Recent content by Sliderule

I don't think REW supports simultaneous multichannel measurements.

Thx for your input. As it rules out amplifier/signal chain variation it leaves the size of the speaker/transducer size as the main variable. The new speaker has at least 16 times the radiating area of the of the RTR tweeters that measured flat. The speaker has 7 vertical columns segmented in...

Hi John, Thx for the quick response. I have an amplifier with none/minimal group delay that measures high frequency speaker signals with no problems. Measuring the the new speaker with a sound level meter using the signal generator shows the speaker is not drastically rolling off the high...

I recently bought some new speakers and decided to run frequency response plots on them. The plots were showing an 18-22dB level drop off from 11KHz to 20KHz. (See screenshot) I had run plots full range with my previous 4-way speakers over the past 12 years with with no high frequency rolloff...

White making frequency response measurements of my speakers I noticed that the high frequency rolloff was excessive. It was 16-25dB down from 1oKHz to 20KHz. The calibration frd was working fine with my ancient Mobile Pre audio interface (which finally died) and REW which I confirmed by...

I had imaging issues with poor left speaker imaging. While going thru my REW files I noted that the right speaker was 4dB higher than the left speaker. Although I had set both amplifier gains to full apparently the left channel had been moved. After resetting it I them measured near field...

I am having problems with ASC support responding. Vince can you send me a text and I will respond within 30 minutes (doing yard work) -david

I did run a test and have attached two screen shots. It is eay to see the suckout improvement at 194 and 183Hz. It doesn' t show in the picture but my rolls were sealed in plastic with a small opening on the exterior of the roll. The R12 must be Canadian because I could not find it my area...

Hey, some great suggestions. I have been making measurements and doing listening tests. By moving the speakers out 5' from the back wall and running REW tests the measurements stay the same but the stereo imaging on the left speaker fills in and becomes solid. Due to irregular back wall...

One of the things I did today was to make frequency sweeps with the mic @1ft, 4ft, and 8 ft from each speaker. I have the attached the screenshots 207 is 1ft and 208 is 4 ft. Note the 8 ft distance looks the same as the 4 ft. The 4 ft phase reversals show the reflection effects on the...

Hi Vince, I am in South Carolina. I did some tests moving the mic ahead of the listening position so I could determine if reflections from the 1/2 wall or the back wall (17') were affecting the measurement. It is obvious that the reflected and the direct signal are interfering at the...

I had to look up SBIR (Speaker Boundary Interference. It usually refers to to non dipole 1/4 wave interference. I realize that there is comb interference with dipoles. As the right speaker is a long way from a side wall it has a longer path for the for the back wave to reach the listening...

They are 3'. As much as I would like to place them out at 5' the waf (wife acceptance factor) would fall drastically. I am well aware I will have to treat the wall behind the stats. The left speaker, because it is near a sidewall. The group delay between the left and right speakers is inverted.

I have attached a picture of my system and 4 REW screen shots. Left and right speakers frequency and phase response (203 & 204) and group delay (201 & 202). The problem is the suckout about 200Hz. I had the same suckout with my previous speakers. The speakers are Soundlab 745's full range...

Thx for all your help. Have M2 up and running fine. Have already run multiple sweeps to start analyzing system -david white