Introducing DSPi | A powerful, user friendly and open source DSP for less than a cup of coffee

[90sNintendoKid]

Not actually requesting

but I absolutely LOVE what Schiit did with their SYN DAC + all-analog upmixer / preamp + HPamp. Now discontinued, eBay they go for $600+ MSRP used to be half that.

Works great for film nights if you hate proprietary AVR / codecs, also gaming and music, 3.1 or 5.1

Easily revert to 2ch only via remote (for sources not conducive), both Width and Presence knobs.

I think rather than ProLogic, they did something more along the lines of David Hafler (RIP 1919-2003) "ambiance extraction" I also bought his Dynaco QD1 Series II to compare, like Schiit's version best of all.

All this to say, if in future you seek alternative algo's that's one to investigate cloning

unless Jason implements it in Forkbeard or something, then maybe not

Schiit Syn DAC/Preamp/HP Amp Review

This is a review and detailed measurements of the Schiit Syn DAC, pre-amplifier, headphone amp and surround upmixer. It was kindly sent to me by a member and used to cost US $399 before being discontinued. Member sent me this product a year ago but due to some misunderstanding on my part, I am...

www.audiosciencereview.com

Principles: Time of Arrival Delays, vs Phase tuning ?

@john61ct I'm so confused that I get FOMO about figuring out what you're really asking here, so I'm diving back in. :D I suggest you ask a single question at a time, and then pursue that to completion (until you fully understand the answer), before asking another. I will start with one of...

www.audiosciencereview.com

Introducing DSPi | A powerful, user friendly and open source DSP for less than a cup of coffee

Can it use interfaces' Word click as master? Mine use the old BNC connectors to daisy chain

www.audiosciencereview.com

I have a Syn and I liked the surround effects it extracted. My problem with it was I couldn’t eq and I nowadays I don’t mind adding a decent adc to dac eq device to my chain.

But with a few Dspi’s in the chain.

 

[Wesseling Audio Lab]

CAUTION I mentioned on Discord but a reminder here. In Linkwitz Transform field the values can't be changed as the field disappears when attempting to enter a new value.
Just checked again even worse then what I said. I put the curser on target which has default 0hz and it auto enters 10hz and auto activates with 80db boost. If I did this with music playing and amp on the amp on then BLOWN WOOFER AND POTENTIAL HEARING DAMAGE

 

[somebodyelse]

If there are converters that pass between 1x ADAT and 4x2 TOSlink in either direction (or S/PDIF Coax) at a reasonable price, (anyone please) post links

Preferably bidirectional, ideally concurrently.

Splitting is relatively easy - and you could do it with DSPi. Combining is a whole other kettle of fish unless you can guarantee the toslink inputs will be using the same format that could fit into ADAT, and synchronised.

 

[john61ct]

I have a Syn and I liked the surround effects it extracted. My problem with it was I couldn’t eq and I nowadays I don’t mind adding a decent adc to dac eq device to my chain.

But with a few Dspi’s in the chain.

continued here

DSPi users (and prospects) projects discussions

Looking at Ground strategies. Likely not sensitive as long as gnd's are connected but nice to navigate through Kicad and look into common layout practises

www.audiosciencereview.com

 

[Weeb Labs]

I will be adding a Syn clone engine shortly.

 

[john61ct]

my flabber is gasted

 

[Weeb Labs]

my flabber is gasted

The passive mode was already quite close to Hafler/Syn, so I made a few changes and rebranded it. It should now be a perfect clone of the Syn, complete with Presence control.

 

[john61ct]

Cute naming. 8-D

So this is just based on assuming Schiit followed some published math algo's?

I hope to do an A/B comparison one day. If yours is at least as good, that will greatly simplify things for me, reducing A/D D/A redundancies

 

[Weeb Labs]

Cute naming. 8-D

So this is just based on assuming Schiit followed some published math algo's?

I hope to do an A/B comparison one day. If yours is at least as good, that will greatly simplify things for me, reducing A/D D/A redundancies

This is based upon Schitt's description of the algorithm and matrix on their product page and some of Jason Stoddard's posts. It should be identical but I look forward to hearing users' thoughts.

