iFi audio Pro iDSD (Official) - NEW Firmware - MQA and more.
post-14282991
Post #181 of 1,603

bluesaint

500+ Head-Fier
Joined
May 13, 2003
Messages
735
Reaction score
211
Location
Tech shuttle Yay area
Joined
May 13, 2003
Location
Tech shuttle Yay area
Posts
735
Likes
211
@iFi audio I ordered and waiting for mine to come in (this week). Quick question, as I have iCAN Pro as well, Is there a suggested mode to connect the two? ie. If i'm listening on Tube mode on iCan, should i set the iDSD Pro in Tube mode as well? What about gain? Basically trying to understand the balance/synergy when pairing the 2 together.
@iFi audio would you mind responding?
 
     Share This Post       
post-14283013
Post #182 of 1,603

hop ham

100+ Head-Fier
Joined
Oct 3, 2003
Messages
354
Reaction score
127
Joined
Oct 3, 2003
Posts
354
Likes
127
I got a defective unit, sigh, now I have to wait for dealer to get an answer from iFi on how long it will take to get a replacement. After such a long wait this is a bummer but I understand things like this happen. I'm gonna give this another shot.
 
     Share This Post       
  • Like
Reactions: alphanumerix1
post-14284733
Post #183 of 1,603

MLGrado

100+ Head-Fier
Joined
Mar 20, 2014
Messages
462
Reaction score
265
Location
Knoxville, Tn
Joined
Mar 20, 2014
Location
Knoxville, Tn
Posts
462
Likes
265
Age
43
  • filters can be selected for DSD and PCM up to 192KHz

44.1 - 192KHz
  • Additional fixed second order analogue filter @ 80kHz
DSD Filters:
  • Four different filters (selectable) with varying bandwidth
  • Additional fixed second order analogue filter @ 80kHz

The other resources (website etc.) only list for DSD filter a third order analog 80 khz cutoff with 6 db compensation for DSD level.

No mention of the usual four Burr Brown 8 tap FIR filter choices til I saw it here, so I was confused. So the implementation is like previous iFi products for DSD. Selectable FIR filter, with fixed filter following. (This fixed filter is in place for all formats, PCM included)

My only confusion now is the actual order of the filter (second or third), and how the 6db compensation is applied to DSD only and not the PCM formats?
 
Last edited:
     Share This Post       
post-14285297
Post #184 of 1,603

iFi audio

Sponsor: iFi Audio
Joined
Mar 20, 2013
Messages
6,601
Reaction score
3,448
Location
Location: HQ in the UK, but spread far and wide.
Joined
Mar 20, 2013
Location
Location: HQ in the UK, but spread far and wide.
Posts
6,601
Likes
3,448
Website
ifi-audio.com
@iFi audio would you mind responding?
It's simple. If you use balanced headphone out, then connect both devices via XLRs. If you use i.e. 6.3mm out, then go for RCAs.

I got a defective unit, sigh, now I have to wait for dealer to get an answer from iFi on how long it will take to get a replacement. After such a long wait this is a bummer but I understand things like this happen. I'm gonna give this another shot.
We're sorry to hear that. Hopefully it'll work out soon. If not, please do let us know here via PM. Thanks!
 
Last edited:
iFi audio Stay updated on iFi audio at their sponsor page on Head-Fi.
 
https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com
     Share This Post       
post-14287383
Post #185 of 1,603

iFi audio

Sponsor: iFi Audio
Joined
Mar 20, 2013
Messages
6,601
Reaction score
3,448
Location
Location: HQ in the UK, but spread far and wide.
Joined
Mar 20, 2013
Location
Location: HQ in the UK, but spread far and wide.
Posts
6,601
Likes
3,448
Website
ifi-audio.com
The other resources (website etc.) only list for DSD filter a third order analog 80 khz cutoff with 6 db compensation for DSD level. No mention of the usual four Burr Brown 8 tap FIR filter choices til I saw it here, so I was confused.
This is correct. DSD does use a fixed 8-tap analogue FIR filter followed by a passive 3rd order LCR lowpass at 80kHz. The FIR filter was selected for best rejection of ultrasonic noise while allowing full bandwidth.

