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Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Diy digital crossover
Diy digital crossover
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Old 2nd November 2011, 11:13 PM   #1
hugostensson is offline hugostensson  Sweden
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Default Diy digital crossover

Hello every one!

I'm new to this forum, so i hope I can get answer to my questions.

I planning to build a new loudspeaker, and then I got the idea of building a digital crossover instead of an active.

So I have made som research on google, but I have not found any valuable for me.

I'm very new to the digital processing side, so I wounder if anyone has any tips of, Where to start?

Which chip to use?

How to implement code and stuff?

so myy goal is:
2 way monitor with a basic digital crossover.


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Old 3rd November 2011, 02:30 AM   #2
audio reini is offline audio reini  Austria
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I started with the same intention 4 weeks ago. And sorry, I didnt found any other way then to buy a dsp equipment. I'm affraid, its because of my english knowledge level. However, I've bought the motu ultra lite mk3 hybrid for about 650,-. The crossoversoftware is included. Hybrid means you may use firewire or usb. I use the usb. There is a digital line in and additional line in's. I use the digital line in from a dvd and an additional line in for the measurementsignal. There are 8 line out channels. I use them all. 4 channels for the speakers (2-way stereo), 1 for sub. And two for alternative chassis, in my case another tweeter (with higher crossover frequency, other filter characteristic and lower spl). So I am able to compare different tweeters with quick settings. The 8th channel I use for a 2nd sub with a detonation sub amp. With the line out channels I go to a 7.1 surround amplifier with direct line in for the speaker signals. Thats nice, because I dont need any additional amp. If the settings are done, it is not necessary to have the laptop online, you can switch it off and you dont need it to hear music, until you want to change anything in your designed system.
If you find another way, I'm interested in.

Good luck
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Old 3rd November 2011, 03:15 AM   #3
KenTripp is offline KenTripp  Australia
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Old 3rd November 2011, 03:34 AM   #4
_henry_ is offline _henry_  Australia
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minidsp certainly first come to mind.

i was affraid their fix 48khz sampling will affect the sound, but it turns out, they are pleasant to use and flexible enough to adjust for 2 way or mixed passive 2way with bass augmentation/sub

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Old 3rd November 2011, 03:34 AM   #5
abraxalito is offline abraxalito  United Kingdom
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This depends on how DIY you want to be. If you want to get 'down and dirty' then I'd recommend ARM Cortex M4 as a starting point. This CPU architecture is available from STM and Freescale at the moment, shortly to be introduced by TI and NXP too.

But if you want just a basic 2-way XO then the simplest and cheapest solution would be to start out with LPC1313 (a Cortex M3, subset of M4 instructions) - the newer revision has two SSP ports which can be coded to become 16bit I2S outputs. To get data in you can use the GPIOs. Even this very simple chip has more than enough horsepower for a few IIR biquads or even shortish FIRs.

Free and open ARM Cortex M3 and Cortex M0 embedded development tools
'The total potential here must be nothing less than astronomical.'
'Nothing less. The number 10 raised almost literally to the power of infinity.'
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Old 3rd November 2011, 08:52 AM   #6
hugostensson is offline hugostensson  Sweden
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My goal is to build a two way active monitor with a digital crossover.

I'm fairly new to digital, so the LPC1313 is a development platform, which I can implement code to the processor, or do I get it wrong?

So then after I have implemented the code to the processor I can put the processor on a pcb and connect the audio input/output?

Tell if I get it totaly wrong.
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Old 3rd November 2011, 07:49 PM   #7
riverwarrior is offline riverwarrior  United States
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Location: Santa Barbara, CA
I use foobar2000 with a digital crossover plugin (foo dsp xover). This setup is free, fast and cheap and doesn't require any programming or soldering.
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Old 3rd November 2011, 08:23 PM   #8
qusp is offline qusp  Australia
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Location: Brisbane, Australia
i see no need for specialised hardware with todays processor speeds i5, i7 etc
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Old 3rd November 2011, 08:30 PM   #9
hugostensson is offline hugostensson  Sweden
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Join Date: Nov 2011
My goal with this project is also, to mabye, make the loudspeaker for it self, so I can take it with me.

So it would be nice to have everything in the box, so you just can connect to the loudspeaker and then the digital crossover would be in the loudspeaker enclosure.

Does anyone know, how I could make it that way?
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Old 3rd November 2011, 09:15 PM   #10
boris81 is offline boris81  United States
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Location: white plains, ny
I've been looking for cheap programmable DSP audio hardware modules too. For your purpose it will be hard to find anything that beats miniDSP.

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I think for the moment there's no competition.
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