Need advice on sub cal and room layout.

gpershall

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Aug 11, 2018
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!st time REW user, Marantz 7013, 2 SVS SB13 subs, Martin Logan XT40 LR mains, Martin Logan XT50 center, Martin Logan surround and Atmos in ceiling.
Did a 1st run of REW and the results are less that good, IMHO. I have done no EQ or movement of the subs. Both subs have been upgraded to the new SB13 bluetooth amps. Looking for recommendations in how to tackle the sub placements, EQ, etc. Willing to purchase a MiniDSP if recommended.
The attachments are the REW results and 2 views of my room. The subs are on either side of the L and R mains. The UMIK1 was placed in the left brown chair in the 1st photo
 

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Sonnie

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Location
Alabama
My AV System  
Preamp, Processor or Receiver
Monolith HTP-1 Processor (Movies and Surround)
Main Amp
Sanders Sound System Magtech (Dual Amps)
Additional Amp
Emotiva XPA-Eleven
Computer Audio
Intel NUC w/ Roon ROCK
DAC
miniDSP SHD (Two-Channel Music Only)
Universal / Blu-ray / CD Player
Panasonic UB9000 4K UHD Player (for media discs)
Front Speakers
MartinLogan Renaissance ESL 15A
Center Channel Speaker
MartinLogan Focus C-18
Surround Speakers
MartinLogan EFX Surrounds
Surround Back Speakers
MartinLogan ElectroMotion ESL
Front Height Speakers
MartinLogan EM-IC
Rear Height Speakers
MartinLogan EM-IC
Subwoofers
SVS SB16-Ultra x4 (music) + PB16-Ultra x2 (movies)
Other Speakers or Equipment
VTI Amp Stands for the Magtechs
Video Display Device
JVC DLA-NX9
Screen
Elite 128" Screen
Remote Control
Universal MX-890
Streaming Equipment
Roku Ultra
Streaming Subscriptions
Lifetime Roon Subscription
Tidal
qobuz
Netflix
Amazon Prime
Satellite System
Dish Joey 4K
Other Equipment
Salamander Synergy Equipment Stand
I would measure both subs with the mains and the crossover in play, as your mains may help some in the 70-90Hz area.

The peak at 30Hz could be tamed with the PEQ filters in the subs... and the 20Hz peak probably won't be an issue... probably needed on movies hitting that low area. Then you could run Audyssey and smooth the rest out okay.
 

gpershall

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Aug 11, 2018
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I would measure both subs with the mains and the crossover in play, as your mains may help some in the 70-90Hz area.

The peak at 30Hz could be tamed with the PEQ filters in the subs... and the 20Hz peak probably won't be an issue... probably needed on movies hitting that low area. Then you could run Audyssey and smooth the rest out okay.
Thanks for the suggestions. Will give this a try later today. Should the dips at 70hz be addressed?
 

Sonnie

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Staff member
Joined
Apr 2, 2017
Messages
4,400
Location
Alabama
My AV System  
Preamp, Processor or Receiver
Monolith HTP-1 Processor (Movies and Surround)
Main Amp
Sanders Sound System Magtech (Dual Amps)
Additional Amp
Emotiva XPA-Eleven
Computer Audio
Intel NUC w/ Roon ROCK
DAC
miniDSP SHD (Two-Channel Music Only)
Universal / Blu-ray / CD Player
Panasonic UB9000 4K UHD Player (for media discs)
Front Speakers
MartinLogan Renaissance ESL 15A
Center Channel Speaker
MartinLogan Focus C-18
Surround Speakers
MartinLogan EFX Surrounds
Surround Back Speakers
MartinLogan ElectroMotion ESL
Front Height Speakers
MartinLogan EM-IC
Rear Height Speakers
MartinLogan EM-IC
Subwoofers
SVS SB16-Ultra x4 (music) + PB16-Ultra x2 (movies)
Other Speakers or Equipment
VTI Amp Stands for the Magtechs
Video Display Device
JVC DLA-NX9
Screen
Elite 128" Screen
Remote Control
Universal MX-890
Streaming Equipment
Roku Ultra
Streaming Subscriptions
Lifetime Roon Subscription
Tidal
qobuz
Netflix
Amazon Prime
Satellite System
Dish Joey 4K
Other Equipment
Salamander Synergy Equipment Stand
If possible... I would use 1/6th octave smoothing... as some of those dips/peaks are narrow and probably not noticeable.

Having the mains mixed in with the measurements may resolve that issue.
 

dsnyder0cnn

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Nov 28, 2017
Messages
48
That's a beautiful room. A lot of space to pressurize, but a pair of SB13s with the SB4000 amps should do the job nicely.

Like @Sonnie said, if you use 1/6th octave smoothing or psychoacoustic smoothing, you'll get a better sense of what areas need addressing. You may find that moving your listening position a foot forward or back helps significantly with some of those dips, so it's worth taking the time to experiment. i agree that a little PEQ (in the SVS app) can be helpful to soften the peaks a bit, but it's okay to have about 1 dB per octave gain as you move down in frequency; flat is not the goal.

I'd definitely like to see plots with just the subs, just the mains, and then everything together.
 
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