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My REW experimentation in my basement system (1 Viewer)

3dbinCanada

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I've been busy with REW lately..using it yesterday to find the best location for my single sub. I found it left of the fireplace as shown below. The couch spans 6' across so I took 3 measurements, at the center, 24" to right of center, and 24" left of center.
Main-3.JPG

Here's just the bass response with no PEQ;
sub_at_new_location.jpg

Today I took full frequency sweeps with various settings of YPAO. The results are not very good and I'm wondering if being too close to the backwall is the culrprit at play. The mic is only 19" from the back wall. Here are the results at 1/6 smoothing for each of the PEQ curves. Crossovers were set to 80 Hz

YPAO=Flat
Flat@80Xover-6.jpg

YPAO=Natural
Natural@80Xover-6.jpg

YPAO=Front (based on the Main capabilities)
Front@80Xover-6.jpg

YPAO=Off
Thru@80Xover-6.jpg
 

Dave Upton

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I've been busy with REW lately..using it yesterday to find the best location for my single sub. I found it left of the fireplace as shown below. The couch spans 6' across so I took 3 measurements, at the center, 24" to right of center, and 24" left of center.
View attachment 88038

Here's just the bass response with no PEQ;
View attachment 88039

Today I took full frequency sweeps with various settings of YPAO. The results are not very good and I'm wondering if being too close to the backwall is the culrprit at play. The mic is only 19" from the back wall. Here are the results at 1/6 smoothing for each of the PEQ curves. Crossovers were set to 80 Hz

YPAO=Flat
View attachment 88040

YPAO=Natural
View attachment 88041

YPAO=Front (based on the Main capabilities)
View attachment 88042

YPAO=Off
View attachment 88043
Looks like your main issue as at the crossover. Have you experimented with having your crossover lower or higher (60 or 100Hz) and adjusting subwoofer distance?
 

3dbinCanada

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Looks like your main issue as at the crossover. Have you experimented with having your crossover lower or higher (60 or 100Hz) and adjusting subwoofer distance?
I was about too but my mic is no longer working. When I plug it in to the laptop, the light on the mic doesnt turn on nor does the PC see it. I have a ticket open with minidsp.
 

3dbinCanada

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Time to update this thread. I thought I had. My apologies. I retook a Full Frequency sweep raising the head of the mic just a couple of inches past the top of the chair back and it cleaned up the measurements. No more deep notch between 85 and 110Hz.

FLAT Across 3 LP.jpg
 

3dbinCanada

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While the weather is nice and the daylight hours are long, I will not spend much time on getting the new sub integrated into the system. Thankfully, I did keep my old measurements when I went through this exercise looking for the best location for the current sub.

The new sub location frequency response is this.
sub_at_new_location.jpg

Out of the next three locations , I will locate the 2nd sub to the right of the sofa almost opposite corner of the new location.
sub_at_right_of_sofa.jpg

The other two locations were left of sofa and by the exercise bike.
sub_at_left_of_sofa.jpg

sub_at_bike_location.jpg
 

Dave Upton

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Looks like you have a pretty good in-room response. Are you going to integrate your subs with a miniDSP?
 

3dbinCanada

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Looks like you have a pretty good in-room response. Are you going to integrate your subs with a miniDSP?
A miniDSP HD-4 to be exact. I already have one in use in my greatroom setup. I got a deal on the 2nd mini I couldnt pass up on which led to the purchase of the 2nd sub. This upgrade path almost spun out of control on me. :P Im glad I kept my measurements when I only had the one sub because it greatly reduces the amount of work trying to find a 2nd location.
 

3dbinCanada

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I got the 2nd sub dialed in I think. Here is the raw response before adding a house curve via the miniDSP. The 2nd sub was first gain matched my ensuring the SPL at 50 Hz was the same for the 2nd sub at the 1st subs location.

Individual and Combines Sub Response.jpg
 

3dbinCanada

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The first graph are plots along the width of the couch before EQ via miniDSP.
C_L_R LP Before EQ.jpg

The second graph are plots along the width of the couch post EQ via miniDSP
C_L_R LP Post EQ.jpg

I'm going to have play with the EQ a bit more with the miniDSP as I'm not satisfied with the drop in output from PreEQ to PostEQ and the difference between the 3 LPs
 

3dbinCanada

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You're making good progress. Did you use a house curve target when correcting, or manual EQ?
For the EQ, I chose the slope of the bass to be +10db higher between 20 and 30 Hz and be down at 10 db at a 100 Hz based on the Youtube video stating that the lower frequencies (20-30) need to be 10 db louder than at 80 Hz.
 

3dbinCanada

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I've played with REW EQ some more and this what I managed to get. I haven't taken any measurements yet as I'm too tired coming from a 75km bike ride. I took a snapshot of the settings as well.

REW Config3 For Basement.jpg

REW Config3 Settings.JPG
 

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