Hello HTS and company,
I have long been a fan of DIY but other than build a box and throw a woofer in it and use a half baked off the shelf XO solution, I have been afraid to try to measure speakers and learn what the data means and how to use it... until now! :surprise:
I have built a 2 way system for the theater L C R. They consist of a 3X JBL AS2225STD (2X2226 and 2446/2380a per cab) with the Ti diaphragm removed and a Truextent Be installed in it's place. Amps are Crown DCi 8|600N's (my DSP).
I have had a relatively easy time using REW because of all of the fantastic documentation and just the fact that REW is a really great piece of software, Thanks John!
I have measured my center speaker at 1 meter at approximately the height of the listening position if you were to string a string from where the horn meets the woofer on the baffle to the listening position. So now the mic is at about 39" X 50". I have 3 full freq. sweeps with the timing reference as the left channel. One of both drivers, one of the HF and one with the LF. The center delay on both driven is 1.48ms as is the HF only driven sweep delay. The LF delay is 1.65ms. I am still unsure if I am doing it right though.
So my question is: Do I just subtract 1.48 from 1.65 to arrive at .17ms as a delay for these drivers? The XO recommended for the system is 18db Bessel for both HP and LP so mine is at 800hz 18db Bessel.
The weird part to me is that the horn sits all the way to the back od the box and the 2226's have about 5-6 inches of clearance to the back of the box so the delay's I am seeing look backwards to me. Maybe it is the XO's that are providing to current time alignment?
Any help or reading that I can be pointed at would be greatly appreciated.
Thank you in advance! :nerd2:
I have long been a fan of DIY but other than build a box and throw a woofer in it and use a half baked off the shelf XO solution, I have been afraid to try to measure speakers and learn what the data means and how to use it... until now! :surprise:
I have built a 2 way system for the theater L C R. They consist of a 3X JBL AS2225STD (2X2226 and 2446/2380a per cab) with the Ti diaphragm removed and a Truextent Be installed in it's place. Amps are Crown DCi 8|600N's (my DSP).
I have had a relatively easy time using REW because of all of the fantastic documentation and just the fact that REW is a really great piece of software, Thanks John!
I have measured my center speaker at 1 meter at approximately the height of the listening position if you were to string a string from where the horn meets the woofer on the baffle to the listening position. So now the mic is at about 39" X 50". I have 3 full freq. sweeps with the timing reference as the left channel. One of both drivers, one of the HF and one with the LF. The center delay on both driven is 1.48ms as is the HF only driven sweep delay. The LF delay is 1.65ms. I am still unsure if I am doing it right though.
So my question is: Do I just subtract 1.48 from 1.65 to arrive at .17ms as a delay for these drivers? The XO recommended for the system is 18db Bessel for both HP and LP so mine is at 800hz 18db Bessel.
The weird part to me is that the horn sits all the way to the back od the box and the 2226's have about 5-6 inches of clearance to the back of the box so the delay's I am seeing look backwards to me. Maybe it is the XO's that are providing to current time alignment?
Any help or reading that I can be pointed at would be greatly appreciated.
Thank you in advance! :nerd2: