Subwoofer out of phase on Dave Matthews Band Central Park DVD ?
05-22-04, 08:18 AM
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Subwoofer out of phase on Dave Matthews Band Central Park DVD ?
RE: Dave Matthews Band: The Central Park Concert
I've loved this DVD for the content, but it has always sounded muddy to me (I have a decent HT system: Front L&R speakers: Infinity RS-5 / Center: Infinity CC-3 / Surrounds L&R: Infinity QPS-1 / Back Surrounds L&R: Dual LU50PW / Sub: Kenwood: 1050SW / Receiver: Sony STR-DE995 / DVD: Sony DVP-NS300B). Whereas all my other DVDs sound great (regardless of sound format).
Recently I cranked the volume while watching the Central Park DVD and noted a thumping distortion from the sub. I reversed the phase on the sub, and voila---beautiful crisp sound, full, deep bass response, and no distortion.
You're probably wondering why I didn't post this in the HT forum...
I'd like to see if others have this same issue with the Central Park disc. Also, I was under the impression that when you got the phase right for your system, it was always right as long as you didn't change anything (i.e. location of speakers, etc.). Reversing the phase of the sub in any other situation results in poor sound. So the problem is only with this disc. (I've also used a HT setup disc to make sure my phase was correct).
Does anyone else have to reverse the phase for a particular DVD?
I've loved this DVD for the content, but it has always sounded muddy to me (I have a decent HT system: Front L&R speakers: Infinity RS-5 / Center: Infinity CC-3 / Surrounds L&R: Infinity QPS-1 / Back Surrounds L&R: Dual LU50PW / Sub: Kenwood: 1050SW / Receiver: Sony STR-DE995 / DVD: Sony DVP-NS300B). Whereas all my other DVDs sound great (regardless of sound format).
Recently I cranked the volume while watching the Central Park DVD and noted a thumping distortion from the sub. I reversed the phase on the sub, and voila---beautiful crisp sound, full, deep bass response, and no distortion.
You're probably wondering why I didn't post this in the HT forum...
I'd like to see if others have this same issue with the Central Park disc. Also, I was under the impression that when you got the phase right for your system, it was always right as long as you didn't change anything (i.e. location of speakers, etc.). Reversing the phase of the sub in any other situation results in poor sound. So the problem is only with this disc. (I've also used a HT setup disc to make sure my phase was correct).
Does anyone else have to reverse the phase for a particular DVD?
05-22-04, 01:39 PM
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I wouldn't know how to do it if I did. My 5.1 system is just a mini-shelf system and the wires are the only thing that I have control over. I've never had to touch anything. Although my left sub has some sort of a problem. At certain frequencies it makes a flutter sound. Usually occurs during certain loud explosions, but not all. Depends on the frequency of the sound. I can get really good low continuous frequencies, but a sudden "pop" will make the speaker flutter. It may be the mounting itself. The screws may be lose and the sound may be vibration against the casing.
05-22-04, 11:10 PM
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Having never heard this DVD i'm not sure how intense the bass is, but did a lookup on your sub the 1050sw and see that its a 150 watt RMS sub that is capable of reaching 200hz to 20hz according to manufactors specs.
A few questions
What is your crossover set to on your receiver for your sub. THX specs recommend 80hz, which is a good place to start.
Have you used a professional dvd like Avia and a Sound Pressure Meter to accurately calibrate your sub to your main speakers?
Avia has a nice subwoofer sweep that goes from 100hz to 20hz, interesting to see how well your sub handles the lower hz ranges.
150 watts RMS isn't an exceptional amount of power and by cranking your receiver you may have reached your sub limit. Again, I have not heard this dvd and not sure how intense the bass is, but lower frequency bass is harder to reproduce then upper frequency, most lower priced subs will choke once they start going below 30hz.
Recommend to calibrate your subs level to your mains using Avia (or similiar) with a sound pressure meter and trying crossover of 80hz. Do not use any sort of bass boost or bass management on your receiver, then try playing the dvd again.
A few questions
What is your crossover set to on your receiver for your sub. THX specs recommend 80hz, which is a good place to start.
Have you used a professional dvd like Avia and a Sound Pressure Meter to accurately calibrate your sub to your main speakers?
Avia has a nice subwoofer sweep that goes from 100hz to 20hz, interesting to see how well your sub handles the lower hz ranges.
150 watts RMS isn't an exceptional amount of power and by cranking your receiver you may have reached your sub limit. Again, I have not heard this dvd and not sure how intense the bass is, but lower frequency bass is harder to reproduce then upper frequency, most lower priced subs will choke once they start going below 30hz.
Recommend to calibrate your subs level to your mains using Avia (or similiar) with a sound pressure meter and trying crossover of 80hz. Do not use any sort of bass boost or bass management on your receiver, then try playing the dvd again.
05-22-04, 11:26 PM
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thanks for the replies...
Again, the DVD sounds fine (even when cranked) after reversing the phase. So there is no need to recalibrate, etc, since this is the only DVD on which the distortion occurs (which, I'll say again, is completely resolved with reversing the phase on the sub). All other DVDs sound fine without reversing the phase. Therefore it can be concluded that the phenomenon is isolated to the disc and not the sub. The question is:
"I'd like to see if others have this same issue with the Central Park disc."
Again, the DVD sounds fine (even when cranked) after reversing the phase. So there is no need to recalibrate, etc, since this is the only DVD on which the distortion occurs (which, I'll say again, is completely resolved with reversing the phase on the sub). All other DVDs sound fine without reversing the phase. Therefore it can be concluded that the phenomenon is isolated to the disc and not the sub. The question is:
"I'd like to see if others have this same issue with the Central Park disc."
05-22-04, 11:50 PM
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Does your DVD sound muddy the whole time or only when your cranking it (before reversing the phase)? I seriously doubt that a music DVD would be released with subwoofer problems, but then again Jurrasic Park DTS was a disaster as well.
Try sending an email to the studio who released the dvd and ask them.
Try sending an email to the studio who released the dvd and ask them.
05-23-04, 02:22 AM
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Originally posted by Mike Lowrey
I wouldn't know how to do it if I did. My 5.1 system is just a mini-shelf system and the wires are the only thing that I have control over. I've never had to touch anything. Although my left sub has some sort of a problem. At certain frequencies it makes a flutter sound. Usually occurs during certain loud explosions, but not all. Depends on the frequency of the sound. I can get really good low continuous frequencies, but a sudden "pop" will make the speaker flutter. It may be the mounting itself. The screws may be lose and the sound may be vibration against the casing.
I wouldn't know how to do it if I did. My 5.1 system is just a mini-shelf system and the wires are the only thing that I have control over. I've never had to touch anything. Although my left sub has some sort of a problem. At certain frequencies it makes a flutter sound. Usually occurs during certain loud explosions, but not all. Depends on the frequency of the sound. I can get really good low continuous frequencies, but a sudden "pop" will make the speaker flutter. It may be the mounting itself. The screws may be lose and the sound may be vibration against the casing.
05-23-04, 06:16 AM
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Originally posted by Shroud
Does your DVD sound muddy the whole time or only when your cranking it (before reversing the phase)?
Does your DVD sound muddy the whole time or only when your cranking it (before reversing the phase)?
I really wish someone with the disk would try listening to it and try reversing the phase to see if sound is improved.