 

[john61ct]

If there are converters that pass between 1x ADAT and 4x2 TOSlink in either direction (or S/PDIF Coax) at a reasonable price, (anyone please) post links

Preferably bidirectional, ideally concurrently.

Everything except the "reasonable price" part

Friend-Chip DMX 16

Friend-Chip DMX MODULAR SYSTEM

bizarre anti-marketing vibe...

 

[Weeb Labs]

CAUTION I mentioned on Discord but a reminder here. In Linkwitz Transform field the values can't be changed as the field disappears when attempting to enter a new value.
Just checked again even worse then what I said. I put the curser on target which has default 0hz and it auto enters 10hz and auto activates with 80db boost. If I did this with music playing and amp on the amp on then BLOWN WOOFER AND POTENTIAL HEARING DAMAGE

Thank you for the report! I will sort this out shortly.

I will soon be pushing a new beta with several optimizations, the upmixer and new Control Surfaces nouns for all of the recent additions. We are getting quite close to a final v1.1.5 release.

 

[90sNintendoKid]

I’ve done a bit of research on upmixers and did a Syn/Hafler style upmix on a Minidsp Flex HTx and I liked the results.

I’m not sure on the calculations but I’m wondering if height channel mixing could be possible.

I’ve always wanted to try out a Scatmos type system.

 

[Weeb Labs]

Splitting is relatively easy - and you could do it with DSPi. Combining is a whole other kettle of fish unless you can guarantee the toslink inputs will be using the same format that could fit into ADAT, and synchronised.

Slightly clunky but muxing four SPDIFs to ADAT via DSPi can be done using four of these ASRC TOSLINK modules. Still quite inexpensive when compared with the alternatives.

 

[frobek]

Is it possible to change I2S standard betwen I2S/LJ/RJ or is it possible to add such feature?

 

[john61ct]

Slightly clunky but muxing four SPDIFs to ADAT via DSPi can be done using four of these ASRC TOSLINK modules. Still quite inexpensive when compared with the alternatives.

Further discussed here

DSPi users (and prospects) projects discussions

Looking at Ground strategies. Likely not sensitive as long as gnd's are connected but nice to navigate through Kicad and look into common layout practises

www.audiosciencereview.com

 

[Weeb Labs]

Is it possible to change I2S standard betwen I2S/LJ/RJ or is it possible to add such feature?

Yes, this is planned.

 

[markz]

Thank you for adding extra firmware version info. Yay!

Questions:

A. Does the I2S input support 96KHz? There's an option for it.
B. Can you explain a bit more about the UART control? What does 'pin mod 4 =' imply? Is this a usb port control substitute? That would be great.

 

[Grooved]

Here is the list of changes:

• RP2350: Multichannel USB input with selectable modes for 2, 4, 6 and 8 channels.

Hi @Weeb Labs , is this only available for MacOS at this moment?
I just tried it with Windows, and didn't see any setting allowing to use the RP2350 as 8ch USB input.
Am I missing something?

 

[Weeb Labs]

Hi @Weeb Labs , is this only available for MacOS at this moment?
I just tried it with Windows, and didn't see any setting allowing to use the RP2350 as 8ch USB input.
Am I missing something?

Hello! Please take a look at this post, which explains how to set the device mode under Windows.

 

[Weeb Labs]

Thank you for adding extra firmware version info. Yay!

Questions:

A. Does the I2S input support 96KHz? There's an option for it.
B. Can you explain a bit more about the UART control? What does 'pin mod 4 =' imply? Is this a usb port control substitute? That would be great.

You are very welcome. I2S is untested at 96KHz but it should work. Please be aware that running the pipeline at 96KHz will halve the available DSP instructions without an audible benefit.

The UART and I2C interfaces talk to the same command orchestrator as the USB vendor interface, so all system commands are reachable via all interfaces. This is with the intentional exception of UART and I2C configuration commands, in order to prevent accidents in situations where USB is inaccessible.

You can read the full specification for both interfaces here.