So the implementation is like previous iFi products for DSD. Selectable FIR filter, with fixed filter following.
It is NOT like previous products.

All digital filters are implemented in our new Chrysopeia FPGA based DSP engine, allowing us a wide range of filters IF upsampling (PCM or DSD) is enabled.

It is also possible to completely bypass the Chrysopeia FPGA and to send non-oversampled PCM and DSD directly to the DAC, operating without digital filter for PCM or the aforementioned 8-tap analogue FIR for DSD.

(This fixed filter is in place for all formats, PCM included)
Correct. It is a necessary low-pass to remove ultrasonic noise far beyond the audio range. We use a passive LC (inductor/capacitor) filter that offers its maximum attenuation of ultrasonic noise at around 6MHz and remains effective to beyond 75MHz. In the traditional sense of the word it's not a 'reconstruction filter'.

My only confusion now is the actual order of the filter (second or third), and how the 6db compensation is applied to DSD only and not the PCM formats?
It is a 3rd order filter (60dB per decade - so 800kHz are attenuated by around 60dB).

As DSD uses a '0dBFS' setting of 50% modulation, DSD is normally 6dB quieter than a PCM version of exactly the same master as for PCM we have a '0dBFS' setting of 100% modulation.

The gain compensation add 6dB extra gain for DSD and thus removes the actual and perceived level differences.
 
iFi audio Stay updated on iFi audio at their sponsor page on Head-Fi.
 
https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com
     Share This Post       
post-14287644
Post #186 of 1,603

MLGrado

100+ Head-Fier
Joined
Mar 20, 2014
Messages
462
Reaction score
265
Location
Knoxville, Tn
Joined
Mar 20, 2014
Location
Knoxville, Tn
Posts
462
Likes
265
Age
43
This is correct. DSD does use a fixed 8-tap analogue FIR filter followed by a passive 3rd order LCR lowpass at 80kHz. The FIR filter was selected for best rejection of ultrasonic noise while allowing full bandwidth.

It is NOT like previous products.

All digital filters are implemented in our new Chrysopeia FPGA based DSP engine, allowing us a wide range of filters IF upsampling (PCM or DSD) is enabled.

It is also possible to completely bypass the Chrysopeia FPGA and to send non-oversampled PCM and DSD directly to the DAC, operating without digital filter for PCM or the aforementioned 8-tap analogue FIR for DSD.
Thank you. That clarifies exactly what I was asking. When I said it was like previous implementations, I was only referring to the general architecture for DSD when using 'Direct' mode. The unaltered bitstream goes to the FIR filter like in previous products for conversion, with a second fixed filter to follow. But if now the FIR filter is set at a fixed setting, then in that sense it is also NOT like previous products.

Sorry for the confusion!

Thanks so much!
 
     Share This Post       
post-14288136
Post #188 of 1,603

alphanumerix1

1000+ Head-Fier
Joined
May 7, 2017
Messages
1,030
Reaction score
550
Location
Brisbane, Australia
Joined
May 7, 2017
Location
Brisbane, Australia
Posts
1,030
Likes
550
very nice indeed.
 
Last edited:
     Share This Post       
post-14289539
Post #189 of 1,603

MLGrado

100+ Head-Fier
Joined
Mar 20, 2014
Messages
462
Reaction score
265
Location
Knoxville, Tn
Joined
Mar 20, 2014
Location
Knoxville, Tn
Posts
462
Likes
265
Age
43
I just want to leave a short note of thanks for you guys at iFi. I have pestered a few of you for years about this day, and it has arrived, what I consider the ultimate DSD solution currently available on the market. It truly is a 'have it your way' solution.

If you want DSP processed DSD, you get it. If you want untouched pure DSD with the only conversion element being the final analogue filter, you get it. ( well, as pure as DSD gets in all practicality. One could conceivably use a one bit switch, single tap 'bit perfect' filtering, RC filter, etc etc, but my understanding is this would essentially require a perfect switch and a perfect clock and is not practical. Even with a multi-tap FIR filter doing the conversion, it IS the simplest, purest conversion you are ever going to get for DSD.)

