Xilica 4080 - Page 6 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #51 of 94 Old 06-03-17, 03:07 PM Thread Starter
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Re: Xilica 4080

John,
Here are the adjustments made to only the gains.
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post #52 of 94 Old 06-03-17, 07:32 PM
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Re: Xilica 4080

What happened?
The 2 channels are opposite polarity of each other now. The polarities were correct in Post-48. Did you change one of the channels?

That's a very big sag/dip from 50-80 Hz. EQ will not be able to help with that. You may want to consider moving the LP position forward or backward to see if it can be improved.
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post #53 of 94 Old 06-04-17, 11:14 AM Thread Starter
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Re: Xilica 4080

John,
Here are the first measurements from today, my notes are attached in the note section. The green trace is the left channel with all drivers in the inverted position. The red trace is the right channel all drivers in the inverted position, the blue trace is the right channel all drivers in the positive position.

As for the sound, the phantom center sound is present when all drivers from both channels are in the inverted position, when I put all the drivers from the right channel in the positive position I loose the phantom center channel sound.
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post #54 of 94 Old 06-04-17, 01:11 PM
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Re: Xilica 4080

Jay the good news is that the charts confirm your impression of the phantom center. The channels are in phase when the left channel is negative and the right channel is positive. Below are impulse and phase charts:
Xilica 4080-ir.jpg

Xilica 4080-phase.jpg

The bad news is that there is a settings or wiring issue that is causing all the confusion.

Does the 4080 allow you invert the input channels? If so, one of the 2 inputs may be inverted by mistake. Maybe there is a channel mixing page that has wrong settings. I would look at the 4080 first since that is the new element in your system and I assume you did not previously have this problem.
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post #55 of 94 Old 06-04-17, 01:28 PM Thread Starter
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Re: Xilica 4080

John,
Yes the 4080 allows for changes in polarity on the input side. I thought of that too and checked this what I found, all of the polarity's on the input side are set to positive +...
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post #56 of 94 Old 06-05-17, 10:46 AM Thread Starter
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Re: Xilica 4080

John,
I can't tell you how much I appreciate your help, specially getting this wiring problem fixed!!! I was able to grab a new set of cables today for in the future... Looking forward to our next session maybe Friday or Saturday before I can get back to it.
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post #57 of 94 Old 06-08-17, 07:34 PM Thread Starter
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Re: Xilica 4080

Hey John,
So I have the new cables and adapter and I am ready to continue, what is the first thing you want me to check?
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post #58 of 94 Old 06-09-17, 09:19 AM
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Re: Xilica 4080

I suggest...

With:
> Mic at LP
> Loopback timing active
> All 6 of the 2040 outputs set to Negative.

Measure:
> Left channel alone
> Right channel alone
> SWs alone

That will confirm the polarity of the 2 channels now measures correctly with the new cabling and also allow us to determine the best polarity and delay timing for the SWs.
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post #59 of 94 Old 06-09-17, 11:07 AM Thread Starter
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Re: Xilica 4080

Ok John,
Here are the measurements you requested, all the drivers are in the negative position. Left and Right and then the Left and Right subs.
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post #60 of 94 Old 06-09-17, 01:01 PM
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Re: Xilica 4080

Okay. The phase chart of left and right channels now show the correct phase polarity (per the common convention) and the same phase rotation as it should. If the phantom center is present when you listen this way then finally we have the measurements agreeing with the stage imaging.

With these settings the best timing for the SWs is obtained with the current SW polarity and an increase of the SW delay of 5 ms. [An alternate very good setting is obtained by inverting the current SW polarity and using the current SW delay setting.]

Both of this options still result is a pretty big sag in the response 50-120 Hz. EQ can help smooth this out, but I suggest you also shift the SW-mains XO point from 50 Hz to 100 Hz so see if that significantly improves the result. To do that, just make the same series of 3 measurements with the XO freq changed to 100 Hz.

Below are the results of the from the current 50 Hz XO setting showing the overall responses with the current SW polarity and +5 ms SW delay.
SPL with SWs:
Xilica 4080-spl.jpg

Phase with SWs:
Xilica 4080-phase.jpg

Phase Tracking through the 50 Hz XO range:
Xilica 4080-phase-tracking.jpg
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