Measurement with Bass missing

pirlouit669

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Joined
Feb 13, 2023
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Preamp, Processor or Receiver
ONKYO NR-3009
Universal / Blu-ray / CD Player
OPPO BDP 103
Front Speakers
GKF SVP 1000
Center Channel Speaker
GKF SVP 1000
Surround Speakers
GKF SVP 100
Subwoofers
SVS PB-3000
Screen
DIY
Remote Control
iRULE
Other Equipment
JBMEDIA Light Manager
Hi there,
First of all : congrats on that amazing software !

After spending hours trying to solve a problem, I finally decided to ask for help.
My setup : dedicated home theater with 5.1 system (well, formerly 7.1 but with 2 speakers in maintenance) : 3 front, 2 surround, 1 sub (SVS PB 3000 brand new :kiss:). Everething driven by an Onkyo NR 3009.
For measurement I use my laptop & UMIK-1 (with 90 deg cal file), connected by HDMI to my receiver.
I also spent a LOT of time reading forums and watching Youtube tutorials.

After a few (JAVA) measures everything worked fine :

Response_ok.jpg



And a few days later, it was impossible to get a response from the sub during a measurement.
Maybe I changed something, but I really can't say what. I've been tweeking my systems ever since I got the mike.
I went through everything I could think of...

First I thought it may come from my receiver settings.
  • Of course my speakers are set to small / Crossover 80Hz.
  • Everything like Audyssey or other funky systems disabled.
  • I tried all listening mode and configs I could to try getting sub noise during that sweep : no chance.
  • I also triple-checked every physical connection.

Then I thought the pb might come from my laptop :
  • I downloaded FlexAsio and sent sub cal pink noise to the sub with REW Generator, it worked fine ! (low freq are correctly directed to the sub)
  • I saved the sweep from REW and sent it from my computer or my BR player, it also worked.
  • In case I had changed REW config by error, I downloaded it to another laptop and tried again that REW sweep : bad luck.

I checked input / output info during REW sweep (JAVA) : INPUT: 7.1PCM OUTPUT:5.1. => NO SUB
Same input / output when I use FlexAsio on the sub : INPUT: 7.1PCM OUTPUT:5.1. => SUB OK.
Then I guess problem does not come from the INPUT format.

I read that REW sends analog input (with JAVA) (which somehow is in contradiction with the info above).
Therefore I tried to read a 2-channel input from Youtube, but sub worked... (INPUT:pCM 2.0ch OUTPUT:Theater Dim 3.1ch). Same for another source : INPUT:Analog OUTPUT:Theater Dim 3.1ch, sub worked.

I just can't figure how to make that sweep measurement work with my brand new sub :dontknow:

If you guys have any idea, that would be GREAT.

Thanks in advance and take care,
Pirlouit.
 

John Mulcahy

REW Author
Joined
Apr 3, 2017
Messages
7,212
To access individual channels of a multi-channel output on Windows you need to either use an ASIO driver (such as FlexASIO as you mentioned) or the WASAPI exclusive entry for the output device if using the Java drivers (names starting EXCL). In either of those cases you can send signals directly to the LFE channel.
 

pirlouit669

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Thread Starter
Joined
Feb 13, 2023
Messages
3
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Preamp, Processor or Receiver
ONKYO NR-3009
Universal / Blu-ray / CD Player
OPPO BDP 103
Front Speakers
GKF SVP 1000
Center Channel Speaker
GKF SVP 1000
Surround Speakers
GKF SVP 100
Subwoofers
SVS PB-3000
Screen
DIY
Remote Control
iRULE
Other Equipment
JBMEDIA Light Manager
Hi John !
Thanks for your answer.
I already managed to send signals directly to the LFE (with FlexAsio).
My problem is that the signal from a "standard" Java Room Measurement does not trigger anything in my sub.

However it seems that I may have a workaround in using REW in playback mode. (even if that does not explain why the sweep from REW doesnt go the the SUB in the first place).
 

achugh

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Jan 16, 2023
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Preamp, Processor or Receiver
Pioneer Elite SC-37
Universal / Blu-ray / CD Player
Panasonic BP-UB9000P1K
Front Speakers
Klipsch RF7 II
Center Channel Speaker
Klipsch RC64 II
Surround Speakers
Klipsch RB81 II
Surround Back Speakers
KlipschRB81 II
Subwoofers
Tweak City Audio CS18.2 (Dual Subs)
Video Display Device
LG OLED77G2PUA
Other Equipment
miniDSP 2x4HD, UMIK-1
@pirlouit669 What version of REW are you using? When using JAVA drivers with my laptop HDMI connected to my AVR (Pioneer Elite SC-37) and opening Windows SOUND settings from the Control Panel, I can play all 7.1 channels when I test my speakers. However, when I play tones using REW Measurement menu, I can only play 5.1 channels. BL and BR do not play any sound for me too.

I am however able to play sound in a subwoofer using LFE channel. I did notice that if myAVR is in STEREO mode, I will not hear any LFE sound unless I force my AVR to send low frequencies to the subwoofer. For me, I have my subwoofer set to PLUS instead of YES in my speaker setup. Or I can use my sound mode to one of the DOLBY modes and then I get sound in LFE channel. I believe you need to check your AVR sound mode as more than likely that is where your issue lies.

JAVA drivers send PCM sound and depending on the AVR sound settings you may or may not hear anything from your LFE channel.
 

pirlouit669

Registered
Thread Starter
Joined
Feb 13, 2023
Messages
3
More  
Preamp, Processor or Receiver
ONKYO NR-3009
Universal / Blu-ray / CD Player
OPPO BDP 103
Front Speakers
GKF SVP 1000
Center Channel Speaker
GKF SVP 1000
Surround Speakers
GKF SVP 100
Subwoofers
SVS PB-3000
Screen
DIY
Remote Control
iRULE
Other Equipment
JBMEDIA Light Manager
Hi achugh,
I'm using REW 5.20.13.
I think you're right : issue lies in my AVR. I must admit I'm not completely comfortable with all the listening modes.
I'll dig deeper.
Thanks for your answer !
 
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