2. speakers
  3. 166986-153302

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
mapman's avatar
mapman
22,210 posts
 
No. Lower frequencies require exponentially more power. Its where most of the work is done, especially if we are talking full range down to 20hz. Smaller drivers will have to work much harder to produce those lows than larger all else remaining the same, just like a smaller engine in a larger car.   Smaller drivers will tend to heat up more and compress.   So it’s always advantageous to have the transducer best suited to handle the frequency deliver the frequency. Even more important is we are generally talking about powered subs which also typically provide a beefy amplifier specifically designed to deliver the power needed for that flat extended bass. Most main amp/speaker combos will never be able to keep up with a good powered sub in terms of delivering clean, undistorted, extended bass. It’s also more cost effective and practical to buy a powered sub for that purpose. Full range speakers capable of doing it will tend to be be large, heavy and pricey if also built well. But of course as always, there are many ways to slay the beast.
jjss49's avatar
Ag insider logo xs@2x
jjss49
6,612 posts
 
this thread should be retitled ’why can’t i get my bedroom dresser into the back of my ford fiesta?’ :)

small drivers in small cabinets can give you good bass... but only up to a certain point

hope the op has the info he needs to move forward
mijostyn's avatar
mijostyn
8,570 posts
 
Aurgolo, just what I said. Adding a high pass filter to the main speakers doubles the price of crossovers, and cables increasing the expense and complexity of adding subwoofers. So, to save money and make hook up easier manufacturers just delete the high pass filter. Even if your main speaker can not radiate 20 Hz that does not mean it is not going to try to do it and you can see your woofers wobbling around. These long excursions distort all the other frequencies the woofer is carrying. A high pass filter is necessary so that you can create a smooth crossover better integrating the subwoofer and eliminate low frequencies from the main speakers and their amplifier. This also dramatically increases you headroom overall. Giving you less distortion and more volume. 
This is one issue those of us who have been using subwoofers for decades rail against. You add subwoofer to get lower bass and to clean up your main speakers. Both issues are just as important. It is true that some types of speakers benefit more than others. For speakers that have a woofer that crosses out at 150 Hz the benefit is much less than for a speaker that's woofer crosses out at 2000 Hz. You can get a MiniDSP for $250.00 that will give you an excellent 2 way crossover along with full EQ cababilities. 
russ69's avatar
russ69
3,508 posts
 
"....You cannot wring blood out of a turnip..."

This is the key point. The loudspeaker designer already got everything he could get out of the design they produced. The idea that you can equalize a loudspeaker system into doing something it just can't do will just make the problem worse. Subwoofers are not very good woofers and the heavy stiff cones and low frequency cabinet/driver design will not do a very good job trying to be a 3rd way in your loudspeaker system. Equalizers and crossovers can only do so much and they work best when you are cutting gain, not trying to add high energy frequencies outside their operating range.  
mapman's avatar
mapman
22,210 posts
 
You can get a MiniDSP for $250.00 that will give you an excellent 2 way crossover along with full EQ cababilities.


Can you provide a link to the exact model please?  Thanks.
More to discover