Upgrading sub to get a live feel.

Should I have the seal or ported closer to me?

I watch a few movies here and there, maybe once a month. I don’t really care that much for movie sound quality, most of the time it isn’t master very well, at lease the ones I am watching. But when it does it’s nice.

I think you can always plugged the ported ones up and get close for testing. 

I'm not sure what the best answer to that question is.  My intuition is that it would be better to have the ported ones farther away in case there's port chuffing.  On the plus side, the PB 1000 will go lower and have more output than the SB 1000.  I suggest giving SVS a call and let them know how you plan to use them and get their advice. 

I am still concerned about him having enough output even with the addition of two PB1000s.  The PB1000s run out of steam at about 100db in the 20-30hz range.  Even if you combine them with the SB1000s, depending on how loud the JBL's are turned up, the subs are still going to run out of output capability.  All four, with being used in a distributed array are likely to max out in the 105db range at 20-30hz.  

https://referencehometheater.com/review/svs-pb-1000-subwoofer-review/

If staying within the SVS line, I would consider spending the extra for the PB-3000s.  This will get you the output that will keep up with your mains, plus 3 band parametric eqs to help with any final tweaking.  .  

Finally, I agree it is a good idea to discuss with SVS, making sure you have your room dimensions handy.  

I still don't think we know how big the room is or what the OP's budget is.  Adding two additional subs that have more output should be an improvement regardless of room size.  If the four subs don't have enough output and he can stretch his budget, the PB1000's can be exchanged for something bigger.  Let the poor guy aft least try out what he's bought first. 

Hello watcher,

     Congratulations on your decision to give the 4-sub DBA concept a try.  Prepare to be amazed! 
      Pay no attention to critics claiming there'll be a lack of output, poor integration with your JBL 4319s, the 4367s or literally any other imagined shortcoming of the DBA concept because it works like a charm in virtually any room as well as with any pair of speakers. The only criticism of a 3-4 sub DBA system I consider even faintly valid is having the room space to accommodate  3-4 subs, but this is easily solved by using smaller subs and a little redecoration imagination.  I'm sure they mean well, it's just that they have a complete lack of knowledge and experience with DBA systems.  They just don't know what they don't know.
      But you made a very wise choice and I know you're going to gain the knowledge and experience of what a good DBA is capable of soon enough.
      Choosing to add two PB-1000s to your existing two SB-1000s will extend your system's bass response down to the audible limit of 20 Hz.  It shouldn't matter whether you alternate between sealed and ported or use the two taller ported subs as end tables.  The reason is that your brain is going to just sum and average all the bass present in your room by frequency; your perception of the bass will reflect the average by frequency.  Psychoacoustics in action.
      If you'd like, I can offer specific further advice on sub positioning and the setting of the volume, crossover frequency and phase controls on each sub.  I can also answer any questions you might have, you won't find a DBA advisor charging lower fees.


Enjoy,

 Tim