Some help needed...

[Marcus DiBenedetto]

Hi, I am having a problem getting REW to work properly. Well, it could be operator error. I'm using version REW_windows-x64_5_20_RC2. My system has two SVS SB13Ultra subs (with their amp upgrade).. I ran Audyssey successfully using the Audyssey app. I turned Audyssey off. I rechecked volume using an SPL meter. All speakers and subs are 75 Db. I set up REW with a minidsp_UMIK-1 and 90 degree calibration file. HDMI from my laptop to my Marantz AV8805 Pre/Pro. I took many measurements, left sub, right sub, both subs, all graphs look similar. I turned off my speaker amplifiers to insure I am getting a signal from each sub and ran another set of measurements. All are similar. I fiddled with the pro/pro to make sure the subs would produce a signal. In desperation, I played a series of sub tone (10Hz up to 200Hz.). I could hear each tone at my MLP clearly and seemed to me to be equal volume. In fact, 10Hz tone rattled my room pretty good. Please take a look at the graph I posted with this message. I would appreciate the help.

Marcus

 

[sam_adams]

Did you install either ASIO4All or FlexASIO as the sound drivers to send the sweep stimulus to individual channels?

 

[Marcus DiBenedetto]

No. I am using JAVA.

 

[sam_adams]

Download either ASIO4All or FlexASIO and install on your laptop. Member @AustinJerry has put together an excellent how-to on REW which includes a section on ASIO drivers and their configuration which can be downloaded from his DropBox account.

 

[McFarmer]

I had a similar issue and AustinJerry's excellent instructions for setting up the computer sound source and ASIO drivers solved the issue. I had to fiddle with the ASIO Control Panel on the Preferences tab to get the mic and sound source active. I would install the drivers before doing the computer setup which might have helped. LFE is channel4.

JAVA did not work for me regardless of what I tried.

 

[Marcus DiBenedetto]

Thanks, I will give it a try.

 

[Marcus DiBenedetto]

Maybe I got this figured out. Ran a couple sweeps which look much better.

Settings: Crossover is 90 Hz for all speakers. No smoothing. FlexASIO, Output 4: Out 3. Input 1: In 0. Timing Reference 1: Out 0. Driver type: Windows Direct Sound. Purple line is both subwoofers and Audyssey is off. Blue line is both subwoofers Audyssey is On.

Am I on the right track? If yes, I will run more measurements.

Marcus

 

[sam_adams]

That looks much better. The sweeps look like what should be expected.