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-   -   Hi-end DSP based multi-channel integrated Preamp/Crossover/DAC project (https://www.diyaudio.com/forums/vendor-s-bazaar/264743-hi-dsp-based-multi-channel-integrated-preamp-crossover-dac-project.html)

Luca72c 14th January 2018 10:05 PM

For what i understand about this dsp/dac/preamp, it's an unbelievable bargain! Sure i'll get one as soon as i have enough money! It's hard to believe that price could be lowered, even with mass production...
Anyway, are onboard opamp replaceable for opamp rolling?
If they aren't, could a customer request dip sockets onboard instead of opamps?

etlasr 25th January 2018 10:38 PM

performance measurements
 
Quote:

Originally Posted by LeRouge (https://www.diyaudio.com/forums/vendor-s-bazaar/264743-hi-dsp-based-multi-channel-integrated-preamp-crossover-dac-project-post5307807.html#post5307807)
I possibly missed this along this thread, but some measurements have been taken? (distorsions, THD+N vs frequency, noise floor, balanced frequency response (in path-through mode), etc ?)

Would also like to know these in part because they are (to me anyway) essential to know before buying and also to see how well they compare to a high quality analogue active crossover.

Tranquility Bass 26th January 2018 10:56 PM

Have done some preliminary measurements through an EMU0404 external USB sound card and the measurements look very favourable. Until I get some well specced and calibrated test and measurement equipment there's probably not much point in publishing the results as you don't know how much you are measuring is the DUT and how much is the imperfection of the measurement device.

cheers

Tranquility Bass 26th January 2018 10:57 PM

Quote:

Originally Posted by Luca72c (https://www.diyaudio.com/forums/vendor-s-bazaar/264743-hi-dsp-based-multi-channel-integrated-preamp-crossover-dac-project-post5308682.html#post5308682)
For what i understand about this dsp/dac/preamp, it's an unbelievable bargain! Sure i'll get one as soon as i have enough money! It's hard to believe that price could be lowered, even with mass production...
Anyway, are onboard opamp replaceable for opamp rolling?
If they aren't, could a customer request dip sockets onboard instead of opamps?

There's two problems with that idea. Firstly there is not enough board space to incorporate DIP sockets and secondly different opamps require different compensation schemes.

cheers

Tranquility Bass 2nd February 2018 01:06 AM

3 Attachment(s)
Managed to fix up some driver issues with my E-MU 0404 sound card and downloaded the latest trial version of Spectra Plus. Here are some distortion and noise measurements. The crusty bits in the HF spectra on one channel(top trace) is from the sound card because when I swap outputs it still remains on the same channel. The source generator is a precision 32 bit sinewave generator built into the Ultimate-Preamp. Note that these are not measurements that are done on a reference grade calibrated measuring instrument.

Distortion and Noise at 50Hz:

Attachment 674009

Distortion and Noise at 1kHz:

Attachment 674010

Distortion and Noise at 10kHz:

Attachment 674011

125dbmonster 2nd February 2018 01:41 AM

Looking good there David, thrilled that it's heading my way soon !!

soundchaser 3rd February 2018 11:49 PM

Just ordered a full up variant (my retirement present).:D

Soooo looking forward to its arrival.

Took a while to get my head around digitizing EVERYTHING (even vinyl playback) but i figured that the virtues of this device and design far outweigh any perceived drawbacks (and they are really just prejudices on my part).

It will be driving six channels of Tom Christiansen's MODULUS 86 which is built and working with very pleasing results.

As the snow boarder's say..."totally stoked".

Matt

69hotrod 7th February 2018 03:27 AM

How did you place order when online shop is showing analog and digital boards as out of stock? Any idea of restock timeline.Is online shop correct.

Tranquility Bass 7th February 2018 05:52 AM

Yes the online shop is correct. Most of the small initial production run of pre-assembled Preamps have been sent out to customers and the feedback has been very encouraging to say the least. We are now working on producing the next batch of preamps with the focus on streamlining the manufacturing process with less manual intervention now that the design has been proved.

We'll be making an announcement in March as to our plans and stock availability. Thanks for your patience.

NATDBERG 7th February 2018 12:54 PM

I'll start saving this month then....


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