DSP active crossover with FDA tri amping

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mixMZ

Member
Joined 2013
#1
Has anyone tried complete digital solution like that?

Just wondering if that actually possible at low costs:

if im correct nanodigi ,motu 8a or OpenDRC-DA8 could do all dsp routing ,crossover and equalization

then 3 cheap digital amplifiers such alientek d8 ,fx audio 802, smsl ad18 or even newest fx audio D2160 used for tri amping

digital input -> nanodigi -> (3x digital output) -> 3 x FDA for active 3 way

or something not fully digital but with 8 dacs + class d (sure amps)

digital input -> motu 8a -> 3 x (stereo class d amps)
digital input -> OpenDRC-DA8 -> 3 x (stereo class d amps)

Can anyone advise what would be the best way to control tracked volume on that configuration for all 3 amps?


Thanks
 
#2
I did with a nano digi then with three Soekris DAC.
Is very good, I using this since one year ago. you can change the slope of the filters until 48dB. Can change the phase, invert it. It has four kind of filters in each of the eight outputs and six changes in each with parametric equalization. Also I have hacked the output to I2S for coupling directly to the Soekris DAC. Is cheap and reliable.
 
#3
dady said:
I did with a nano digi then with three Soekris DAC.
Is very good, I using this since one year ago. you can change the slope of the filters until 48dB. Can change the phase, invert it. It has four kind of filters in each of the eight outputs and six changes in each with parametric equalization. Also I have hacked the output to I2S for coupling directly to the Soekris DAC. Is cheap and reliable.
Click to expand...
Do you have more info about your build?
I'm looking to make something very similar.
 
#4
Hi mixMZ,
It worked for me with a nanoDigi followed by two FDA DDX320 from hifimediy.com (tweaked).
Hi-medium and bass-medium, stereo. Subwoofer digital output from nanoDigi to a regular DAC.
Highly flexible, and good, very dynamic sound.
But having heard about limitations of power DACs compared to DACs followed by anamplifiers, tried it to verify. That new setup it not yet fully optimizedp, but I find it already superior.
Alain
 
#5
alain_online said:
Hi mixMZ,
It worked for me with a nanoDigi followed by two FDA DDX320 from hifimediy.com (tweaked).
Hi-medium and bass-medium, stereo. Subwoofer digital output from nanoDigi to a regular DAC.
Highly flexible, and good, very dynamic sound.
But having heard about limitations of power DACs compared to DACs followed by anamplifiers, tried it to verify. That new setup it not yet fully optimizedp, but I find it already superior.
Alain
Click to expand...

Thanks alain_online


Never heard DDX320 so hard to say how it sounds. I only had alientek d8, then upgraded to smsl ad18 and then moved to wadia power dac 151 which sounded best to my taste also was most detailed out of 3.

But i only heard those amps with 3 way passive speakers so really though that going with active solution + 3 amps would gain quite a lot in SQ.

What dac / amp you using now when comparing sq to nanodigi+ fda`s?
 
#7
dady said:
I did with a nano digi then with three Soekris DAC.
Is very good, I using this since one year ago. you can change the slope of the filters until 48dB. Can change the phase, invert it. It has four kind of filters in each of the eight outputs and six changes in each with parametric equalization. Also I have hacked the output to I2S for coupling directly to the Soekris DAC. Is cheap and reliable.
Click to expand...

which Soekris Dac's were you using? DAM 1021 or DAM 1121? I am asking because I already have one DAM 1021.
 
#8
I know this is a necro post, but the Motu 8a seems completely capable of that. You would probably need to do the crossover processing on the host with something like CamillaDSP, but the routing, gain, DAC and FX are handled on the 8a effectively turning it into a very powerful preamp. Also its user interface is available from any web client (phone, ipad, desktop). It has presets so you can configure the entire thing, save and forget to select audio from your digital streamer inputs or any of 8 analog inputs. If you need DSD you'll have to let your streamer do the conversion on the fly. You can even take the analog stereo input you select, route it to the computer, have it do crossover processing and send it back to the Motu for DAC output.

Also for headphone geeks you can sum the crossed-over channels together in a separate aux / monitor mix (with any custom headphone EQ). From there you can send the headphone mix to the dedicated headphone outputs or the remaining two analog outputs without affecting the outputs to the main speakers.

In other words, you get your 8 channels of high quality DAC at $100/channel and a 48 channel professional DSP mixing console for free with USB3, Thunderbolt and audio over ethernet (AVB).

I'm seriously considering using this setup along with a RasberryPI 4b / Moode audio streaming box.
 
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