Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums > Audio Measurement and Testing
DIY monitors Smaart
Montez Carter:
I have some 15" X 1.4" DIY monitors that I have made and I have downloaded the Smaart demo program. I tuned them by ear and then placed them outside on my dock away from the building. I ran some pink noize through them and measured with my DBX measurement mic and basically adjusted the levels and applied some EQ to get them fairly flat on the smart RTA screen. They are biamped by Crown XTI 2000's with inserts from DBX 1231's. I then ran some source material through them and swept them with a Shure PGX/Sm-58 capsule wireless system check 1-2 etc. and everything was fine I had decent enough gain before feedback. I did notice my problem freq is 800-1000hz and 2.2-2.5k I damn near have this all the way notched on the DBX to get the amount of GBF that i felt was acceptable. Thanksgiving weekend sound checking and they started whaling something terrible in this same problem range. I notched it out and the graph was butchered by the time I got done. National rappers so most of the music was in sidefills with vocals predominantly in the monitors anyway so they were happy but I was not comfortable. My question is if i move the crossover point from 1.2K where it is now will that help out this problem or is this a phase problem and I am just trying to fix it with EQ. I have the tools but don't know how to use them to fix my problem. So any help would be greatly appreciated.
Timo Beckman:
Could you post screenshots from smaart in fft mode? So the solo response of the high and low driver with phase included
What kind of high and lowpass settings do you use on the monitor
John Halliburton:
--- Quote from: Montez Carter on January 25, 2012, 03:26:41 AM ---I have some 15" X 1.4" DIY monitors that I have made and I have downloaded the Smaart demo program. I tuned them by ear and then placed them outside on my dock away from the building. I ran some pink noize through them and measured with my DBX measurement mic and basically adjusted the levels and applied some EQ to get them fairly flat on the smart RTA screen. They are biamped by Crown XTI 2000's with inserts from DBX 1231's. I then ran some source material through them and swept them with a Shure PGX/Sm-58 capsule wireless system check 1-2 etc. and everything was fine I had decent enough gain before feedback. I did notice my problem freq is 800-1000hz and 2.2-2.5k I damn near have this all the way notched on the DBX to get the amount of GBF that i felt was acceptable. Thanksgiving weekend sound checking and they started whaling something terrible in this same problem range. I notched it out and the graph was butchered by the time I got done. National rappers so most of the music was in sidefills with vocals predominantly in the monitors anyway so they were happy but I was not comfortable. My question is if i move the crossover point from 1.2K where it is now will that help out this problem or is this a phase problem and I am just trying to fix it with EQ. I have the tools but don't know how to use them to fix my problem. So any help would be greatly appreciated.
--- End quote ---
Are your rappers cupping the microphone? Turns a directional mic into an omni.
As for the monitors, more info is needed.
What make/model of 15" woofer, 1.4" compression driver, and what horn?
Are you just using the on board DSP of the XTI amps?
What crossover settings are you using?
Low pass freq.? Low pass filter type?
High pass freq.? High pass filter type?
Gains of each?
Best regards,
John
Montez Carter:
--- Quote from: John Halliburton on January 25, 2012, 08:57:18 AM ---Are your rappers cupping the microphone? Turns a directional mic into an omni.
As for the monitors, more info is needed.
What make/model of 15" woofer, 1.4" compression driver, and what horn?
Are you just using the on board DSP of the XTI amps?
What crossover settings are you using?
Low pass freq.? Low pass filter type?
High pass freq.? High pass filter type?
Gains of each?
Best regards,
John
--- End quote ---
This is what I am using
Woofer: Eminence kappalite 3015/ HPF-60hz 24DB Linkwitz Riley / LPF-1.2K 24DB Linkwitz Riley /polarity +/0 Gain
B&C DE600 1.4" mounted on a B&C ME90 80X60 /HPF-1.2K 24DB Bessel / LPF-14K 24DB Butterworth/ polarity +/-10 Gain.
I am just using the DSP from the crowns(crossover and gain only) and I have not did any parametric cuts as I did them all with the 31 band. And yes I could see them cupping the Mics. The point is I am just now getting into SMAART so the only thing I have pulled up is the RTA but for phase if some one can direct me I can use FFT to look at phase as that is where I am thinking the problem lies. Am I on the right track?
Paul Tucci:
--- Quote from: Montez Carter on January 25, 2012, 04:13:14 PM ---Am I on the right track?
--- End quote ---
Montez,
No, you are not on the right track. You are suggesting the solution will be in the phase domain after questionable use of the energy domain. Your investigation needs to proceed logically and with rigor. I suggest understanding before taking action. Moving the crossover might make an improvement or it might cause other problems. An understanding of the problem will lead to the appropriate action.
Using PSW as a resource is a good idea. The experienced voices can offer good advice.
PT
Navigation
[0] Message Index
[#] Next page
Go to full version