Cut lower frequency to help my bookshelf speakers


Dear All,

I try to open a new topic… which i did not find in the previous discussion so maybe is new to the most

 I have a 2 channels system which i want to improve with a minidsp or eq

the question in short is the following:

i love my dynaudio special 25 speakers but often i feel the need to have a better punch on the bass frequency

so i tried to add a couple of svs 1000 pro subs… with excellent results

point is that when i turn up the volume too much i feel the dynaudio midwoofer cone rattle when hit the lower frequency (actually the coil reaches the end of the air gap into the magnet)

so im thinking to add a dsp or eq to cut the lower frequencies before they reach the dynaudio

i have a pre audio research LS2 + amp mark levinson 23.5….. the idea is to add the dsp or eq in the middle and have the following configuration:


  1. connect the minidsp or eq. to the first rca out of the audio research (fortunately i have 2 rca and 2 din outputs) and then to the mark levinson …. in this way i could to cut all the bass frequency under 50 or 60 hz and have the levinson handle  the dynaudio 


  1. connect the 2 subs to the second rca out of the audio research and use the svs internal dsp with iphone app to calibrate them


Hope is clear… What do you think?


Better a miniDSP 2X4 or a Schiit loki mino+


Or anything else?



tks alot for any help or useful hint, best


Andrea


aurgolo
The simplest is to use a passive XO to roll the lows out of the mains
see  ieLogical SubterraneanHomesickBlues for the trials and tribulations of integrating subs with small mains. 
see http://www.ielogical.com/assets/Audio/PassiveXO1.png for passive XO example. 80 [≈4nF] to 90Hz [≈3.5nF] should be about right. 

CA 25's won't ever play as loud as Moabs, but should give a relatively tolerable 90db in a small room. If 5x8 is meters, they may be a bit small unless very close.

Check the woofers for damage by pressing gently either side of the dust cap. If there is any scratching, the woofers are toast.
Here is a nice summation of several reviews of subs and how they were implemented: https://6moons.com/industry_articles/kef-herb-john/

You can also click on the links to go in depth with the few reviews referenced.

All the best,
Nonoise
@OP, 
You should have bought Vandersteen subs.
They utilize an external crossover that cuts off the speakers at 80-100 hertz and relieves your amp from the power consuming bass notes.
They integrate easily. All you need to know is the amplifier impedance.
I can attest to the fact that they are built like tanks.- I owned 2w subs that were nearly 30 years old, yet they still performed as should.
Bob
@aurgolo - metric, nice, you're speaking my language.
That's a good sized room, depending on the ceiling height it's not a bad proportion either. Decent size for a floor stander, it would take a pretty exceptional stand mount and amplifier combo to really energise that volume to high SPL (sound pressure levels, volume)
It would seem you're hitting the Xmax, the travel allowed on the driver when it was engineered, and not clipping from the amp right?
The speakers are rated at 200watts, what amplifier are you driving them with?