Peaks in the driver’s response - do a notch filter in the crossover.
But dips in the driver’s response?
I haven’t designed the crossover for my 1st design yet (I’m still on the cabinets) but a friend who has the same drivers (10 inch PHL midranges) measured some response dips that are not small.
Other than buy an EQ what can be done?
In either passive or active speakers?
You can't create energy, but there are shelving filters for bass or dipoles, like the Linkwitz transform
- do midrange notch *boost * (filters) exist?
But dips in the driver’s response?
I haven’t designed the crossover for my 1st design yet (I’m still on the cabinets) but a friend who has the same drivers (10 inch PHL midranges) measured some response dips that are not small.
Other than buy an EQ what can be done?
In either passive or active speakers?
You can't create energy, but there are shelving filters for bass or dipoles, like the Linkwitz transform
- do midrange notch *boost * (filters) exist?
Not passively. The only way to do that passively is to attenuate all other frequencies and leave the "boost" freq intact, then boost the whole signal. Using passive analog circuitry, this is tough.
Recommend an active 1/3-octave or better EQ; I've heard good things about the Behringer unit that does the automatic calibration. Either that, or a Soundblaster Live! in the signal path. It has a DSP powerful enough you can define your own parametric EQ's and deal with the individual bumps in response, as well as giving you a stereo 3-way active xover.
Oh wait. There is one other thing you can look at; you can design the box / baffle / tube / whatever to attenuate that frequency. I've long had the idea of using a very intricately detailed baffle to flatten out a tweeter reponse to +/- .1dB, but I haven't the tools to do such a thing yet. Anyway, here's an article for you to chew on:
http://www.gmi.edu/~drussell/GMI-Acoustics/Filters.html
Enjoy!
Recommend an active 1/3-octave or better EQ; I've heard good things about the Behringer unit that does the automatic calibration. Either that, or a Soundblaster Live! in the signal path. It has a DSP powerful enough you can define your own parametric EQ's and deal with the individual bumps in response, as well as giving you a stereo 3-way active xover.
Oh wait. There is one other thing you can look at; you can design the box / baffle / tube / whatever to attenuate that frequency. I've long had the idea of using a very intricately detailed baffle to flatten out a tweeter reponse to +/- .1dB, but I haven't the tools to do such a thing yet. Anyway, here's an article for you to chew on:
http://www.gmi.edu/~drussell/GMI-Acoustics/Filters.html
Enjoy!
Thanks I think you’re mostly right.
Passive boost as you describe is complex and inefficient.
EQ by Behringer is effective and easy, but I believe also introduces quantisation (sp?) errors
Baffle design can attenuate, but can it boost?
I’ll have to borrow Lancaster’s book on active filters and see if there is a circuit there.
Passive boost as you describe is complex and inefficient.
EQ by Behringer is effective and easy, but I believe also introduces quantisation (sp?) errors
Baffle design can attenuate, but can it boost?
I’ll have to borrow Lancaster’s book on active filters and see if there is a circuit there.
passive boost circuit
a site on studios, talks about a passive boost circuit:
http://home.online.no/~jaeioluf/sound/eqpassiv.htm#PBU
a site on studios, talks about a passive boost circuit:
http://home.online.no/~jaeioluf/sound/eqpassiv.htm#PBU
Nappylady said:
Are you serious? I have a spare Soundblaster card laying around. And I have a SoundBlaster Audigy II in the computer right next to my amp at work. How do you get the signal into the thing? Through the microphone jack? And how do you program it?
Use the line-in jack, or if you can use the digital jack, that's about infinitely better. The built-in ADC has about a 50 dB signal-to-noise ratio.
Then download the kX drivers.
http://kxproject.spb.ru/index.php?skip=1
DISCLAIMER: you must be running Windows 2000 or XP. It may make things worse for you. In any case, have your current drivers ready to install in case things go awry.
Read the documentation. There is a steep learning curve, but it's worth it. The DSP inside the EMU10K-based cards is absolutely amazing in its power. I want a rack unit based on it. 😀
Good luck!
Then download the kX drivers.
http://kxproject.spb.ru/index.php?skip=1
DISCLAIMER: you must be running Windows 2000 or XP. It may make things worse for you. In any case, have your current drivers ready to install in case things go awry.
Read the documentation. There is a steep learning curve, but it's worth it. The DSP inside the EMU10K-based cards is absolutely amazing in its power. I want a rack unit based on it. 😀
Good luck!
Shocker! You beat me to the punch!
that's what I get for using Suspend-To-RAM mode on my computer... I leave my reply unposted for two days and someone beats me to it.
that's what I get for using Suspend-To-RAM mode on my computer... I leave my reply unposted for two days and someone beats me to it.
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