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

I have recently hired an acoustic engineer and after a day of measuring room acoustics and he came back with what I needed to fix and one of my speakers dip at 54 HZ and would DSP help or a lot of bass traps in the frequency work better?

@shawarma
If you are really talking about a dip of only .8dB at this frequency, its not a concern. Imaging will not be affected in the slightest.

If the dip is 8dB and not 0.8dB, then as long as the speaker itself is OK, its unlikely that bass traps and DSP will help out, since the dip will be caused by a standing wave. To fix that you have to break up the standing wave, and that is done by using at least a couple of subwoofers that are asymmetrically placed in your room (assuming that the main speakers are otherwise full frequency). The asymmetry is what breaks up the standing waves. The subs must not have any output above 80Hz or else they will attract attention to themselves.

54hz dip is probably the ceiling cancelation in a room with your geometry. 
How tall is your ceiling? 54hz is a 5’ quarter wave (see chart below, 54hz is 20 feet long). So most likely the ceiling.
Moving the speakes around probably will not fix it as the ceiling height is fixed. I have a similar issue. You can trap the ceiling (which I did) and it helped a bit but not as much as I had hoped. Subs with DSP, preamp with tone controls or an equalizer are probably the realistic options.

http://www.soundoctor.com/freq.htm

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.