Yet Another Brick Wall Filter
This one is minimum phase, and sounds a bit darker. I feel this a midway step towards the sound balance of the Konnekt 8. I think the main thing is that the volume on the DAM generally needs a bit of a nudge vs the levels I'd set with pink noise.
I think this filter might have a bit more "snap" vs the Nyquist filters but looses out a little on "air and detail".
Added a second version with FIR2 set to 8.0
This one is minimum phase, and sounds a bit darker. I feel this a midway step towards the sound balance of the Konnekt 8. I think the main thing is that the volume on the DAM generally needs a bit of a nudge vs the levels I'd set with pink noise.
I think this filter might have a bit more "snap" vs the Nyquist filters but looses out a little on "air and detail".
Added a second version with FIR2 set to 8.0
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The NOS filters are also 3.5dB louder than most of the other filters I've put together. If you don't factor that in there is a good chance you are just being swayed by the added loudness.
NOS is also pretty rolled off even at 3kHz which is why I think it's attractive to a lot of people.
Blue = New NOS, Green = DarkMPBW.
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Been discussing a few things with Blkdg on PM and he mentioned that he is using Audrivana+ to upsample to his BIII.
Thought it might be worth comparing the Izotope SRC at default setting (intermediate phase) in Audirvana @ 352.8k vs some of the DAM filters. The advantage is it's pretty quick to switch between the two without having to run around.
I did a quick check on two filters:
- NQ_K128_8v8: the immediate impression was that this one was a bit muffled, and lacking in top end detail. This confirmed my previous impressions.
- NQ_C128_100v8: It's possibly a bit louder than the A+ up sampled version, as it sounds fuller bodied, more spacious, more top end detail. But it might just be louder.
Nothing really conclusive, possibly even flawed, but if nothing else it confirms to me that the NQ_C128_100(v8) is not doing anything spectacularly bad.
I think the C128_100 or possibly C128_110 are the pick of the Nyquist filters.
The "v8" are same as previous but with FIR2 set to x8.
Listening to Martin Nonstatic "Autumn Movement" EP. at the moment. Just found this yesterday on bandcamp, and it's a sublime bit of "panoramic" down tempo dub techno that Ultimae fans will enjoy. As a bit of a bonus it's a freebie, and available as lossless.
Martin Nonstatic - Autumn Movement [SS16] | Silent Season
Thought it might be worth comparing the Izotope SRC at default setting (intermediate phase) in Audirvana @ 352.8k vs some of the DAM filters. The advantage is it's pretty quick to switch between the two without having to run around.
I did a quick check on two filters:
- NQ_K128_8v8: the immediate impression was that this one was a bit muffled, and lacking in top end detail. This confirmed my previous impressions.
- NQ_C128_100v8: It's possibly a bit louder than the A+ up sampled version, as it sounds fuller bodied, more spacious, more top end detail. But it might just be louder.
Nothing really conclusive, possibly even flawed, but if nothing else it confirms to me that the NQ_C128_100(v8) is not doing anything spectacularly bad.
I think the C128_100 or possibly C128_110 are the pick of the Nyquist filters.
The "v8" are same as previous but with FIR2 set to x8.
Listening to Martin Nonstatic "Autumn Movement" EP. at the moment. Just found this yesterday on bandcamp, and it's a sublime bit of "panoramic" down tempo dub techno that Ultimae fans will enjoy. As a bit of a bonus it's a freebie, and available as lossless.
Martin Nonstatic - Autumn Movement [SS16] | Silent Season
C128x110v8 attached.
After having a listen to David Sylvian's "River Man" vs the Izotope up sampled version, I think this is probably closer in terms of tonality and impact of percussion bass attack. Without going to minimum/intermediate phase it's going to be hard to get closer in these aspects I think.
After having a listen to David Sylvian's "River Man" vs the Izotope up sampled version, I think this is probably closer in terms of tonality and impact of percussion bass attack. Without going to minimum/intermediate phase it's going to be hard to get closer in these aspects I think.
Thanks for the update, noticed I had to drop volume couple of notches (3dB) to keep outputs about level. Will give the latest ideas a try. Interesting, Nos seemed more open, airy, with instuuments fixed in space both side to side and back to front. Certainly hearing no lack of detail, high freq roll-off. Maybe my ears....!!
The roll off seems to make the bottom end more prominent rather than it sounding rolled off.
The C128_110 is incredibly recording sensitive. Some things sound fine, but on others the bottom end sounds completely overblown. Unfortunately the one I listened to sounded fine. I stuck on something with deep bass and it was horrible. The tops are fine but the bass turns to jelly, whereas the bass is controlled with the Izotope SRC. Frustrating!!
Because the filters are so short (129 taps) the roll-off is very slow and they don't really attenuate fully until 32-33kHz. I'm testing out a version that is 385 taps long and uses more aggressive filtering to see if that helps.
The C128_110 is incredibly recording sensitive. Some things sound fine, but on others the bottom end sounds completely overblown. Unfortunately the one I listened to sounded fine. I stuck on something with deep bass and it was horrible. The tops are fine but the bass turns to jelly, whereas the bass is controlled with the Izotope SRC. Frustrating!!
Because the filters are so short (129 taps) the roll-off is very slow and they don't really attenuate fully until 32-33kHz. I'm testing out a version that is 385 taps long and uses more aggressive filtering to see if that helps.
Did some filter shootouts today...
Very confused. Hard to tell which is my favourite.
