XTZ 1x12 occasional noise. Is this a failure? - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 16 Old 09-15-2018, 04:12 PM - Thread Starter
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XTZ 1x12 occasional noise. Is this a failure?

I have xtz 1x12 since one month ago.

In some scenes of movies with strong bass, the sub makes a little noise. It sounds like "POK" more or less.



It sounds one "POK" and nothing more. It is not continuous. If you hear the scene going down the volume of the bass, it doesn´t sound that noise.

Is this a failure? Or is it simply a mechanic noise of the driver in its maximum extension?

The new model 12.17 EDGE has DSP and the amp has the total control of the woofer. But the 1x12 no. May be is the cause, I don´t know. What is your opinion?

Last edited by subwoofer40; 09-20-2018 at 12:49 PM.
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post #2 of 16 Old 09-15-2018, 04:19 PM
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Without a video,,,, cant be 100% sure but it sounds like the driver is been pushed beyond its mechanical limit probably in very low frequency moments.
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post #3 of 16 Old 09-15-2018, 06:31 PM
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I have no clue what a "glock" noise sounds like. I have pushed my 1X12 to the point where it will make port noise, but I've never heard any type of mechanical noise or anything like that.

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post #4 of 16 Old 09-15-2018, 07:13 PM
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"glock" sounds like you may be bottoming out the woofer


..and yes , a video showing it would help
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post #5 of 16 Old 09-20-2018, 12:45 PM - Thread Starter
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post #6 of 16 Old 09-20-2018, 01:40 PM
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Quote:
Originally Posted by subwoofer40 View Post
The video is here.

The noise is in the second 7.

What is that?

http://www.youtube.com/watch?v=f8ijz6XpydQ&feature=youtu.be

Sounds like clipping. What do you have the sub level set to on your receiver? Where do you have the gain set on the sub? Did you run your receiver auto-calibration set up? Do you have anything like dynamic EQ, dynamic volume, boosts enabled.


This sounds very reminiscent of how the Rythmik LV12R I had performed during this same Underworld Awakening scene. I was only running the LV12R a few dB's hot over Audyssey calibration, however. No dynamic EQ, volume or any other enhancements. Video clip> https://sendvid.com/oh6u05z5

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post #7 of 16 Old 09-20-2018, 01:53 PM - Thread Starter
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Gain sub is 2 oclock in that video,and AVR level +6. With +4 the noise is the same (with autocalibration the Level is 0). But I normally set the volume louder.
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post #8 of 16 Old 09-20-2018, 02:24 PM
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Both video samples sound like the same issue to me. I dont know if the video's are minimizing the appearance of driver excursion, but it doesn't look like there is enough to cause that noise. Almost sounds like some form of mechanical friction.

Also your settings seem very aggressive. If your over driving the sub,those settings would explain this, you should try different sub placement and recalibrate until your post calibration has your trim well into the (-).

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post #9 of 16 Old 09-20-2018, 02:43 PM
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Quote:
Originally Posted by subwoofer40 View Post
Gain sub is 2 oclock in that video,and AVR level +6. With +4 the noise is the same (with autocalibration the Level is 0). But I normally set the volume louder.

What brand receiver are you using? Running the sub level in the + region in the receiver settings is highly discouraged. Depends on the receiver, but you want to run the auto-calibration so that the result is somewhere in the -6 to -9 region. From there you can bump it up if you want more output, but you don't want to go past 0 into the + numbers. Also, disable any audio "enhancers" like dynamic EQ.
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post #10 of 16 Old 09-20-2018, 06:31 PM
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Quote:
Originally Posted by subwoofer40 View Post
Gain sub is 2 oclock in that video,and AVR level +6. With +4 the noise is the same (with autocalibration the Level is 0). But I normally set the volume louder.
Sub gain at 2 o'clock and it came back with a sub trim of 0dB? how large is your room?
Agreed with MMI, it's best not to run the AVR sub trim into the positives as you will almost certainly be clipping the signal in a movie like Underworld:Awakening

