What just happened?

opusarlo

opusarlo

Active Member
I just played Widor's 6th and Saint Seans 3rd in their entirety. I was so impressed with the bass headroom, I decided to see how much headroom was there. I loaded up "BassI love you" and started playing it. It was great at first - I had turned the volume waaaay down. Then, about 20 seconds into the song there was a bass note that was supposed to hit, but his just came out as "pffft"...not at all a bass note. The very next bass note was perfect, and I feel I could have played the rest of the song, but I was worried about my gear. It made me think the subs were out of phase - it was that kind of sound...like the subs were fighting. The subs are in phase, so what could this be? I have listened to this particular recording numerous times without hearing the same thing - it is not in the recording.
20180907_172554.jpg
 
you might be standing/sitting in a null point. run a test track or better yet that test sound portion and
move 6 inches forward and back in increasing cumulative moves.

maybe it's your amp and the first bass whack drained the PS. try left side only eg pull
right channel preamp output to power amp, this should preserve the power for the left side.
(based on my recall of percussion (big drums0 on the left side of orchestra). make sure
everything in the sound chain is in phase.

and if you're computer nutz like me, capture on audacity. repeated play that two drum whack
section until you figure it out.

COOL - your subwoofers are mounted in a door with a cabinet capacity of a room? oo-rah.
 
I recently bought the Stereophile "Editor's Choice Sampler And Test CD," and it revealed a phasing issue that I'd never noticed before. Once I corrected that (by simply reversing the leads on my loudspeakers), I began to hear what I'd been missing in my system.

My speakers are home build and my amps were recently serviced. Now that I know there is a phasing issue, I will have to begin the process of finding exactly where the issue is - did I make a mistake in wiring my woofers or the crossovers? Did the service tech reverse a speaker lead in the amplifiers? Did I mis-mark one of my cables? I'll find out, but were it not for the test CD, I would have never noticed it.

GeeDeeEmm
 
Both channel speakers? That affects absolute acoustic polarity as well as phasing to a sub, two different things re crossover cancellation.
 
I feel it is something far more simple than the solutions offered...I have not yet complete my electricity overhaul and was running everything on the same 15 amp service. Just the Behringer can draw 20 amps at full volume, McIntosh amps can draw 13 amps, and likely a few more amps for the other gear involved. I believe I was starving the system, and it simply did not have the steam to reproduce that note at the volume I was requesting.
 
Last edited:
gdmoore28 said:
I recently bought the Stereophile "Editor's Choice Sampler And Test CD," and it revealed a phasing issue that I'd never noticed before. Once I corrected that (by simply reversing the leads on my loudspeakers), I began to hear what I'd been missing in my system.

My speakers are home build and my amps were recently serviced. Now that I know there is a phasing issue, I will have to begin the process of finding exactly where the issue is - did I make a mistake in wiring my woofers or the crossovers? Did the service tech reverse a speaker lead in the amplifiers? Did I mis-mark one of my cables? I'll find out, but were it not for the test CD, I would have never noticed it.

GeeDeeEmm
Click to expand...
I will look for this CD and order it straight way. Fantastic idea, Thanks.
 
Opusarlo,

1. You have two subs; what is the distance between them? (There would have been a different 'cancellation' if the frequencies of the notes differed.)

2. You were possibly standing in the same spot when the two bass notes were played - were you?

Further to that, as said above. You mentioned the volume was way down; might one then accept that the power supply was not drained (overloaded)? Being bass, the two notes would have been almost in phase.

Failing that, I am also waiting for the explanation. As advised, is it possible to play the music on a different system?
 
Audiovet said:
Opusarlo,

1. You have two subs; what is the distance between them? (There would have been a different 'cancellation' if the frequencies of the notes differed.)

2. You were possibly standing in the same spot when the two bass notes were played - were you?

Further to that, as said above. You mentioned the volume was way down; might one then accept that the power supply was not drained (overloaded)? Being bass, the two notes would have been almost in phase.

Failing that, I am also waiting for the explanation. As advised, is it possible to play the music on a different system?
Click to expand...
I have no other system to play the tune one, however, I have played the same YouTube video on dozens of systems so I know that note is not normally so deflated. I know I turned down the Behringer, but I did that because the bass is so much more extreme. I think that even though I turned it down, the bass of that note was too much for the system to reproduce with the power supply it had - 15 amps.
 
opusarlo said:
I just played Widor's 6th and Saint Seans 3rd in their entirety. I was so impressed with the bass headroom, I decided to see how much headroom was there. I loaded up "BassI love you" and started playing it. It was great at first - I had turned the volume waaaay down. Then, about 20 seconds into the song there was a bass note that was supposed to hit, but his just came out as "pffft"...not at all a bass note. The very next bass note was perfect, and I feel I could have played the rest of the song, but I was worried about my gear. It made me think the subs were out of phase - it was that kind of sound...like the subs were fighting. The subs are in phase, so what could this be? I have listened to this particular recording numerous times without hearing the same thing - it is not in the recording.
View attachment 1287046
Click to expand...
Are those in wall subs they look like they in a door or a big box?
What build type are they .
Did you try it with subs off? Floorstanders On full range .
My subwoofer is more for movies so some songs sound off, too much Xmax. Or too much bass.
That’s odd no bass ? Note low volume,....:confused:
 
before you rewire your house for 3 phase 440V service or string a separate line
to the distribution transformer, try putting an inline wattmeter on your system.
you may not be drawing 1x amps on two circuits, either separately or individually.

easier explanations for bass whacks - again to rule out bass amp power
supply needing viagra, record loop of bass whacks on audacity and play
repeatedly.

then if it's your bass amp, add a couple of joules worth of capacitance.
the Dynaco 400 back in the day, had an add-on to do this exact same
feature. note they added relays to prevent damage.
 
BillWojo said:
You blew the walls of your closet out.

BillWojo
Click to expand...
c042.gif
 
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