Like C128_100 and NewNOS alot.
There was something with the C128_110 that wasn't quite right??
But loaded some "Older" filters also. Well liked some of them also .
"my own" was reloaded today. And guess what. It also sounds great
Its "up with the best"...
Hard this. Anyway - really appreciate the hard filter work done here.
Very confused. Hard to tell which is my favourite.
Like C128_100 and NewNOS alot.
There was something with the C128_110 that wasn't quite right??
But loaded some "Older" filters also. Well liked some of them also .
"my own" was reloaded today. And guess what. It also sounds great
Its "up with the best"...
Hard this. Anyway - really appreciate the hard filter work done here.
Made one a bit early in this thread.
My timeschedule are quite busy so have not done so much filterbrewing lately.
http://www.diyaudio.com/forums/digi...ilter-brewing-soekris-r2r-18.html#post4233854
Well I have a mk2 version of this. Only minor changes.
My timeschedule are quite busy so have not done so much filterbrewing lately.
http://www.diyaudio.com/forums/digi...ilter-brewing-soekris-r2r-18.html#post4233854
Well I have a mk2 version of this. Only minor changes.
Yeap - sounds good too. Very difficult hearing much difference between these latest filters. Kind of thinking your filter moves the performers half a step back, and offers slightly more rounded bass? Or put another way, a little less boom in the bass. Where's the Snow Patrol track again? I'll give it a run on a few favorites I know well....
I need to have a look at the volume pot. I've found that the volume flips between two adjacent setting. I was listening to Namlook & Inoue's 2350 Broadway 2 last night - lots of long synth pads. It was so bad as to be unlistenable. It only happens at certain positions and I can over ride by setting the volume through terminal.
But I don't think that is the primary cause.
What I was hearing on Outland 3 ( Namlook & Laswell) "African Virus part 3" was amorphous, flabby bass. This was to the point you couldn't determine what kind of instrument was being used.. Switching to 352.8k problem disappeared..
What I hate is that the c128 filters appear to alter character as volume changes and are ultra sensitive to room position. I think I might know why this could be occurring but need to make sure I'm not making monuments out of transform distortions. If I'm correct it would explain why minimum and intermediate phase is preferred for minimal ringing filters.
But I don't think that is the primary cause.
What I was hearing on Outland 3 ( Namlook & Laswell) "African Virus part 3" was amorphous, flabby bass. This was to the point you couldn't determine what kind of instrument was being used.. Switching to 352.8k problem disappeared..
What I hate is that the c128 filters appear to alter character as volume changes and are ultra sensitive to room position. I think I might know why this could be occurring but need to make sure I'm not making monuments out of transform distortions. If I'm correct it would explain why minimum and intermediate phase is preferred for minimal ringing filters.
Interesting.... No volume control connected here, set to V00 via RS232. Have found I can push it up maybe to +2 +3 but getting way close to clipping. Phase can impact sound & positioning, although Ted Jordan's speakers face one another along the wall so seem less susceptible to phase errors - the man's a genius! I've only come across major issue with bass on Snow Patrol track, still to compare with Tag McLaren set up. Perhaps similar to your experience?
So I'm roughly in the right forest it... Perhaps just at the wrong tree.
http://www.listeninc.com/files/pdf/AES_123_Paper_Time-Frequency_Analysis.pdf
http://www.listeninc.com/files/pdf/AES_123_Paper_Time-Frequency_Analysis.pdf
I have tried all of the filters and I keep coming back to the NOS full bypass. I like many of the newest filters and the newNOS but everytime I switch to the full bypass I leave it there for weeks. It draws me in like none of the others. I don't have any audible aliasing issues or clipping on 97db efficient coaxials.
Interesting
That was a "mistake" NOS filter, in that there is a single coefficient and interpolation of x8. When you look at the shape of the impulse it's as close as you'll get to a single sample impulse, and should have dead flat response, with no sinc roll-off. The drawback is that the output levels are very low. It could be probably be juiced up a bit by "fixing" FIR2 so they that is correct NOS which shouldn't really do much to the overall sound but will pump up the output a bit.
I had been going to suggest this filter was about as close as you'd get to a perfect no roll-off, NOS if you can manage the low output.
I've had the DAM on the bench and nothing seems untoward. The headers are a bit loose, which I'll have to address. TOSLINK plastic case has been super glued back in place - the RX led was intact and still soldered down, only the case had broken away. :roll eyes:
I'm taking a bit of a short detour as all the jumping up and down to connect the usb - serial interface was getting beyond a joke. After a rummage in the junk box I found a prolific based usb - serial interface with a lead that was long enough to permanently connect to the Mac Mini music server. I know, I know, evil, nasty non-galvanically isolated etc, etc, etc.
I have played L.A.B.'s "Trippin' Trolls" from Psychoactive Scandosounds Vol. 2 as a precaution and noticed no ill effects.
https://www.youtube.com/watch?v=GcAcT8cs_08
Anyway I'm having a bit of a mess around with Applescript and the SerialPortX script extension from MacSoft
Seeing the firmware update seems to be scheduled for release mañana I'm going to patch up a temporary interface to the DAC so I can control via roomie remote. And at least this way I can change firmware without having to run back and forth across the room which makes it really hard to compare the filters.
I have played L.A.B.'s "Trippin' Trolls" from Psychoactive Scandosounds Vol. 2 as a precaution and noticed no ill effects.
Your choice of music and system setup forces me to also in the future to not take your sound impression reports to serious.
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