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New Schiit - Eitr 2, not just a USB input DDC (Unison 384) but full digital preamp with Forkbeard

I've always wondered, is there a specific formula for the Fletcher-Munson curve to calculate parametric filters or exact values, or is it just increasing "treble" and "bass" until it sounds right?
Obviously DSP can do nothing without intentionally designed, mathematically precise algorithms.

Schiit is using the same LC implementation as Eitr 2's, on Gungnir 2 DAC, Mimir DAC and Yggdrasil Singular with Forkbeard.

Obviously the loudness effect is dynamic, auto-adjusts with the user's volume level control. That alone puts it head & shoulders above most historical impementations.

The user can self calibrate the "full volume" level - where to stop boosting - and also adjust the "intensity" of the boost relative to the standard curve. These feature details are extremely rare.

Finally, Lyr 5, Saga 2 and Kara all coordinate "Visual Volume," showing exactly how much headroom is left before LC (or any of the DSP effects) will start causing clipping.

There are disagreements about "the right" curve to use, original F-M vs the original ISO spec vs more recent updates.

For example, Dr. Floyd Toole recommends only boosting the lower end, not treble.

It would be nice if the user could select their favored curve, or perhaps even adjust / set their own without resorting to static PEQ settings.

But personally I suspect Schiit's LC implementation is already far superior to others currently shipping, certainly at this price point.

Schiit may not get everything right from the ASR POV, but they do in general know their Schiit.

@Floyd Toole
 
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I just got the EITR 2 today and this is my first impression:

Very nice packaging experience. Surprisingly nice. Nothing crazy fancy, but the fitted box and insert is something I didn't expect. The Forkbeard module is wrapped very well. The manual is useless.

The included C cable is extremely short for a connector. 1m. They don't say what USB version they prefer, but since all my other DACs and equipment use 2.0 B, a random (Ducky branded) 2.0 C cable ran directly from my mobo works just fine.

I don't know what I expected from a DDC (other than more outputs, which is exactly what I wanted), but this doesn't help buffer errors (overflows, underflows, etc.) This also doesn't reclock, or at least not aggressively enough to fix a stream that is at least 0.000059% - 0.000601% out of clock (this is the range I tested).

Testing with a -68dB digital preamp in EQ APO (compensated with physical amplification), A/B testing between the EITR 2 and my current DAC (e70v) results in slightly better jitter performance to my ears. But this could be bias. I also hear no noise in the same situation, despite the source being a noisy PC with a powerful GPU.

This is my first time using Forkbeard as well, so here are my thoughts:

No remote is very disappointing. Especially considering part of their marketing talk for this product was to.... add a remote to any DAC. I understand they mean digital remote, but still it's disappointing. I'm assuming the forkbeard remote you can buy on their website only works with IR and not directly with the forkbeard receiver, so I am assuming that it wouldn't work with this.

Their app is not great, I'm not sure why it gets so much praise. To actually attenuate the digital volume you need to tap or hold the up or down buttons. You cannot swipe the volume bar to change the volume, you also cannot tap to set the volume at a certain point. You are limited to the very slow up/down buttons.

The actual DSP functionality is mediocre at best. The loudness function is a pretty cool feature that you don't often see, but can't be used in addition to EQ. Balance is balance, I have nothing to say about it, it works. The parametric EQ only having 3 bands is an absolute joke. It should have just been 3 tone control sliders, there is practically nothing a 3 band parametric EQ can do except some very, very basic tone control stuff. At least if it was 5 band, you could use gimped auto EQ or use this for basic room correction (I mean, a $150 room correction box with a remote control would be killer!).

In addition, the controls are hard to use precisely, there's no reset (e.g. double click the point to reset to 0) like you would expect, you cannot manually enter the frequency, gain, and Q values (you have to use touch), and half the time, the Q slider pinch doesn't register for me. The whole control system is so janky that I can never see myself using it through the app. If I had a remote to more easily control forkbeard and use the EQ as basic tone control, I could just ignore the app all together.

Functionality that I assumed would be there (but admittedly was never advertised) was more integrated stats/status reports. E.g. incoming level, bitrate and sampling rate of the USB signal, as well as bitrate and sampling rate of the output. Which outputs are being used. Something like Qudelix 5k's stats.
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Overall, a fairly disappointing purchase. I also purchased directly from Schiit to help support them, so I can't return without a 15% restocking fee (absolute insanity, I will be purchasing from Amazon next time). I suppose it does what I want (extends my outputs from one input), but I'm kind of thinking I just wasted almost $200 here.

