jarrods
02-04-2015, 09:24 PM
I have a dbx 4800 in my system and set EQ using a dbx microphone to be basically flat from 20Hz to 20kHz all seemed OK. Speakers are pair 4344 over pair Sub1500.
Today I took screen shots of the 4800 RTA with the microphone in what I thought was the same position. No longer flat with differences up to 3db. I also have a Dayton EMM-6 microphone and borrowed a friends McIntosh microphone (from the MEN220) so I took captures of them without moving the microphone stand and tip of microphone exact same distance from clasp. All different.
When I did the RTA I pointed the microphone to midway between speakers. Documentation I have seen for dbx and McIntosh suggest this. I have seen other documents and read in forums to point microphone to the ceiling and being omnidirectional that is best way to do it. I took more captures with microphones pointing to the ceiling and again all different.
The quality of the system EQ can only be as good as the microphone. I do not know which microphone to trust most. Many say the Dayton EMM-6 is best but it suggests I need to boost top end more and too me it is already a bit bright so I am inclined to trust the dbx more.
Today I was considering buying a “Dayton Audio OmniMic V2 Precision Measurement System” and have a look at what it thinks the EQ is like using my laptop. But is it just as flawed as the microphones I already have?
Speakers pic is here….http://imgur.com/a/O13gD (http://imgur.com/a/O13gD)
Attached PDF is screen captures.
Today I took screen shots of the 4800 RTA with the microphone in what I thought was the same position. No longer flat with differences up to 3db. I also have a Dayton EMM-6 microphone and borrowed a friends McIntosh microphone (from the MEN220) so I took captures of them without moving the microphone stand and tip of microphone exact same distance from clasp. All different.
When I did the RTA I pointed the microphone to midway between speakers. Documentation I have seen for dbx and McIntosh suggest this. I have seen other documents and read in forums to point microphone to the ceiling and being omnidirectional that is best way to do it. I took more captures with microphones pointing to the ceiling and again all different.
The quality of the system EQ can only be as good as the microphone. I do not know which microphone to trust most. Many say the Dayton EMM-6 is best but it suggests I need to boost top end more and too me it is already a bit bright so I am inclined to trust the dbx more.
Today I was considering buying a “Dayton Audio OmniMic V2 Precision Measurement System” and have a look at what it thinks the EQ is like using my laptop. But is it just as flawed as the microphones I already have?
Speakers pic is here….http://imgur.com/a/O13gD (http://imgur.com/a/O13gD)
Attached PDF is screen captures.