Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!! - Page 20 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #191 of 446 Old 05-17-12, 10:54 PM
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Re: Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!!

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Gregr wrote: View Post
Brandon nice job answering all of the questions these past couple of days. I really thought it would be easier than this, I mean get solved quicker. You know when you find the issue (and I believe your close) we are all gonna say what took so long.

Anyway Robert, Sub-Crazy you guys are covering it all. Great job.

I was just thinking, don't get frustrated but..., you've got the sub plugged into the pre-low level sub-out right? So when you say you turn the volume up on the Sony receiver your actually going to the on screen menu and under sub your turning down the balance.

I just had to ask that

But I want to say this..., any time you have a signal under the control of 2 TWO analog volume control knobs you can run into exactly the type of issue you have and then I take it you are using an analog EQ with rheostat/potentiometers you are increasing that potential many fold.

I'm just going to assume each volume control is a variable resistor your stacking resistance in a circuit when ideally you should have very little added resistance in this circuit. Then there is the Question of a Zobel circuit. Anytime there is

People spend lots of money on "volume controls) a Burr Brown Rheostat can sell for $50 to $100 and some go up from there. Any way get a digital EQ if you have to that will end any resistance question. Bu the Zobel network or Hi Pass Filter.

Brandon you could have a hi pass filter in your sony or in the Crown but you need it in the box. The problem is active inductance caused by the driver/speaker movement..

Island, Robert sub-crazy is your hi-pass filter/crossover in the speaker box? Does it contain a Zobel network (probably).

Just some thoughts, don't quote me, I am not there I have no real idea what is there. is there a resister and a cap attached to the speaker in its network..., I have never seen an LMS Driver exceot at Parts express

Hey call Parts Express (especially if you bought there) if you have question about a zobel network for the speaker.....

But I think get the EQ out of the loop is a start.
My high pass filter is set at 14 hz and it is accomplished through a MIC2200.
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post #192 of 446 Old 05-17-12, 10:55 PM
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Re: Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!!

I am trying to figure out why a high pass filter on a sealed LMS.
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post #193 of 446 Old 05-17-12, 11:16 PM
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Re: Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!!

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I am trying to figure out why a high pass filter on a sealed LMS.
He doesn't need a HPF is he is not boosting the low end. If I remember correctly the Anti-mode has a lift 25hz mode which boosts the low end but also adds a 10hz hpf which I think is appropriate when using a single sealed LMS. If using multiples then no HPF is needed but I have seen the carnage of a single LMS Ultra sealed with a lot of power and no HPF, not pretty.
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post #194 of 446 Old 05-17-12, 11:28 PM
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Re: Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!!

I am just wondering because I have seen an LMS running full steam in a sealed box and It did not bottom or make any crazy noises. That thing was really cooking and doing way more movement than mine have ever done. The surround was actually wrinkling when the cone was at full excursion. I can't believe he could bottom that woofer in a sealed box with the amp running on a shared 20 amp circuit. I think the noise was the result of a clipped signal and not bottoming in any way.
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post #195 of 446 Old 05-17-12, 11:32 PM
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Re: Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!!

Island, don't wanna miss a chance to comment..., your hitting all the bases too. I gotta say when things go bad at HTS people jump in with both feet alot of good ideas get looked at.

We believe everything we tell ourselves..., don't we??
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post #196 of 446 Old 05-17-12, 11:58 PM
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Re: Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!!

This LMS Ultra isn't mine but I still have nightmares to this day

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post #197 of 446 Old 05-17-12, 11:59 PM
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Re: Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!!

what kind of setup did that
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post #198 of 446 Old 05-18-12, 12:00 AM
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Re: Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!!

Your still one of the kings with your build Robert, I bow to you
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post #199 of 446 Old 05-18-12, 12:02 AM
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Re: Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!!

Thanks!
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post #200 of 446 Old 05-18-12, 12:02 AM
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Re: Sealed TC Sounds LMS Ultra 5400 18" NOOB STYLE!!

If I remember correctly is was a 6cuft sealed enclosure with a QSC PL 9.0 set to a higher gain that normal.
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