2. tech-talk
  3. 160115-75180

Total bass suck out at 40hz

So I'm a little slow, but it occured to me today to see if there were test tones recordings on Tidal of Qobuz. Yes there are. I have a radio shack SPL meter so I went to work playing them to see what I had in my room. I was shocked to find a total lack of audible bass at 40hz. At first I thought they must have made an error in the recording. Then I went to a different set of test tones and wow same thing. I never dreamed something like that would take place. I have read a lot of discussions about bass peaks and nulls and always thought it would just be slightly less in volume at the null, not completely gone. So Am I imagining this and if not what do I do to remedy it. I am apparently missing a lot of music and never knew it. I am currently listening to my freshly refinished Yamaha NS 1000m speakers(just put them in the system Wednesday after work) with a Modwright KWI 200 integrated amp and a Lumin streamer/dac. I also have stereo Rythmik  F12 subs. Thanks, Allen.
mizike
mizike OP
107 posts
 
Yes mijostyn, I have come to that conclusion as well. I do think I will build a platform for one of them just to try that and see what it does. I can tell a definite volume gain while playing test tone by just leaning forward and down so I tend to agree with your thoughts on moving closer. A little more like near field listening.
gs5556
1,218 posts
 
Is the test tone playing at 40hz or is it a dead track? Try another speaker.

If the file is good, then check to see if your woofer is moving at 40 hz. 
This is why I always measure frequency decades one foot from each speaker before I measure at the listening position.
gtagg
11 posts
 
Wow lots of really good stuff.
before you ran your test did you notice anything wrong. I believe its
a null in your speaker crossovers.
or room acoustics, your speaker cables play a big part in your system as well. I doubt your speakers will reach 20hz nor would you hear it. But you should feel it, 
Even if you move them around you’ll lose some else. Do you use a line conditioner? Do you use an equalizer ?Many factors come into play, Put all your test equipment away, and use the best test equipment there is, your ears. Enjoy your music! GT
alien tweek audio



audiorusty
268 posts
 
The only frequency response chart I could find for the NS-1000M inexplicably stopped at 200 Hz, but according to that chart the NS-1000M starts to roll off at approximately 630 Hz with 200 Hz being approximately 6db lower. According to Hifi News test figures 53 Hz is another 6db down from 200 Hz which leads me to believe that 40 Hz is rolled off even further.

The selected setting on the F12's low pass filter should be either, the 3 or 6db down point of that filter so when combined with the natural rolloff point of the main speaker makes a kind of quasi crossover.

It might be worth a try setting the low pass filter at say 80 Hz and then adjusting it back to see if there is any improvement in your 40 Hz output.  
Post removed 
More to discover