room setup suggesion needed

@erik_squires I'm not playing Erik. The only people who believe in bass traps are the people who sell them. My only motive is to keep people from wasting their money. Measuring and listening to bass is very tricky as it depends on exactly where you are in the room even with distributed subwoofer system. Several inches can produce a noticeable change in bass quality and a microphone is no different than your ear. The so called theory behind bass traps is the material they are made of absorbs bass energy, at locations where standing waves are likely, turning it into heat. It is a perversion of the reason we stuff speaker enclosures full of fiberglass or polyfill. Except in side s speaker enclosure the changes in pressure are at least a magnitude greater, if not two, than what you have in a room.  

@erik_squires Not my EQ Erik. Retail is now $15,000. Eq will not smooth out the nodes. It will flatten the frequency response at any given location in the room at the expense of a lot of power. Can you tell me what an 8 foot tall bass trap is going to do with a 32 foot wavelength? 

Low frequency sound waves are extremely powerful. 20 Hz at a very reasonable 80 dB will cause your entire house including the garage to buzz and rattle. Try trapping that. 

@ssg308 What you have is too much mid bass and not much really low bass. Very few speakers do much below 40 Hz particularly ported designs. You have a more complicated problem because your 15" driver is really a mid woofer. It crosses to the horn at 700 Hz which means it carries a significant portion of the midrange. You really do not want it doing very low bass because that would distort everything else it is doing. JBL needed to use a big efficient 15" midrange driver to keep up with the horn. It was not designed to do really low bass and the specs are very misleading. Ideally you would cross over to subwoofers at around 80 Hz which would clean up your midrange and pass the signal to drivers specifically designed to run down to 20 Hz flat. In my case I used 12" drivers for packaging reasons. I would have used 15" drivers but the size of the enclosures needed to house them would have been prohibitive. I use 8 drivers not to blow everyone away or impress the neighbors, but to form a linear array to match the radiation pattern of my main speakers. For people with point source systems like yours two subs, in your case at least 15", will suffice. You have to hear a system that is capable play low C on a pipe organ. It is a religious experience. 20 Hz is barely audible but boy can you feel it. 

I assume you have been to a large concert or two. The game is recreating that visceral experience in your home. Large venues breath at low frequencies. You know you are in a large space even with eyes closed. A good live recording of a stadium concert should feel the same way. 

I agree with everything @erik_squires says except I am not so impressed with bass traps, digital EQ is way more effective. 

@ssg308 Your speaker's frequency response is rated at one meter. What they do in a 30 foot room is TOTALLY different, not to mention that you need at least an additional 10 dB of gain to get realistic bass levels. You can only do this with 2 15" subwoofers or more in your room. I use 8 12" subwoofers in a 16 X 30 foot room. Each one gets 1300 watts.

As for as your sources are concerned you should have a better DAC, a Bricasti Design M3 would be perfect. Your turntable is not the greatest, but your tonearm and cartridge do not belong in the same room as your amp, preamp and speakers. You do not have to spend big money either. Get a Thorens TD 1600 and put a Soundsmith Voice in it. It will blow your mind. 

It is impossible for me to comment without seeing and hearing the situation. I can say that your system deserves better sources.