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post #11 of 16 Old 09-21-2018, 06:09 AM
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Quote:
Originally Posted by jamiebosco View Post
"glock" sounds like you may be bottoming out the woofer


..and yes , a video showing it would help

Also positive, this is what that sound description is.

subwoofer40

Like many said in the previous posts, running your sub level on the AVR, in the minus would help, just need to raise the gain on the sub itself to achieve that.
Also, if you have the DEQ engage, turn it Off, it can play havoc when playing at level under reference (since The DEQ will try to bring the bass to reference level), reference is very loud. Even with my two PB13-Ultra, once engage, there was way too much bass, I now have it Off, and sound much better, even during those very low frequencies and loud moment.


Ray

Last edited by darthray; 09-21-2018 at 06:15 AM.
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post #12 of 16 Old 09-24-2018, 05:54 AM - Thread Starter
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What brand receiver are you using? Running the sub level in the + region in the receiver settings is highly discouraged. Depends on the receiver, but you want to run the auto-calibration so that the result is somewhere in the -6 to -9 region. From there you can bump it up if you want more output, but you don't want to go past 0 into the + numbers. Also, disable any audio "enhancers" like dynamic EQ.
Quote:
Sub gain at 2 o'clock and it came back with a sub trim of 0dB? how large is your room?
The brand receiver is Yamaha rxv465. That AVR hasn´t dynamic EQ.

My room is 13 m2. Little-medium.



Bass level in sub is almost three oclock. In the scene of video, the level of receiver was +4db. (With autocalibration the level is 0 db, right in the middle).

If I would want negative numbers with autocalibration, I had to set the bass level louder.


I think it´ll be the woofer bottoming out. The coil hitting in the back plate, I don´t know. But with PB1000 and Polk dsw550, I hadn´t that problem. And I set the same volume.

Last edited by subwoofer40; 09-24-2018 at 08:23 AM.
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post #13 of 16 Old 09-24-2018, 08:48 AM
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Quote:
Originally Posted by subwoofer40 View Post
The video is here.

The noise is in the second 7.

What is that?

http://www.youtube.com/watch?v=f8ijz6XpydQ&feature=youtu.be
What movie is that from?
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post #14 of 16 Old 09-24-2018, 12:51 PM
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Quote:
Originally Posted by subwoofer40 View Post
The brand receiver is Yamaha rxv465. That AVR hasn´t dynamic EQ.

My room is 13 m2. Little-medium.



Bass level in sub is almost three oclock. In the scene of video, the level of receiver was +4db. (With autocalibration the level is 0 db, right in the middle).

If I would want negative numbers with autocalibration, I had to set the bass level louder.


I think it´ll be the woofer bottoming out. The coil hitting in the back plate, I don´t know. But with PB1000 and Polk dsw550, I hadn´t that problem. And I set the same volume.
Turn your gain to 4 o’clock, put your trim level at ~-5dB

Then go under

Options -> Subwoofer/Bass -> Subwoofer trim -> +6dB
Options -> Subwoofer/Bass -> Extra Bass -> OFF
Options -> Tone control -> Bass -> +3-6dB


This should stop the clipping and also bring your bass levels up.

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post #15 of 16 Old 09-25-2018, 08:51 AM - Thread Starter
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Turn your gain to 4 o’clock, put your trim level at ~-5dB

Nothing. That method doesn´t work.

For example, Resident Evil 5. Alice and the ship. Minute 1:42.

With bass almost 3 oclock and AVR LEVEL +6, noise "pok". (with autocalibration was 0 dB). When I set +4, the noise dissapears.

I try your method.

I turn the gain 4 oclock (Autocalibration is -4dB here)

So I turn up 6 db in the AVR, because I want the same volume. I put +2 in the AVR level.

The noise is the same. If I turn down, the noise dissapears.
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post #16 of 16 Old 10-04-2018, 12:13 AM
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