Xilica 4080 - Page 7 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #61 of 94 Old 06-09-17, 01:04 PM
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Re: Xilica 4080

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post #62 of 94 Old 06-09-17, 02:20 PM Thread Starter
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Re: Xilica 4080

John,
Here are the Left and Right Channels with the subs delay of 5ms and the xover at 100 hz.
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post #63 of 94 Old 06-09-17, 04:00 PM
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Re: Xilica 4080

Okay. That worked out much better.
We need to reduce the SWs delay by 3ms for this new 100 Hz XO setting to achieve the best phase tracking.

With that new setting the following SPL is predicted:

First the left channel. Comparing the alignment of the data from Post-59 (50 Hz) to Post-62 (100 Hz). Note that the SPL support from 55-90 Hz is much better with the 100Hz XO. This is due to the SWs being placed better in the room to avoid that room effect.
Xilica 4080-left-spl-62-vs-59.jpg

Now the right channel. We see the same impact.
Xilica 4080-right-spl-62-vs-59.jpg

The 100 Hz XO will be easier to EQ and result in better bass quality. I would not expect the any downside to this change.

Below is the mdat comparison:
ja Post 62 Vs Post 59 SPL Result.mdat
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post #64 of 94 Old 06-10-17, 01:55 PM Thread Starter
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Re: Xilica 4080

John,
These are the latest measurements left right with subs and eq according to REW. Let me know if you want to see the subs by themselves. I am going to listen like this for now and see how it sounds, so far it sounds really good.
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post #65 of 94 Old 06-10-17, 02:46 PM
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Re: Xilica 4080

I'm glad we found a good starting point - one you can enjoy.

> The timing/phase looks good just a predicted. That work was very successful.
> The EQ improved in the flatness in the low bass.
> There is a significant broad increase in SPL from 100-400 Hz. Post-62 data, showed a minorbut more modest. If you added any EQ in that range you may want to check to see if you inadvertently added boost instead cut filters in that range.

The only remaining work is listen and adjust house curve/EQ to determine what sounds best to you given your setup and program material.
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post #66 of 94 Old 06-11-17, 01:16 PM Thread Starter
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Re: Xilica 4080

Hey John,
After looking at the two measurements I see the increase in SPL as you pointed out, funny REW eq called for that boost. so I am going to cut it in half and see where it lands. If you notice in the right chaneel in 59 the REW eq didn't ask for any boost at the same frequency strange...
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post #67 of 94 Old 06-11-17, 05:28 PM
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Re: Xilica 4080

It's strange that REW would boost a rise further. Possibly the settings chosen lead to that situation. If you want me to take a look, post your mdat file that shows the REW calculated filters that you applied.
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post #68 of 94 Old 06-11-17, 06:16 PM Thread Starter
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Re: Xilica 4080

John,
It was pretty much the same you and I covered when you were showing me how to use the eq function. I have lowered the boost on that filter by half, I will make a measurement in the next couple days hard to do when the wife is home the high frequency's hurt her ears. Then if need be I will post the mdat file of the eq for you to have a look. I played with it some and as you said each time the calculation changes ever so slightly, I just found it strange that it called for the boost on the left channel but not the right???
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post #69 of 94 Old 06-16-17, 10:22 AM Thread Starter
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Re: Xilica 4080

John,
Changing the mic position from up to forward made a big difference, so this is where I am now with the new mic position.
This was using REW's EQ. Sounds pretty good!!!
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post #70 of 94 Old 06-16-17, 12:58 PM
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Re: Xilica 4080

That looks much better.
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