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Old 29th September 2010, 01:48 PM   #21
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Default First MiniDSP project

I've decided on my first project with MiniDSP. It's a 4-way open baffle loudspeakers, with 3-way panel and a dipole bass array.

htguide.com/forum/showthread.php4?t=36626

Waiting for the boards to arrive

Click the image to open in full size.
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Old 30th September 2010, 03:30 AM   #22
minidsp is offline minidsp  Hong Kong
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Neat... we're looking forward to the pics of your design.
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Old 2nd October 2010, 08:37 AM   #23
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Thank you for the fast shipment! The boards arrived and I quickly got it up and running.

I replicated the analog xo's transfer function of my current dipoles within 15 minutes or so. Mind you it's quite a complex one similar to SL's ASP. With a laptop it's all too easy!

Click the image to open in full size.

I tried many recordings last night to "find" any faults with the sound quality.... nothing!... there was simply no distortions nor coloration comparing to analog xo. It is either equal or better.

Thanks for such a great product to cater us DIYers. I will post my progress and findings.
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Old 2nd October 2010, 10:53 AM   #24
minidsp is offline minidsp  Hong Kong
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We're certainly glad to hear you're happy with your miniDSP system..

FYI, if you ever try to implement the cascaded filters, have a look at the new app note we added to the website here. Online calculators to follow shortly...

Have fun with your new system,
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Old 2nd October 2010, 08:36 PM   #25
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A calc would be great!

I am doing one myself at the moment for learning. Let's say I want to put two High pass filters for a tweeter, one at 300hz and one at 2.1kHz, both 2nd order (Q=0.5?), I come up with these values:

biquad1,
b0=0.0187723817731764,
b1=0.0375447635463527,
b2=0.0187723817731764,
a1=-1.92491047290729,
a2=0.728559550134926,
biquad2,
b0=0.981227618226824,
b1=-1.96245523645365,
b2=0.981227618226824,
a1=-1.92491047290729,
a2=0.728559550134926

But when I entered this into MiniDSP it expects the rest of the biquads (biquad3 to biquad8 as per example in the software). What values should I put for those?
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Last edited by gainphile; 2nd October 2010 at 08:45 PM.
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Old 3rd October 2010, 10:09 AM   #26
knuisje is offline knuisje  Netherlands
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Your values are not right for the desired HPF's. Have a look at my spreadsheet at this post.
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Old 3rd October 2010, 11:51 PM   #27
Davey is online now Davey  United States
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Gainphile,

Paste this to your advanced window in one of the crossover filters: (I didn't try it, but I believe it should work for you.)

knuisje,

Nice spreadsheet!

Cheers,

Dave.



biquad1,
b0=0.961852371238129,
b1=-1.923704742476260,
b2=0.961852371238129,
a1=1.922962903190660,
a2=-0.924446581761860,
biquad2,
b0=0.771744849183422,
b1=-1.543489698366840,
b2=0.771744849183422,
a1=1.513960384941010,
a2=-0.573019011792680,
biquad3,
b0=1,
b1=0,
b2=0,
a1=0,
a2=0,
biquad4,
b0=1,
b1=0,
b2=0,
a1=0,
a2=0,
biquad5,
b0=1,
b1=0,
b2=0,
a1=0,
a2=0,
biquad6,
b0=1,
b1=0,
b2=0,
a1=0,
a2=0,
biquad7,
b0=1,
b1=0,
b2=0,
a1=0,
a2=0,
biquad8,
b0=1,
b1=0,
b2=0,
a1=0,
a2=0,

Last edited by Davey; 3rd October 2010 at 11:58 PM.
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Old 4th October 2010, 04:58 AM   #28
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Thanks Davey... I'll try it as soon as I'm home.

Knuisje.. Thanks for your GREAT speadsheet !
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Old 6th October 2010, 06:47 PM   #29
CCU is offline CCU  Denmark
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Just going to tack along here
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Old 15th October 2010, 12:05 PM   #30
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Default Let's start ...

Davey, thank you very much that string works . Now we have the recipe to implement circuit as complex and well-engineered as Orion ASP. In this case I have also found an easier way to do it.

The Circuit in question:

Click the image to open in full size.

As discussed previously only MiniDSP has the capabilities to implement something like this compared to other products like DCX2496 as highlighted.

Slopes (obviously) ... ok
Phase alignment/allpass filters ... ok
Notch filters ... ok
Channel level ... ok
Shelving Lowpass filter ... ok
Master volume control ... ok
Cascaded filter stage topology ... ok
Linkwitz Transform ... ok (thanks to the netherlands DIYers!)


Here, one would need:
2x MiniDSP kit $200
1x Advanced 4-way crossover $10
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Last edited by gainphile; 15th October 2010 at 12:09 PM.
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