thomann t.racks DSP 4x4 Mini Review

[grogi.giant]

I'm using this to eq my 2 subwoofers with MSO instead of the Minidsp 2x4 hd. I don't think I would have gotten much better results with the 2x4 hd.View attachment 320481

What's the maximum delay you can specify for particular input?

 

[jmar1334]

What's the maximum delay you can specify for particular input?

680 ms.

 

[Robbo99999]

What's the maximum delay you can specify for particular input?

680 ms.

Just how many hundreds of meters distance of difference between different speakers to listening position is required for a 680ms offset - well it's 230 meters, so it's comforting to know you can offset your speakers from eachother by 230 meters, ha!

 

[Roland68]

Just how many hundreds of meters distance of difference between different speakers to listening position is required for a 680ms offset - well it's 230 meters, so it's comforting to know you can offset your speakers from eachother by 230 meters, ha!

Certainly useful for open air applications...

 

[jmar1334]

I'm using this to eq my 2 subwoofers with MSO instead of the Minidsp 2x4 hd. I don't think I would have gotten much better results with the 2x4 hd.View attachment 320481

I've adjusted the low shelf filter because I had too much bass boost. I'm very satisfied with the performance of this device.

 

[grogi.giant]

Just how many hundreds of meters distance of difference between different speakers to listening position is required for a 680ms offset - well it's 230 meters, so it's comforting to know you can offset your speakers from eachother by 230 meters, ha!

MiniDSP 2x4 had only 7.2ms delay - which was way to small to facilitate testing of active-room-mode-cancellation which would require ~30ms delay.

 

[Robbo99999]

MiniDSP 2x4 had only 7.2ms delay - which was way to small to facilitate testing of active-room-mode-cancellation which would require ~30ms delay.

That's why you asked then.

 

[svetdts]

Hello, I just want to know if there are FIR filters, because Omnitronic SMARD-24RCA
has them.

 

[svetdts]

... and maybe is beter EQ for subwoofers.

 

[voodooless]

Hello, I just want to know if there are FIR filters, because Omnitronic SMARD-24RCA
has them.

You’ll need this one:

the t.racks FIR DSP 408

Digitaal Luidsprekermanagementsysteem Met FIR-filter, 4 Ingangen < - > 8 uitgangen, Sampling rate: 96 kHz, 32-Bits DSP, 24-Bits AD/DA converter, XLR-ingangen en -uitgangen, USB en RS232/485 interface, Ethernet-interface, Goed afleesbaar display,...

www.thomann.de

The Omnitronic only has 256 taps. That is barely usable.

 

[svetdts]

Why do I need so expensive just for a sub?

 

[voodooless]

Why do I need so expensive just for a sub?

If you need FIR for a sub, you’ll need way more taps. The frequency resolution is only about 190 Hz. That is totally useless. Even the more expensive t.tracks will probably be inadequate.

 

[svetdts]

Does this mean Omnitronic can't be used for sub?

 

[voodooless]

Does this mean Omnitronic can't be used for sub?

Not with FIR filters.

 

[svetdts]

I understood, thank you.

 

[Roland68]

Does anyone know if the t.racks DSP 4x4 Mini Pro is the same device, just with XLR connections?
Or are there other differences?

 

[GNK]

Does anyone know if the t.racks DSP 4x4 Mini Pro is the same device, just with XLR connections?
Or are there other differences?

Asked Thomann about this.
"Pro version has theoretically little bit better parameters, like crosstalk >80dB(;I think he meant -80dB?) while standard version has >70dB. But the main difference is xlr connection. Software is exactly the same", he said.

He said that the reason of naming it PRO is because "XLR is more pro then jack"

 

[voodooless]

It also has a few more buttons

 

[Roland68]

Asked Thomann about this.
"Pro version has theoretically little bit better parameters, like crosstalk >80dB(;I think he meant -80dB?) while standard version has >70dB. But the main difference is xlr connection. Software is exactly the same", he said.

He said that the reason of naming it PRO is because "XLR is more pro then jack"

Thanks, I didn't even think to ask directly. Sometimes I'm a little...

It also has a few more buttons

Thanks for the tip, I didn't see that. The preset switching is worth its weight in gold in a work device.

 

[abdo123]

For reference here is a 2X4HD measured using a MOTU M4 analog output -> 2X4HD -> MOTU M4 analog input using similar parameters to ASR (20-20K bandwidth, 2V input). Obviously the MOTU is nowhere near the quality of the AP in terms of analog output / input but from this measurement it is pretty clear that the limiting factor is the 2X4HD, not the MOTU.

THD+N (SINAD) is -88.5 dB so just a hair better than the Thomann. Important to note that both the Thomann and the 2X4HD are rather noisy so proper gain structure (not too high of amplifier gain) is important.

2X4HD ADC-DAC
View attachment 202116

Michael

I'm going to be using this mainly to "increase" the extension on my subwoofers so that Audyssey / Dirac doesn't keep 20Hz at -10dB because of the current aggressive roll-off of my subs (got four 12-inches, 20Hz shouldn't be an issue).

The Denon 3800H has quite the decent gain structure (mixture of Digital and Analog in the right place) and I never hear my speakers hissing so it's probably gonna be fine with subs for most people. I'm shocked to see the MiniDSP perform this badly, it did hiss like crazy when I had it though.