wow thanks for the information! long story short, this sub was lost after someone die... and i find it at friend house and i got it for 500$ sealed in box.
so now if i one rune it on daily with this 6 ft3 box i need a 5k amp thats it? i want play music with it no competition or burst.
can you give me a model of amp i can use?
and if i need 5 inch at the end its 19 1/2 - 5 3/4 = 13 3/4 for the missing lenght. im correct?
thanks!
You definitely stole this for 500$.
Really that sub will function with a small amp but just if you don't plan to go into big power you could do better elsewhere. These subs are built (mechanically) to handle tremendous bursts of power and the coil could handle 1200W sine wave indefinitely/continuous. Anything that makes a woofer really handle more power robs efficiency. While it's a tremendously efficient woofer in it's intended power application, a wimpier sub designed to function on 1200W may well do better on a 1200W amp.
Big box will most certainly compensate for some of that lost efficiency though possibly at the expense of some musicality. Neodymium motor subs can be notoriously peaky and those which are designed to win SPL world finals (like DD-Z) are designed to be peaky. Not saying they can't sound good, just it's really not built for daily/music on modest power.
Sounds about right for the length, I'd draw it out on paper to double check and/or dry fit the port as you're assembling the box to confirm you have precisely 5" all the way down the port and around the corner. Personally I would just leave that off entirely and add a small 45 degree angle or roundover the corner behind the port. Higher tuning should really gain you a lot of output in critical 40-55hz range.
FYI DD did not publish specs on their older lines and many were custom built to order (particularly on the Z). People who use this sort of sub generally don't use TS parameters to design their boxes but basically build the box around their vehicle's acoustics and tweak from there.
I don't think you understand the can of worms you're opening trying to use that sub to it's full effect, and it sounds like something like the FU 750 or Sundown SA line on a legit 1200W amp would get you were you're trying to go with money left over if you sell/trade the Z. If you don't plan on doing some electrical upgrades and running a solid 2000-2500W amp you're really doing that sub a disservice and selling yourself short.
Do you have room for a bigger box? What's your budget? Are you willing to add batteries and a high output alternator? What's the loudest vehicle you've ever auditioned?