worlds" on scene 3 with hthe lightning it was bounceing around 112 dB and maxed at 116 dB,Needless to say,I am very happy with how the projest turned out,my Titanic in now quite a beast! lol

[DrWho]

Are you just adding a port to the existing DIY cabinet, or you building a whole new larger enclosure?

[Greg in Okla]

I just added a port to the stock Titanic box

[soundbound]

Right on! I use a Titanic 12" in a ported box I built and it sounds amazing!

[Greg in Okla]

Even with the box being a little small.the the really puts out some sound.With all other speakers shut off,it has hit 116 dB,which is scary loud!

[TheEAR]

3 inch diameter port for a 15" Dayton Titanic 3...port noise galore at high SPL. It takes a 6 inch diameter port to to a proper job. Of course it would be way too long(and take too much volume)to even fit in this box.

[Greg in Okla]

yeah.port air speed should be to the moon.But I am not hearing much port noise for some reason .Maybe its one of the frequencys I am deaf to . LOL

[DrWho]

If you're hearing no port noise, then it means your music doesn't have frequency content at the tuning frequency.

Also, which amp are you using? A lot of the plate amps have roll offs built into them, which is actually a good thing for controlling cone excursion below the tuning frequency...I believe the Dayton plate amps are essentially a 12dB/octave rolloff right at 20Hz, which is gonna reduce the output at 20Hz like 3-5dB (which would reduce port noise too).

[Greg in Okla]

I believe you are right about the 20 hz filter,I thought it was either 18 or 20 hz,couldnt remember.So my lowest frequency is pretty much my F3 @ 23 hz.I know the box size and port tube size isnt optimal,but even so ,this thing puts out some crazy SPL levels now.Like I posted earlier ,with all other amps/speakers shut off .It did 116 dB at my seating position on the lighting scene or "War of thre Worlds" I am using the 1000w Dayton amp.So even at non optimal levels,the Titanic gained a lot by adding the port .

[TheEAR]

With a big drop from 20hz down(highpass filter),port noise on tuning at or under the rolloff point will be minimal. And for music,most content is above 30hz so... you may not even experience the tradeoff.

[Greg in Okla]

Although its not a bottom feeder ,ah F3 of 23hz should be great for most movie soundtracks,as most dont go super low,and I can use the parametric EQ to boost the lower frequencies between 23 hz and 20 hz.

[Greg in Okla]

I did some research on the Dayton amp,and the cutoff is 18 hz,So I can use the 6dB of boost the EQ has ,set the bandwidth wide,and have really strong output down to 20hz or so,and maybe still be ok on the port noise..