What are ways to fix speaker dips in my speaker or audio room

Edit: my ceiling is 2.8 meters tall 

Ok imagine a prison cell I mean the bars of the cell my ceiling is made of wood, the wood that goes along my entire ceiling works exactly like a baffle so I’m guessing a lot of the bass just stay up there the acoustic engineer just says I don’t need anything up there it’s like one “BIG ASS BAFFLE ”

my ceiling is made from wood nothing else 

my acoustic engineer said I don’t need absorbers because of my ceiling there is no echo and it’s pretty lively sounding do to the sound leaving the room

Not sure this information is necessary:)
and me being all over the place with my grammar.

Shawarma, the wavelengths are too long to be affected by your ceiling in any meaningful way. At higher frequencies yes but, not in the bass. If you use a digital preamp like The DEQX Premate, the MiniDSP , The Anthem SLR or the Trinnov Amethyst you can correct this at the listening position nicely but there will still be areas in the room that will be out. Play a bass heavy song and walk around your room. You will hear the character of the bass change as you move around. If you move the measurement mic just a few feet you will get an entirely different frequency response curve. It is just the nature of the beast. Some rooms are better than others. Bass is particularly difficult and all the room treatment in the world will not change that. Room treatments are very useful at higher frequencies. Best is to use speakers with controlled limited dispersion but still bass will be a problem. This can be fixed at the listening position with DSP at the expense of amplifier power and worse response at other places in the room. 

This can be fixed at the listening position with DSP at the expense of amplifier power

In fact you may clip the amps with ease yet not fix the problem of a loss of bass. This is because the waveform is cancelling itself out. You can put a lot of power into that and not get anywhere.

That is why I recommended a Distributed Bass Array (multiple subs) since that will break up the cancellation. Then you can dial it in with the DSP if you want, but that will be minor compared to what the DBA will do.