And now you can have state of the art DSD upsampling with the best filters available to do so in hardware, so no need for complicated software to do the trick.

Also, unlike some solutions that only have Galvanic isolation on the I2S bus, but do nothing about pure USB power, nor galvanically isolate said power, the iFi is far superior in this regard, and will not benefit much, if at all, from external Galvanic Isolation, although the OCD in me doesn't want ANY dirty USB signals to cross into the DAC, period. Call it peace of mind :)


It almost like iFi took all these other popular and differing solutions to the same 'problem' and said we will one up you and offer them all. User gets to pick what they like best.

WOW. Just WOW.

Well done, and I can't wait to get my hands on one.
 
     Share This Post       
  • Like
Reactions: alphanumerix1
post-14289563
Post #190 of 1,603

iFi audio

Sponsor: iFi Audio
Joined
Mar 20, 2013
Messages
6,601
Reaction score
3,448
Location
Location: HQ in the UK, but spread far and wide.
Joined
Mar 20, 2013
Location
Location: HQ in the UK, but spread far and wide.
Posts
6,601
Likes
3,448
Website
ifi-audio.com
It almost like iFi took all these other popular and differing solutions to the same 'problem' and said we will one up you and offer them all. User gets to pick what they like best.
Thanks. 'Options' is our middle name.
 
iFi audio Stay updated on iFi audio at their sponsor page on Head-Fi.
 
https://www.facebook.com/iFiAudio/ https://twitter.com/ifiaudio https://www.instagram.com/ifiaudio/ https://ifi-audio.com/ info@ifi-audio.com
     Share This Post       
  • Like
Reactions: alphanumerix1
post-14290446
Post #191 of 1,603

gordec

1000+ Head-Fier
Joined
Aug 14, 2006
Messages
1,253
Reaction score
571
Joined
Aug 14, 2006
Posts
1,253
Likes
571
Any early impressions anyone?
 
     Share This Post       
post-14290561
Post #192 of 1,603

bluesaint

500+ Head-Fier
Joined
May 13, 2003
Messages
735
Reaction score
211
Location
Tech shuttle Yay area
Joined
May 13, 2003
Location
Tech shuttle Yay area
Posts
735
Likes
211
Just came tonight!
 

Attachments

     Share This Post       
post-14290563
Post #193 of 1,603

bluesaint

500+ Head-Fier
Joined
May 13, 2003
Messages
735
Reaction score
211
Location
Tech shuttle Yay area
Joined
May 13, 2003
Location
Tech shuttle Yay area
Posts
735
Likes
211
20180607_194149.jpg
 
     Share This Post       
  • Like
Reactions: superuser1
post-14290564
Post #194 of 1,603

Giraku

1000+ Head-Fier
Joined
Jul 18, 2017
Messages
1,103
Reaction score
712
Location
NJ, USA
Joined
Jul 18, 2017
Location
NJ, USA
Posts
1,103
Likes
712
Any early impressions anyone?
I got mine about a week ago. I've been overwhelmed by the sheer amount of the options. That's a good thing, but the problem is it will take some serious time to post an impression.
Another problem is that this is so good sounding so that I really enjoy listening through it and forget about critical listening...
 
     Share This Post       
  • Like
Reactions: alphanumerix1
post-14290824
Post #195 of 1,603

aterville

New Head-Fier
Joined
Sep 14, 2015
Messages
25
Reaction score
2
Joined
Sep 14, 2015
Posts
25
Likes
2
The other resources (website etc.) only list for DSD filter a third order analog 80 khz cutoff with 6 db compensation for DSD level.

No mention of the usual four Burr Brown 8 tap FIR filter choices til I saw it here, so I was confused. So the implementation is like previous iFi products for DSD. Selectable FIR filter, with fixed filter following. (This fixed filter is in place for all formats, PCM included)

My only confusion now is the actual order of the filter (second or third), and how the 6db compensation is applied to DSD only and not the PCM formats?
Hello,

How do you mange DSD filter I can only access PCMs.

Thanks

Arnaud
 
     Share This Post       

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

Top