No bass roll off on my measurement??

Marzen

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Why do my summed and not summed sub measurements look like this? There is no roll off at all? Thanks strange response curve.PNG
 

John Mulcahy

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Need the mdat file to check the measurements look valid, but could also post images of the Impulse graph for each sub with a time span of at least 1 second.

There is a very wide SPL span on that graph, you can adjust the span using the Limits button at the top right of the graph - probably want 40 dB at the bottom and 100 dB at the top.
 

Marzen

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Joined
Apr 1, 2019
Messages
14
More  
Preamp, Processor or Receiver
Denon 4300x
Main Amp
Parasound a21+
Additional Amp
Emotiva
DAC
Blusound Node 2i
Front Speakers
Magnepan 1.7i
Center Channel Speaker
Airmotiv C1+
Surround Speakers
Polk Audio RC85i in-wall
Surround Back Speakers
Polk Audio RC85i in-wall
Front Height Speakers
Polk Audio RC80i 2-Way In-Ceiling
Rear Height Speakers
Polk Audio RC80i 2-Way In-Ceiling
Subwoofers
Dayton Audio RSS315HF-4 12" Reference Series
Video Display Device
LG Cinebeam HU810PW
Screen
Silver Ticket 120in
Streaming Equipment
Nvidia Shield 2017
Other Equipment
Butt Kickers
Need the mdat file to check the measurements look valid, but could also post images of the Impulse graph for each sub with a time span of at least 1 second.

There is a very wide SPL span on that graph, you can adjust the span using the Limits button at the top right of the graph - probably want 40 dB at the bottom and 100 dB at the top.

Thanks, here's a saved mdat file containing the left, right, and summed measurements. https://drive.google.com/file/d/1WT1BI3bctJ6NlEivWNsozGEMlL0hGnaf/view?usp=sharing
 

John Mulcahy

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Measurements look fine. They were made without a timing reference though, so it isn't meaningful to add them (or at least adding them is unlikely to show the response as it would be at the measurement position). There is roll off at the low end eventually, below the cal file correction (which stops at 10 Hz).

51247
 

Marzen

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Joined
Apr 1, 2019
Messages
14
More  
Preamp, Processor or Receiver
Denon 4300x
Main Amp
Parasound a21+
Additional Amp
Emotiva
DAC
Blusound Node 2i
Front Speakers
Magnepan 1.7i
Center Channel Speaker
Airmotiv C1+
Surround Speakers
Polk Audio RC85i in-wall
Surround Back Speakers
Polk Audio RC85i in-wall
Front Height Speakers
Polk Audio RC80i 2-Way In-Ceiling
Rear Height Speakers
Polk Audio RC80i 2-Way In-Ceiling
Subwoofers
Dayton Audio RSS315HF-4 12" Reference Series
Video Display Device
LG Cinebeam HU810PW
Screen
Silver Ticket 120in
Streaming Equipment
Nvidia Shield 2017
Other Equipment
Butt Kickers
Understood, I found a quick guide for enabling a timing reference using the umik-1 here, I'll incorporate that today. Thanks for the tip.
 
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