Cut lower frequency to help my bookshelf speakers

@arcticdeth... yes also i could sell the dynaudio and buy a floorstand.... but before i want to try to get the best out of the special 25

You can lead a horse to water, but you cannot make him think. 

Reminds me of a friend with a Ford Pinto. Why won't the Pinto do 125? He was sure the car would be just fine doing 125. So he goes flat out down the Gorge. Columbia River Gorge. Big downhill grade. Miles long steep hill. Flat out. Almost gets there, too. 120 I think he said. According to the speedometer. Week later, according to the head gaskets he needs a new Ford Pinto.   

Keep it up buddy, keep trying to wring blood out of a turnip. What you will get instead, first scraping, then smoke, then finally the only thing you might just maybe understand, a totally blown little speaker. Perfectly good speaker, ruined by rank mulish stubborn refusal to learn.   

Only thing I am trying to understand, why come here if all you are going to do is refuse to listen to all the good advice? Why not just plug the speaker straight into the wall, put it out of its misery? Where you are headed anyway.

i see… the best is to sell the dynaudio and get a floorstand speakers I guess

Finally!

Now, the 98dB speakers I mentioned before, Tekton Double Impact and Moab, both are right about 98dB, both will give you the bass impact at volume you are looking for. Without a lot of power. Remember 98dB is ten dB greater than your 88dB speakers, meaning they will play as loud with ONE TENTH the power! ONE TENTH! And people wonder why I keep harping on speaker sensitivity. 

Plus even better in terms of dynamics, speed, detail, tone, imaging- they will walk all over what you have now. Absolutely magical perfect midrange. AND all the slam you ever could want.

All you have to do is stop trying to wring blood out of a turnip, go and buy a side of beef.

Using subwoofers without a dedicated two way crossover is just a cheap and very inappropriate path into subwoofer

What it means is he doesn't understand bass, or subwoofers- or crossovers or EQ. If you have the time and energy you are welcome to click the name and read the posting history, where eventually it will become apparent this is all part of a pattern. Sorry. Please disregard. 

The problem is like russ69 said if you cut the lows you will only turn it up louder and be right back where you are now. You cannot cut enough, because then you will be above the frequency suitable for subs. Your statement "i want to try at least to get the best out of them" begs the question. You already are getting the best out of them!

 You cannot wring blood out of a turnip. Don't put legs on a snake. How many more ways can we say this? Cue Obi Wan Kenobi: These are not the speakers you are looking for!

You are trying to get high volume from a small inefficient speaker. No matter what you do the most likely outcome is you destroy those speakers. If indeed you have not managed to do so already. When you hear the sounds you describe, in my book and in most cases the damage is done.

The "punch" you want does not come from subs. You can add all the subs you want, really good ones too, and still blow those little speakers trying to play them loud enough to get the feeling you want. What you need are Tekton Moabs or something like that. Because the punch you want is above the 80Hz or so frequency range of a sub. And even the top end range of the sub at 80 is beyond the capability of those little inefficient speakers to output at convincing volume. You are in other words trying to put legs on a snake, never a good idea.

If the search I did is right, Dynaudio Special 25 is a $5k two-way speaker with an 8" "woofer" and only 88dB sensitivity. A poor choice for anyone who wants to feel the music. Rather than chase futile dreams of being able to EQ a square peg into a round hole you might want to consider simply replace those awfully inefficient speakers with ones actually suited to what you want.

This is not only the only solution, it is also the most cost-effective, since as soon as you get a proper 98dB sensitivity speaker it will cut your amplifier power needs to a tenth, and you will be able to ditch ML for better sounding and much less expensive amplification. Win-win.