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
aurgolo OP
16 posts
 

"Both the 2x4 and 2x4HD use the same DAC the difference is the better DSP engine"

got it!
aurgolo OP
16 posts
 
I found another solution:

the node2 on the rear panel has the analog output L\R and a single sub rca out with high pass filter (which means that when i enable the sub out i can cut the main rca L/R out from 40 to 200 hz)

i can use that ... in this way no minidsp in the between pre and amp and no double conversion AD/DA
(even if the node2 onboard filter is not the best of the best i avoid the double conversion with the external minidsp)

then i will connect the sub rca out of the node2 to the first sub and daisy-chain the second sub (or split the cable)... at the very end calibrate them with the iphone app and their dsp

I should only check if the node2 output level controls both rca and sub out... but i think yes, why not




 
mapman's avatar
mapman
22,088 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
8,473 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. 
More to discover