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

You hired a "professional" to listen to a home stereo.

Time to find a hobby outdoors. Stay off the forums.

Hello,
That is like a mechanic saying you have squeaky breaks but not tell you how to fix them. He could have done a near field test to make sure one speaker is not hotter than the other on its own or swapped the speakers to see if it is the speaker or the electronics. You can test that yourself with an SPL app on your phone and stream 1khz pink or brown noise. Once you narrow it down to the speaker or component you can address that issue. It might be as easy as adjusting the output bias on the amp with a voltage meter. IF YOU ARE NOT FAMILIAR PLEASE FIND A PROFESSIONAL TO SET THAT FOR YOU. Capacitors can change and you need to recalibrate. Start with swapping the right and left interconnects from a source to see if it is on one channel and not the speakers while using the SPL App. Always room treatment before DSP. If it isn’t any of your equipment or speakers it means it’s the room. If you can play with speaker setup. 1/4” at a time. Wilson has been studying this for a while. If your speakers are rear ported you might need defusers behind your speakers or on the back wall. 1. Find out if it’s the room, speakers, or the electronics. 2. Address that issue as stated above
3. Always room treatment and or speaker placement before DSP. I hope this helped because I know your sound engineer did not. 

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.