Hi @Mark63 ,
To answer your question : no, don’t buy new speakers, at least not yet.
Your measurements aren’t so bad. It could be worst, trust me.
I wouldn’t worry too much about the low end as you won’t be able to really correct that. I would worry a lot more about the 250 Hz – 1 kHz range…
There are some rooms posted on System Pics 2020 that probably measure even worst, and their owners seem to be satisfied.
This tells us a lot about how our brain can manage and reconstruct all that mash (fill the gaps, attenuate, and so on…). Pretty amazing, isn’t it?
In a regular room, untreated, what reaches your ears is roughly 50%-60% reflections and only 40%-50% of the speakers’ direct sound.
Listening fatigue is a sign that you’re brain is working hard to reconstruct what you’re hearing
Treatment will change that ratio. The more treatment, the more you’ll listen to your speakers. It is that simple. And you might discover that your speakers aren’t so bad. But you may find their limitations as well.
As for your measurements, I suppose you have a calibrated microphone and use it correctly. Be aware that measuring isn’t an easy task. But there is a lot of information available.
What you want to look at when measuring is roughly the following :
A - peaks and nulls (the graph you posted)
B - decay time (waterfall graph)
C - RT60
This will be your baseline for treatment.
A and B are mandatory. You want A as flat as possible and B as even as possible.
C is a matter of taste.
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First thing first, the listening position is the very first thing you need to sort out.
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Then speakers positioning.
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And finally treatment.
If you’re limited in speakers positioning and listening position , then you may somewhat compensate that with the appropriate treatment.
In your context that means covering the back and front walls with something like GIK Monster Bass Traps, and the ceiling with GIK 244. Or an equivalent setup.
If your not limited with positioning then place the speakers length wise.
Now treatment :
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2 or 3 panels won’t do much.
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You’ll need a significant amount or treatment in order to achieve your goal : listen to you speakers.
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Avoid foam and acoustic curtains, at least at first.
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Go for 6 inches thick (or more) Rockwool, or Fiberglass, broadband traps (like GIK Monster Bass Traps).
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Avoid diffusers! Diffusion is really nice, but you’ll need a lot of surface to get a result. Start with broadband traps (like GIK Monster Bass Traps).
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Symmetry is key.
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First reflections points is a good target to start with : left-right, front-back wall.
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Don’t forget the ceiling! Remember, floor to ceiling is a really short distance… and the ceiling is a gigantic flat surface…
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Don’t buy one or two panels “just to try”. It won’t change anything and could generate an imbalance.
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Make a plan. Take your time, and think about it carefully.
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Be aware that it’ll cost you money! My own treatment costed me ~12K euros. And I’ll probably add another 5K.
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You’ll spend at least 1,5K to get a proper result. A cheaper alternative would be DIY.
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Treatment will give you the best ratio performance/cost.
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Read. Watch some videos. Don’t pay too much attention to forums…
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Learning is key. There is some useful info on this thread. If you’re not willing to do some learning, then you’d better hire someone to help you.
Hope this helps