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Old 5th December 2010, 03:21 PM   #71
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Thank you sdnyc.

There was a small problem with EQ at 42 hz.
It is solved,and i will try it now.

Bernt "båndsei"
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Old 6th December 2010, 01:26 AM   #72
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Quote:
Originally Posted by minidsp View Post
Hello,

Following the question of Dave, we're also interested to hear how you're reaching higher levels of THD when using the attenuation.. It just doesn't line up to our measurements on the miniDSP and technically I'm not sure how I could explain it. (though doesn't mean it doesn't exist as we certainly don't pretend speaking the truth... :-)


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Well, I initially raised the issue and even soldered pots on the output stage as I was really convinced that is the case.

However since then I used the digital attenuation and could hear no degradation even to -18db.

I guess I was "hearing things". Today I run the MiniDSP as it is with no analogue pots.
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Old 6th December 2010, 03:15 AM   #73
sdsnyc is offline sdsnyc  United States
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Quote:
Originally Posted by båndsei View Post
Thank you sdnyc.

There was a small problem with EQ at 42 hz.
It is solved,and i will try it now.

Bernt "båndsei"
Bernt,

Can you elaborate on the issue at 42 Hz? I didn't notice anything strange at or around that frequency.

Let us know how it sounds when you have a chance to try it.
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Old 27th July 2011, 07:53 AM   #74
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Default DSP using DCX2496

A Japanese builder had done the Digital implementation for Orion transfer function using DCX2496. Should be a breeze to convert to MiniDSP? The issue with MiniDSP's HF notch filter inconsistency may be minimal (or may even be fixed already).

Orion DSP (3.2)


Click the image to open in full size.


Key frequencies according to DCX2496:

Tweeter
The next high-pass Linkwitz-Riley4 (LR 24) 1.44KHz

Midrange Subsequently
The following low pass Linkwitz-Riley4 (LR 24) 1.44KHz
The next high-pass Linkwitz-Riley4 (LR 24) 92Hz

Woofer Finally

The following low pass Linkwitz-Riley4 (LR 24) 92Hz

EQ

89Hz-high pass shelving filter set to 172Hz (58) 5/6/11 ORION Revision 3.3
Designation of the ASP circuit is 89Hz-SHP was of 172Hz, set f1 = 88Hz results in a measurement by ARTA.
1.Gain-6dB, f1 = 88Hz, Slope 6dB/oct, Type Low Shelving

1450Hz-low-pass shelving filter set to 2123Hz (54) 7/26/10 ORION Revision 3.2
1.Gain-3.3dB, f1 = 2.11kHz, Slope 6dB/oct, Type High Shelving


Midrange equalization.

High-pass characteristic may be determined by the width of -6dB/oct baffle dipole characteristics first. To compensate for the lack of it because the bass. Then crush the dipole characteristic peaks. To handle all of the units also as a characteristic peak near 5KHz.

20Hz-161Hz low-pass filter set to shelving
1.Gain-3dB, f1 = 161Hz, Slope 6dB/oct, Type High Shelving
2.Gain 15dB, f2 = 20Hz, Slope 6dB/oct, Type Low Shelving

478Hz-parametric equalizer gain of 10dB Q = 1.6

4.77kHz-parametric equalizer gain of 20dB Q = 2.8
(4.77kHz-in can not be set once and 20dB-8.9dB Q = 2.8-stacked in two stages 11.1dB Q = 1)


Woofer equalization.
Dipole dipole equalization characteristics, the two drivers to set the equalization optimization Qts.

Set the low pass filter 20Hz-shelving of 286Hz (dipole equalization)
1. Gain-8.3dB, f2 = 284Hz, Slope 6dB/oct, Type High Shelving
2. Gain 15dB, f1 = 20Hz, Slope 6dB/oct, Type Low Shelving

Set the low pass filter 20Hz-shelving of 110Hz (equalizing driver)
1. Gain-15dB, f2 = 109Hz, Slope 6dB/oct, Type High Shelving


I don't know why M-T xo is 92hz. I thougt Orion is 120hz ?
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Old 27th July 2011, 12:45 PM   #75
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The Orion+ 3.3 revisions included lowering the W-M xo to 92Hz based on SL's experience with Orion 4 using that W-M xo frequency.
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Old 27th July 2011, 12:49 PM   #76
Davey is offline Davey  United States
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Creating a proper transfer function for past or present Orion iterations with a DCX2496 (or similar) is not difficult (although some folks have screwed it up.) I first did this back in 2005.

The potential problems are not in creating the transfer function.......they're possible signal/noise issues, voltage levels/clipping, dynamic range, volume control placement, etc, etc.

This is old news in any case.

Cheers,

Dave.
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Old 27th July 2011, 06:20 PM   #77
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Yes but I thought it was not possible because of the boost limitation of DSP especially on the woofer part? It's very interesting how he used high-shelf attenuation along with usual SLP.
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Last edited by gainphile; 27th July 2011 at 06:27 PM.
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Old 9th October 2011, 01:28 AM   #78
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Do you think a DEQX would work on the Plutos?
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Old 29th October 2011, 05:00 PM   #79
NYCOne is offline NYCOne  United States
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Quote:
Originally Posted by Davey View Post
Creating a proper transfer function for past or present Orion iterations with a DCX2496 (or similar) is not difficult (although some folks have screwed it up.) I first did this back in 2005.

The potential problems are not in creating the transfer function.......they're possible signal/noise issues, voltage levels/clipping, dynamic range, volume control placement, etc, etc.

This is old news in any case.

Cheers,

Dave.
I guess the real question is whether someone has actually run the Orion with the MiniDSP. There's lots of reasons something might not work, but until it's tried, you don't know for sure.

I suspect the MiniDSP would work well.
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Old 29th October 2011, 05:59 PM   #80
Davey is offline Davey  United States
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Sorry that I didn't make that clear in my posting. Of course I've tried it.

I'm aware of a number of folks who've done it. In PM conversations I got the impression a few of them did it correctly and a few of them didn't. They are not close to me geographically so I couldn't audition any of those systems first hand.

Your suspicion is perfectly valid. Why not try it and judge for yourself?

Cheers,

Dave.
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