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

Showing 12 responses by mizike

Thanks for your input, greatly appreciated. I am running two subs, seams like more is the next step.
They do have continuously variable phase controls. I;m not sure what to try there, I guess trial and error. I have spent the last hour or so just moving them around randomly and re-testing. I have gotten audible base in the 40hz range but it is still down 13db from the 30hz tone. So do I have a peak or a null? I have 90db at 30hz and 89 at 20. The 30 hz tone is clearly audible the 20 not so much but I can feel it well. Back down to play with the phase control and see what that does. I'll be back up later to see if there are any more suggestions. And thanks to everyone who has tried to help, I really appreciate it, Allen. (AKA Mizike)
I have just went through the entire range of phase adjustment, moving the nob three clicks at a time and playing test tones up to 60hz. Above 60 nothing really changes no matter what I do.I have made the mode better but it is still there, down 8/9db from 30hs and 5/6db from 50hz. (i have some loss of volume at 50hz as well, although not nearly as much) I do notice a definite gain if I move my head and/or meter forward and down towards the floor. Maybe I should just get a much shorter chair. Or consider building a platform for one or both subs. 
ricred1, are you talking about main speaker placement or sub placement? I am thinking you mean the main speakers need to be closer to the back wall.
I do have them set up symmetrically I will try that first. I was thinking the swarm is the way to go. Just not sure how to implement more subs with long cable runs. Is 30' of single ended cable on a sub a bad thing? Random is better, this is what I am getting mostly. 
I have audible base to below 30 hz, just none at 40. My room is long and narrow, equipment is set up on narrow wall. 14' x 38'. I will try moving the subs around some. I do not have real long cables so that may be a problem. I was reluctant to get super long cables. I always thought the shorter the better with single ended cabling. 
I am testing with the subs playing, and yes I have good audible bass to about 25hz, just nothing with the 40hz tone playing.
I do not have enough cable to place subs at my listening chair. My room is very long at 38' only 14' wide. I bought a pair DL Labs sub cables here on the Gon at 12' each, also hampered by outlet locations. 
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.
Ok, time for an update. First off I spent some time moving the two subs I had around. I finally got some bass output at 40hz but it was 12-13 db down from the rest of the band. I ordered some Y cables from Blue Jean and they came today. I have a big ass HSU 15" sub for HT use that I moved to the far end of my long room. I put it in the corner, 4" from the side wall and 10" from the back wall facing into the back wall.(by back wall I mean behind my chair 24', very long room). Holly smokes Batman, who would have thought that it would be so absolutely awesome. I don't know why it works but it dang sure does. I have full artriculate base output from 20hz up through 60hz. I have all the crossovers set @ 55hz. The volume went WAY down on the two Rythmik subs the HSU matches them at approximately 1/3 volume. It's so good I can't believe a forth subs will make it better.(I'm getting one anyway just to be sure) I forgot to say one "front" sub I placed on a extra heavy duty steel & wood table 34" off the floor straight behind the left speaker facing into the left corner about 2.5 feet out. Could not be any happier with the results.Thanks again to everyone that gave tips and tricks and real advise, sincerely, Allen.
Yes sir, I actually know why it works, I was being a wee bit facetious, thanks for you thoughts.(Giddy with delight)
A little bit of an update, I added a fourth sub to the room. I now have very audible bass from approximately 26 hz up. The fourth sub was not as big a jump as going from two to three but it is an improvement. I now a a slight peak at 40 hz instead of no sound at all but overall the results are vastly better than what I had before. Thanks, to all who chimed in with actual advise, Allen (Mizike).