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I have Infinity RS-1b speakers using a DBX 2 way crossover (instead of the Infinity crossover). There is a bass hump in the woofer towers in the lower mid-range I want to get rid of. I know I could get an equalizer to control it, but the thought of putting the signal from my Audio Research LS-15 preamp through the equalizer to the mid/high tower doesn't make sense to me.I could set the high frequencies flat, but I am assuming the preamp is not flat and I don't want to change the character of the preamp. Could I put the line out from the eq only into the low end of the DBX, and continue to put the output from the preamp into the high input on the DBX? The woofer towers are stereo, and not meant to be summed like a sub-woofer.
Suggestions welcome.
Bill
I want to die like my grandfather-peacefully in his sleep, not like his passengers, crying and screaming!!
siramazing (A)
"There is a bass hump in the woofer towers
in the lower mid-range I want to get rid of..."
By looking at the http://images.google.com/imgres?imgurl=http://www.linaeum.com/productinfo/other/infinity_cascade_driver,
you will notice a large increase in the frequency response
from 600 Hz to 1.4 kHz; almost a 5 dB in change. Coupled with
the weakness in the 400 to 800 Hz range this bass-hump would appear
louder than normal.
Using additional filters circuits will not correctly take care of the
RS-1b natural frequency response, just cover it up.
There is no easy fix other than rebuilding the RS-1b system,
use a flatter woofer, far cross-over points, etc.
CJ Larson [A]
Aah, in a perfect world a re-build is a fine idea if one has the technical expertise (which this one, does not). I have been experimenting with an SAE parametric I got on E-bay, and it does help. It reduces the hump and helps the clarity of the mid/range woofer towers by reducing the output of the woofers at that frequency. The RS-1b is not perfect, but it's still an amazing sounding product.
I want to die like my grandfather-peacefully in his sleep, not like his passengers, crying and screaming!!
This will work fine for your app
Thanks for the heads-up.
Bill
I want to die like my grandfather-peacefully in his sleep, not like his passengers, crying and screaming!!
You can run through the DBX unit then on the low output run into a stereo
Parametric such as a Rane parametric
Then you can dial right in on the freq and use a minimum amount of bandwidth needed
I assume that you are running your speakers two-way active, in which case the solution is quite simple: Put the eq between the DBX low output and the bass amp.
You will of course need a stereo eq, preferably a parametric one.
will you explain the difference between the parametric eq and the graphic?
thanks,
bill
I want to die like my grandfather-peacefully in his sleep, not like his passengers, crying and screaming!!
With a graphic eq you've got fixed frequencies which affect a fixed bandwidth.
In a parametric you can adjust the centre frequency and the bandwidth (Q) it affects.
The advantage of the parametric is that, if you got a wide response hump, you only need one band to 'fix' it where you would have to use may be four or five bands using a graphic ie less processing equals less components in the audio path.
Conversely you may have a narrow spike in the response which does not lie exactly where a graphic has its centre frequencies. A parametric can be adjusted so the centre frequency correlates
exactly to the problem area so you fix only what needs fixing without creating problems in frequencies close by.
The advantage of a graphic is that it is a lot easier to use and you have a graphic representation of what you are doing.
thanks for the replies--the suggestion regarding putting the eq after the dbx and then just running the eq to handle the bass makes a lot of sense. I think I am going to experiment with a used graphic for not a lot of money off of ebay, and then if I like what it does (or if it doesn't quite do the trick) look into a more expensive parametric.
Bill
I want to die like my grandfather-peacefully in his sleep, not like his passengers, crying and screaming!!
Parametrics go surprisingly cheap on ebay at times.
I bought a nearly new parametric eq for 1/10th of the new price.
ps: Love your tag line, makes me laugh everytime I read it!
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