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Hi-end DSP based multi-channel integrated Preamp/Crossover/DAC project

This box looks very interesting indeed. One question about the DSP functionality: Is it possible to load filters generated from room correction software such as Acourate, Audiolense or Dirac?

You can load FIR filter tap coefficients from a file so I don't see why not.

Depends how many taps you need of course because that resource is not unlimited.

cheers
 
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$2.5k is high diy territory

For that kind of money i could buy a Lynx Hilo, how does it compare?



I don't think that they are comparable.


A Hilo is a converter interface (A/D and D/A). It looks as thought it would still require some DSP engine to implement a crossover network plus some expansion cards to get eight channels of analog output. The bare bones unit is about USD 2700.00.


The device here has a phono stage plus two other analog inputs (balanced and unbalanced) plus digital inputs for about 2-2.5k USD. It has sufficient DSP horsepower to form a complex crossover network for a pair of 4-way speakers.


I am very seriously considering one. It seems like a cool piece of kit and would solve numerous problems for me.
 
$2.5k is high diy territory

For that kind of money i could buy a Lynx Hilo, how does it compare?
That's a strange comparison. Lynx Hilo is 2 channel AD/DA converter. Analogue-Precison has 8 channels and functions as a crossover filter including advanced FIR filters.

The Lynx Aurora 8 doesn't have the same functionality either. The only one in the pro industry that comes close is Metric Halo, but it doesn't have FIR filter, nor a display or remote capabilities. Sure, these pro units have other functionalities of course as they are meant for studios.
Metric Halo ULN-8 - Thomann UK

DEQX HDP-4 or HDP-5 is a product that you could compare it with to some degree. But I'm quite certain the Analogue-Precison holds higher quality in terms of lower distortion, besides offering two extra channels, a proper display and greater software flexibility.
HDP-4 – DEQX

I would say the price of the Analogue-Precision is very competitive.
 
Can two Ultimate Preamps be linked if one wanted to crossover 5-8 channels?

If you mean stereo 5 to 8 way then it is possible to link two boards to get a total of 16 channels but the base unit we currently offer only has 8 channels. But we are working on providing an extra two channels via one of the S/PDIF outputs using an external DAC. Typically this would be used to power a pair of subwoofers to make up a stereo 5 way system.

regards
David
 
Ok, I'm sold
But why is it so important the crossover is handled in the DAC. I plan to use acurate's fliters/ software before it reaches the DAC.
Is'nt this feature something I will eventually won't use or need? Please info me? thanks

The crossover is implemented in the DSP not the DAC. Even if you feed two channel audio from a PC that does some DSP functionality you still need an external crossover if you are going to implement multi-way active speakers.

cheers
 
and finally I put DSP in use
I'm still trying to figure out audio weaver
for start I used tree way template from analog precision web page and change slope from 4 order to 2 order LR.

What I would like to know, if I chose 2 order LR, do I need to reverse polarity on one driver manually or is it made automatically via software ?
If I have to make it manuall is it done like on the picture ?

thanks
 

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@yoke what drivers have you used? Is the bass sealed or vented?
Hi, I'm using;
scan speak 2904/7000 - Aleph mini
scan speak 18W8545 (closed) - AlephX (around 60W - 8 mosfet per amp)
scan speak 2 X 21W8555 (closed around 46L - stuffed with sonofil) - right now amplifier is LJM L30D (D class) until I finish CFA amplifier from dadod

source is rPi 2 (music from NAS) connected via usb to David's DSP
 
Hi, I'm using;
scan speak 2904/7000 - Aleph mini
scan speak 18W8545 (closed) - AlephX (around 60W - 8 mosfet per amp)
scan speak 2 X 21W8555 (closed around 46L - stuffed with sonofil) - right now amplifier is LJM L30D (D class) until I finish CFA amplifier from dadod

source is rPi 2 (music from NAS) connected via usb to David's DSP
That will sound pretty sweet when its all dialed in. Nice work.