Any full digital amp project(s) that may rival NAD C390DD? - Page 2 - diyAudio
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Old 2nd June 2013, 09:04 AM   #11
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Hi.

Putzey is a "salesman" first of all. He needs to sell stuff that he can deliver.

Quite some PWM/PCM technology is covered by patents.

As long as he is not coming up with his own ideas, he won't jump on that train. For sure he won't license any of the stuff out there.

And if you commit yourself to this kind of business, you should also be able to come up with highest quality inputstages (USB,SPDIF,HDMI,wireless,blutooth,ethernet). And that's a real challenge.

I still own 2 UCD180HG btw. These are settling dust since quite some time.


I wrote them a mail a while ago, asking if they wouldn't be interested building a PCM/PWM amp. I received a pretty clear "NO".


I know that HifiMeDIY is working on a different FDA project. However. Their 40$ Sabre DACs are selling like mushrooms. That's where they put priorities.
And then those guys are not commited to highest audio quality. They focus on best price/performance ratio. We can't really expect top level stuff.


To me the upopming NAD devices seem to be very promising as universal devices and on top of that you'll get the known DDFA qualities.

With networking,bluetooth and USB these devices are most flexible.
I hope that these devices deliver even better SQ then its predecssors.

Options of how to use them are really interesting.

You just stream your stuff from your (or any other family member) phone/tablet via bluetooth to the amp.

Or if you like, you take the squeezeplayer app and make your droid a squeeze-bluetooth transport towards the NAD.

You can use them in a DLNA environment. OR simple as USB DAC/AMP.


For sure I'll have one of these over here for testing as soon as they
come out.


Cheers
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Old 25th July 2013, 07:41 PM   #12
iperv is offline iperv  Italy
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Hi all.
I'm pretty interessed on building a full digital system, biampling with 2 ways, with the use of JRiver or so, with the best SQ/Price ratio.
Now what I found around the net are very few really interesting boards, so I'm a little confused.
In the end, my troubles are about the choice of a 96/192KHz i2s to analog amplifier, whit more than 20W/ch (like miniAmp) or 40W/ch (like stereophonics true digital amplifier board).
I saw that there are no more hifimediy boards in stock, and my knowledge about digital amplifier bords ends here (not concerning true advanced projects).
Are there out there TI evaluation boards that allow to easily build a pair of stereo ampli of, say, 80W/channel?
My goal is to route out from usb to i2s 8 channel using USBStreamer by miniDSP, that allow the 192KHz/ch (used like an asio soundcard), xoing the 2way with jriver.

I don't like the concept of first make a clean conversion from i2s to analog with the best dac I got, and then re-converse my precious digital signal from analog to pwm on the first stage of, say, Hypex/Abletec.

I really would like to know any suggest on this direction.

TIA.
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Old 26th July 2013, 07:22 AM   #13
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TI have lots of eval boards, see my link in previous link
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Old 26th July 2013, 07:28 AM   #14
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maybe this TAS5504-5142V4 Evaluation Module (EVM) - TAS5504-5142V4EVM - TI Tool Folder
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Old 27th July 2013, 04:20 AM   #15
iperv is offline iperv  Italy
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Tx.
This evm is still too expensive.
I need 4 channel to obtain a two way system.
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Old 27th July 2013, 09:09 AM   #16
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The TI eval boards are all expensive. That's why I buy Panasonic SA-XR used. You get 6 channels for 100$. The old SA-XR10 is 45 watt as i remember (6 or 8 ohm) and is eval boards build in to a cabinet. I don't know how easy it is, but some help could be found here (far to technical for me)

High Resolution Multi-Channel Digital Interface
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Old 28th July 2013, 03:43 AM   #17
iperv is offline iperv  Italy
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I looked for one on ebay, but it seems like no one is selling now.
Where can i find a good one?
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Old 28th July 2013, 10:07 AM   #18
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they pop up from time to time. All SA-XR models are pure digital.
I find mine on danish site Nyt og brugt, køb og salg på DBA - Danmarks største handelsportal og hifi sites. dba is part of ebay but only in danish
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Old 28th July 2013, 01:56 PM   #19
iperv is offline iperv  Italy
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Ok, i found some sa-xr online.
Are they all models ok?
Are they easily tweakable to allow 4 channells?
I Will appreciate any useful link.
And, of course, thank you very much indeed for your suggestions.
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Old 28th July 2013, 03:44 PM   #20
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I don't think it's easy but they should all be modifiable

look here

4x S/PDIF Transceiver board
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