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post #4471 of 4482 Old Today, 01:22 PM
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Quote:
Originally Posted by derrickdj1 View Post
I calibrate differently, the low end peak is at 105 after calibration
this is less than reference IMV

reference should be anchored on the mid range which then allows for the individual to rolloff the HF and heat up the LF to taste (as most target curves are shaped in this way). This is how MK calibrates by the sounds of it & it's how I do it (though sounds like his target curve is stronger than mine on the low end). Having said that I'm not that dogmatic about reference anyway, I just turn it up til it sounds about right (I don't have an on screen display for MV which probably influences that )

This does make comparing VS data (at ref or -10 or whatever) difficult though as they won't be comparable. I think we've said before that VS data should be accompanied by FR though so we can at least get some idea of the delta (in FR).
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post #4472 of 4482 Old Today, 01:55 PM
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Yes, I calibrate for the midrange to hit 85 dB with a -20 dB sweep(usually -10 dB signal and -10 dB level in REW. I cross at 120hz. When I say flat the 80-300hz is level and let my subs natural boost down low do its thing. When I changed from sealed to ported it basically raised my response from 5-30hz and why they are different. This is why I can play flat because the low end is the same Spl that was as my sealed boosted 10-12 dB.
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post #4473 of 4482 Old Today, 02:06 PM - Thread Starter
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Quote:
Originally Posted by 3ll3d00d View Post
where do you cross these to your mains?

unfortunately comparing this data is not possible (IMV that is) as the source content is strong above 50Hz (hence is aliased into the output) & the underlying FR of the 2 systems is so different.
There should be no aliasing 25hz and below since the VS working range goes to 50hz. For example, 60hz would have aliasing at 30hz, 52hz would have it at 26hz, but since 50hz is in range, 25hz and below should not have any.
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post #4474 of 4482 Old Today, 02:32 PM
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Quote:
Originally Posted by dominguez1 View Post
There should be no aliasing 25hz and below since the VS working range goes to 50hz. For example, 60hz would have aliasing at 30hz, 52hz would have it at 26hz, but since 50hz is in range, 25hz and below should not have any.
That isn't how aliasing works. If the sample rate is 100Hz then Nyquist is 50Hz so 60Hz content appears as 40Hz, 70 as 30, 80 as 20, 90 as 10, 100 as DC, 110 as 10 and so on. These are referred to as Nyquist zones so even zones are mirror images of odd ones.
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post #4475 of 4482 Old Today, 03:00 PM - Thread Starter
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Quote:
Originally Posted by 3ll3d00d View Post
That isn't how aliasing works. If the sample rate is 100Hz then Nyquist is 50Hz so 60Hz content appears as 40Hz, 70 as 30, 80 as 20, 90 as 10, 100 as DC, 110 as 10 and so on. These are referred to as Nyquist zones so even zones are mirror images of odd ones.
Ah, thank you sir. Didn't know that.
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post #4476 of 4482 Old Today, 04:13 PM
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Just so there is no confusion, here is a representative FR with main volume at 0 post calibration. From here I bring up the low end. Omnimic give this graph in the spl section 100 db. There are differences between Omninimic and the Pioneer auto EQ. From here I will set 3 or 4 more presets using PEQ, LS 12 and HS 12 filters for an aggressive house curve. This should not be far from reference except for frequencies above 60 Hz. This keeps the Ref FR that MCACC has set for the most part. I will then boost at 20 Hz and cut in the mid 30 hz region for the house curve. I don't do any EQ above the XO.

I do think coolrda is correct that FR should accompany the other day. We all do things a little different and the auto EQ programs like MCACC or Auddysee set different reference curves base on other thing done in the background such as standing wave correction.
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post #4477 of 4482 Old Today, 05:31 PM - Thread Starter
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Quote:
Originally Posted by 3ll3d00d View Post
unfortunately comparing this data is not possible (IMV that is) as the source content is strong above 50Hz (hence is aliased into the output) & the underlying FR of the 2 systems is so different.
Wait...there's above 50hz content on the EOT scene? I thought it only went to 30hz or so?
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post #4478 of 4482 Old Today, 06:39 PM
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Quote:
Originally Posted by MKtheater View Post
I will post my data again. VS, response, and spectrum.


IB Response(low end about 5 dB hot compared to crossover)





IB VS data of EoT running reference and subs 10 dB hot at crossover





IB spectrum of a low extending scene





Now here is the same data running the SLLT flat at crossover.








Thanks man. These graphs prove my point. There is a corresponding increase in SPL. He level matched the xover to 85db which shows on both FR's and there about as close as can be expected. But the huge gain in TR@10hz is because of equally huge spl gain@10hz of 12db. The IB comes in at 88db and the SLLT at 100db. Nothing out of the ordinary with the SLLT. It's highly efficient. It produces 4x the power. With enough headroom you can match this response. But why would you especially with huge cabs already in place only needed ports. Regardless of the max SPL of his IB thd SLLT will make 12db more SPL. His graphs prove the gains in TR are because of the gains in SPL.

Last edited by coolrda; Today at 06:43 PM.
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post #4479 of 4482 Old Today, 06:53 PM
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Quote:
Originally Posted by 3ll3d00d View Post
That isn't how aliasing works. If the sample rate is 100Hz then Nyquist is 50Hz so 60Hz content appears as 40Hz, 70 as 30, 80 as 20, 90 as 10, 100 as DC, 110 as 10 and so on. These are referred to as Nyquist zones so even zones are mirror images of odd ones.
Interesting. But would this nullify our 30-10 drop being those are near ref level and anything else is much lower?
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post #4480 of 4482 Old Today, 07:17 PM - Thread Starter
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Mk, what freq did you calibrate? Avr pink noise?

Can you show your full response?
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post #4481 of 4482 Old Today, 07:20 PM
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Yes but that response graph was not with the IB at 10-12 dB hot which would equal the Spl. They both were measured flat and then when I watched a movie I bumped the LFE up on the IB and when I watched a movie with the SLLT I never bumped it because it feel more without it. My seats are what causes any irregularities in the response as the mic is close to them and I don't have any cal files under 10hz for the Umik. I had 3II3d00d create some for spec lab and why it digs deeper as it should. It is a generic file so there will be some errors but enough to get an idea. The VS confirms my shaking at ULF as well.
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post #4482 of 4482 Old Today, 07:31 PM
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I say stick with EOT for th VS data. Add the FR data from our choice of platform, Omnimic or REW. I'm will use use OM because thats want I have and know. I don't see a problem with that as long as we use the same source or if we use different, that we have tried it cross platform and post the results. How about this, the current Simulated Card, underneath that the new Actual card under that FR graph and under that VS graph. You can add a top down or mockup drawings or notes under that.
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