Are there any improvements planned to forkbeard? Why are there not more than 3 bands?
 
Wouldn't the Eitr 2 with no Forkbeard ($99) a nice way to connect PCs to Genelec monitors through AES? I've come across a lot of threads asking for an inexpensive solution and most of the cheaper options are not from well established companies.
 
Wouldn't the Eitr 2 with no Forkbeard ($99) a nice way to connect PCs to Genelec monitors through AES? I've come across a lot of threads asking for an inexpensive solution and most of the cheaper options are not from well established companies.
Yes.
 
Thank you. Would you need Forkbeard to adjust volume or could you just use the non-Forkbeard version and adjust the volume from your computer OS (or using the computer as a Roon end point)?
Digital volume control can always be applied upstream--what you'd primarily be missing out on is the loudness function.
 
Remember the main point is adding USB input to a DAC that has none, for $100.

As for the "0.000059% - 0.000601%" timing issue, way above my paygrade but I would be VERY surprised if issues in any modern Schiit USB input resulted in audible defects.

Of course on the S/PDIF side, the receiving device is responsible to derive the clocking from the incoming data stream.

...

The FB implementation is wholly dependent on the free "leftover" DSP processing capacity in the chip used for that main function. Hence, in this instance only 3 bands, while Gungnir 2's is 5-band.

To me, this is not for full tranducer curve-flattening or DRC, that is for back in a full DSP at system level, and certainly a whole different pricing range.

This little bit of "extra" preamp DSP is for "ad-hoc user controls" only, volume, tone, balance - like OG preamps but better.

TBH just the Loudness comp alone is well worth the extra $50 to me, and of course that means using it for ad-hoc MLP volume control.

I would never want a separate remote if I could use my phone.
 
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...I would never want a separate remote if I could use my phone.
Yup; the Action button on iPhones is basically made for exactly this type of scenario. One long-press to instantly pull up any designated app; just set the Action button to pull up the Forkbeard app and it's one-press access to Forkbeard control!
 
Many Android models / launcher apps do the same, Power alone or combos mapped to apps or specific functions (I use for a quick mute)
 
The idea needs to interest them personally AND be at least potentially viable financially.

Truly "any to any" requires a built in host board to manage USB gadgets

at which point might as well be a Schiit streamer

which pretty sure we will NEVER see.
 
Remember the main point is adding USB input to a DAC that has none, for $100.

As for the "0.000059% - 0.000601%" timing issue, way above my paygrade but I would be VERY surprised if issues in any modern Schiit USB input resulted in audible defects.

Of course on the S/PDIF side, the receiving device is responsible to derive the clocking from the incoming data stream.

...

The FB implementation is wholly dependent on the free "leftover" DSP processing capacity in the chip used for that main function. Hence, in this instance only 3 bands, while Gungnir 2's is 5-band.

To me, this is not for full tranducer curve-flattening or DRC, that is for back in a full DSP at system level, and certainly a whole different pricing range.

This little bit of "extra" preamp DSP is for "ad-hoc user controls" only, volume, tone, balance - like OG preamps but better.

TBH just the Loudness comp alone is well worth the extra $50 to me, and of course that means using it for ad-hoc MLP volume control.

I would never want a separate remote if I could use my phone.
I might also add that, no matter what the processing capabilities/limitations may be for the quantity of bands, the frequency range restriction on each band seems to be completely arbitrary. For example, band 2 cannot move above 1600Hz, so if I have band 3 at 15Kz for upper treble, there’s no way I could adjust the 7.5Khz area. I don’t see any reason for this restriction to be in place. How does this compare with the Gungnir 2’s “5 band” equalizer? Does it have similar restrictions?

Yup; the Action button on iPhones is basically made for exactly this type of scenario. One long-press to instantly pull up any designated app; just set the Action button to pull up the Forkbeard app and it's one-press access to Forkbeard control!
Alas, my action button will stay my flashlight. I would always take a physical remote over unlocking the phone, opening the app, waiting for it connect, flipping through menus. I mean, at least it auto connects upon launching the app, but the oddity with auto rotation alone makes the app worse to use than a remote. The functionality is nice but definitely not as good, convenient, or better than a remote. Neither one replaces another.
 
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How does this compare with the Gungnir 2’s “5 band” equalizer? Does it have similar restrictions?
No idea, post in the thread I cited for "origin story"

Loki Max is their "Flagship" dedicated EQ, 31 steps per band

Loki Mini+ the cheap one

Lokius in between

Forkbeard in general is just an add-on, so very limited.
 
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