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Old 2nd January 2013, 01:44 PM   #361
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Default 2013 year of the digital amp?!

Hi Soundcheck,

Happy new Year!
I just found this thread and read it all...Thanks so much for all your time and effort modifying and testing the DDX to realise its full potential. Guys like you are the true un-sung heros of DIY audio!!

I am interested in buying a few boards ( up to six ) to build into the back of my BMR ( 4.5 inch Neo) full range line array loudspeakers, pics attached.
My entire audio system is LiPo battery powered, and I am building my own music and movies fanless PC which will also be battery powered. Even my TV is about to be battey;d!

I have read all your recomendations but I am still a little unsure of the "End Game" version you suggest.
Can you please summarise your ultimate "wish list" of mods in order of most important first?
I have access to low cost LiPo batteries at all voltages and current capacities so where ever possible I am happy to bypass / replace voltage regulators...

Thanks again and here's hoping 2013 is the year of the all in one digital solution.

Cheers
Derek.
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Old 3rd January 2013, 10:19 AM   #362
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Hi.

If I'd rate my tweaks I'd put the 3.3V LipoFe and the output coils on top of the list. Without pulsetransformer - if you go SPDIF coax - you won't be happy either.

IMO that'll be the minmium to start with.


I'v been also thinking about going the active multichannel route.

What keeps me away from doing so are the facts that

1. I hardly manage to get 2 channels properly under control
2. not any DSP 2-channel solution has been better than no DSP (my main fullrange
speakers run without any crossover and my tweeters with a single cap)
I've been trying DSPing in DRC, resampling, crossover. The experienced DSP related losses were always bugging me more than the flaws they were supposed to solve.
3. I'm questioning if all the associated effort and cost is really worth it.


Good luck.

Cheers

Last edited by soundcheck; 3rd January 2013 at 10:22 AM.
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Old 3rd January 2013, 10:49 AM   #363
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Default Active crossover Vs full range ?

Hi Soundcheck,

Thanks for the info, I think I will try out 2 boards and go from there.

I to have been questioning the benefits of "problem solving of DSP" Vs the purity of full range with no DSP and no crossover.

So far I have found that poor quality DSP ( low grade equipment or even good equipment poorly implemented) results in worse sound than good full range with no DSP.

My reference for the last 10 years has been the Manger driver, an incredible driver ( at an incredible price!) and it easily shows up any faults in the signal chain.

In the last year I have been getting great results with the 4.5 inch BMR driver in line arrays. The secret is NO crossover but add in high quality Eq ie Blue Cat, Fab Filter or other mastering grade studio plugin software.
With JRiver as the VST host and Jplay running the PC operating system it gives the best of both worlds ie The purity of full range WITH the benefits of Eq and no low grade "DSP bottleneck" .

Thanks again and all the best
Derek.
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Old 3rd January 2013, 11:29 AM   #364
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What audio interface are u using?
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Old 3rd January 2013, 12:09 PM   #365
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Default Audio interface

Hiya,

At the moment running JRiver and Jplay as the music library & reply software. Hardware is a Sony Viao VPCF12MOE with an iCore 7 chip.
I also use Blue Cat and Fab Filter plugins ( hosted on JRiver) and have Reaper as a comparison.

I am building a new dedicated music / movies media PC around an Asus Mother board. Going to be interesting to be able to compare direct USB out from the Mother Board with Digital out from a good sound card...


Cheers
Derek.
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Old 3rd January 2013, 12:43 PM   #366
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HifiMeDiy !!! Are you listening ????

I'm wondering if I can connect I2S directly to the board (white arrows)??
Or would it interfere with the WM88xx.

Or.
Did anybody else manage to ocnnect I2S???

Cheers
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Old 3rd January 2013, 12:44 PM   #367
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Quote:
Originally Posted by Overkill Audio View Post
Hiya,

At the moment running JRiver and Jplay as the music library & reply software. Hardware is a Sony Viao VPCF12MOE with an iCore 7 chip.
I also use Blue Cat and Fab Filter plugins ( hosted on JRiver) and have Reaper as a comparison.

I am building a new dedicated music / movies media PC around an Asus Mother board. Going to be interesting to be able to compare direct USB out from the Mother Board with Digital out from a good sound card...


Cheers
Derek.
I was actually asking what (multi-channel) audio interface (SPDIF) you're using!?

Cheers
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Old 3rd January 2013, 02:31 PM   #368
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Default Foucusrite Saffire Fire wire to SPDIF

Hiya,

Thats easy!
Fire wire out of the Sony into the Foucusrite Saffire ( battery powered) SPDIF out into my DEQX ( battery powered) into my power amps...yes battery powered!

Also I have to tell you another way, not very High End but really remarkably good sounding for the low cost and convienience...
No fancy power amps, no fancy DEQX, not even a crossover...Just feed the SPDIF straight into a home cinema amp, ( or low cost stereo intergrated amp or even power amp) even a mid range Yamaha (mine was approx 400 I think), I run it in "Pure Direct" mode for music.

This still allows me to use JRiver Eq for the full range line array BMR's...
Its so good and low cost no hassle two of my non audio mates have asked me to build them a pair...!

Cheers
D.
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Old 7th January 2013, 08:45 AM   #369
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Quote:
Originally Posted by Overkill Audio View Post
Hiya,

Thats easy!
Fire wire out of the Sony into the Foucusrite Saffire ( battery powered) SPDIF out into my DEQX ( battery powered) into my power amps...yes battery powered!

Also I have to tell you another way, not very High End but really remarkably good sounding for the low cost and convienience...
No fancy power amps, no fancy DEQX, not even a crossover...Just feed the SPDIF straight into a home cinema amp, ( or low cost stereo intergrated amp or even power amp) even a mid range Yamaha (mine was approx 400 I think), I run it in "Pure Direct" mode for music.

This still allows me to use JRiver Eq for the full range line array BMR's...
Its so good and low cost no hassle two of my non audio mates have asked me to build them a pair...!

Cheers
D.
As far as I can see all your solutions won't provide multiple SPDIF/Toslink outputs. That's what would be needed if you run multiple DDXs.

The only multichannel (2 in /4 out) SPDIF interface I'm aware of is provided by MiniDSP.
But with that one you're tight to their DSP. Beside that I'm not sure if MiniDSP stuff would meet my overal (SQ) quality expectations.

RME as well as Lynx come with multichannel AES cards. Unfortunately the DDX320 has no AES interface. Those cards are quite expensive and would
require an additional AES-SPDIF converter !?!?.

I got stuck at this point.

Unfortunately there's no movement in the multichannel market ( Dig-IN/Dig-out) for quite some years.

Last edited by soundcheck; 7th January 2013 at 08:55 AM.
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Old 7th January 2013, 08:53 AM   #370
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The soundprotocol of AES and spdif is the same. Impedance macth might be nacessary, but with short cableruns and modern equipment a simple xlr to phono adapter does the trick
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