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Old 16th March 2013, 10:16 PM   #651
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ADC then - Too much gain from my usual DAC to go into Najda straight. So through the Puresound L10 pre amp first...

Wow, back to back comparisons, the above against straight SPDIF in from the transport are I would say near impossible to tell a difference between. Blind test, you would have no clue.
This bodes well for ADC use of the Turntable - a Technics SP-10 / Fidelity Research FR64s arm, SPU Silver Meister cart and Icon Audio valve phonostage...

One thing - my LCD display seem to be a little faulty. I noticed on first powering up that the top line of the bottom row of text is faint. Increasing the contrast got rid of it...
However it seems to come back sometimes and fiddling with the contrast sorts it for a while or at least until next time the SET button is pressed. Not sure it is the SET button pressing or the display itself at this stage.
Not pressing the SET button. It just goes like that after a little while . Playing with the contrast sorts it every time.

Last edited by Speedysteve7; 16th March 2013 at 10:36 PM.
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Old 17th March 2013, 09:01 AM   #652
paalj is online now paalj  Norway
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Quote:
Originally Posted by chaparK View Post
Nice job! Congrats for the build!

I don't see the IR receiver module. Don't you guys intend to use a remote controller?

Paal, can you give us some detail on the PSU you're using?


Yup, if you disable Bass/Treble in the app, then this stage is bypassed and hence cannot clip.


That's great. Just be careful when loading IIR setup files. The fix is on the way.
Hi Nick,
The IR reciver is still on it's way from ebay. Hopefully it will arrive soon.

Regardig my PSU I do not have much detail as it is from the parts bin, but it's a "power one" linear supply. Output is 5V@2A and +- 12V@0,4A.

I do also have the clip issue in the bass treble section. I have put the sliders to 0 but it did not help. I have to look for the "disable button"?

Yesterday I made a 2k IIR XO that worked nicely. I imported the raw driver responses into the program and it was really easy to equalize the drivers. I am missing an "invert" button for each channel so I can easy check how the XO behaves at the crossover point.

Today FIR is on my scedule

Paal
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Old 17th March 2013, 10:09 AM   #653
chaparK is offline chaparK  Luxembourg
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Quote:
Originally Posted by Ryssen View Post
If I want channel 5 and 6 to be mono (sub)how do I rout that?
Is there a way to mute the channels (Individualy)?
Hi Ake,

I understand you want Left + Right in channel 5 and channel 6.
In the Channel Processing tab, select the dark blue block on the left hand side for these channels, and select here SUM.
SUM is defined as (LEFT+RIGHT)/2

Individual muting is available on the Monitor tab (i.e. the tab with VU meters). In order to display this tab, you must first connect the application to the board. The Monitor tab will display automatically as soon as you connect.


Quote:
Originally Posted by paalj View Post
I do also have the clip issue in the bass treble section. I have put the sliders to 0 but it did not help. I have to look for the "disable button"?
Hi Paal,

In the application menu, Settings -> Bass/Treble Settings, will display the Bass/Treble Settings dialogue.
In this dialogue you can disable Bass and Treble if this is what you want. You can also add a bit of headroom in front of the Bass/Treble section so that it won't clip anymore.

If your settings are Bass 0 and Treble 0, then clipping won't affect the output signal. The led turns on because the internals of this section are clipping but they're not being used. Maybe I should disable this led on Bass/Treble when they're both set to zero as this seems confusing.

Quote:
I am missing an "invert" button for each channel so I can easy check how the XO behaves at the crossover point.
I'm not sure what you mean here.

If you're thinking of a Polarity Invert +/-, then it's actually in there. In the Channel Processing tab, that's the square block with a "+" in it near the far right. Clicking on this square will toggle polarity (and the block will show "+" or "-" accordingly). In the Graph tab, you can check how the polarity will affect the sum of the individual curves.

If you want to see processed/unprocessed curves in the Graph tab, there's this Show Unprocessed checkbox that will allow you toggling between processing on/off in the graph only.

If I totally misunderstood, please ask again.


The software fix is with Shaun for testing. As soon as Shaun has approved the soft, I'll make it available for download. Thanks for your patience.
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Old 17th March 2013, 10:16 AM   #654
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Paal,
It's under setting / bass and treble / untick enable.
How exactly do you create the IIR XO filter files. I have not got upto speed on that yet.

I am now onto analogue.

Deck
Click the image to open in full size.

Najda now in pride of place - where the Puresound L10 used to be.

Click the image to open in full size.

My 5 amps are to the right. 3 SET amps and 2 big T-amps for the bass.

So, how does it vinyl sound (on 96KHz passthrough).
Firstly I had to back off the gain on the phonostage or it clips.

So for a bit of old school jazz. Louis and Duke - Together album (1961) - remastered to 'Dynamic Stereo', This is a bit of an audiophiles wet dream. The tonal quality of the clarinet and tumpet are what I am really listening for.
Then on to Somethin' Else - Cannonball Adderley and Miles Davis - The last album Miles D was not leader... Here it is all about that trumpet and Cannonball's Sax.

Early impressions are good. Lots of life - if anything that would be my only neg on the L10. It sounded a very little bit less lively than I would like.
No such problem with this setup. If anything the symbols are too a bit splashy but they are on the Louis Duke album.

Oh and there is absolutely NO hum! I just earth the Step up transformer as usual to a power amp and silence! I've never quite achieved that before and on any preamp set up!

BTW I do not only listen to jazz - Yesterday it was , Yello - touch, Bach Toccata and Fugue in D minor, Kristina Train, Maria Mena, Ray Lamontagne, ACDC and others

Miles and Cannonball are sounding very sweet. I really can't fault this at the moment - Hell of an achievement for ADC / DAC. I have heard a few real hash ups.
(BTW I have no connection with this project other than wanting a 5 way DSP X/O)

Lots more music to come.

Last edited by Speedysteve7; 17th March 2013 at 10:22 AM.
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Old 17th March 2013, 10:52 AM   #655
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That's cool. I think I need it.
I created 8 channels of slopes and only 4 shjow up and they are not what I created when viewed in the output graph. The others don't show at all

BTW, I am really enjoying this project - in case you couldn't tell

Quote:
Originally Posted by chaparK View Post
Hi Ake,
The software fix is with Shaun for testing. As soon as Shaun has approved the soft, I'll make it available for download. Thanks for your patience.
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Old 17th March 2013, 11:04 AM   #656
chaparK is offline chaparK  Luxembourg
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Quote:
Originally Posted by Speedysteve7 View Post
That's cool. I think I need it.
I created 8 channels of slopes and only 4 shjow up and they are not what I created when viewed in the output graph. The others don't show at all
Can you please post screenshots of the Channel Processing tab and the Graph tab?
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Old 17th March 2013, 12:57 PM   #657
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Ah - my mistake. Nothing wrong with the SW etc.
I just swapped the slopes setting around so odd things could have come out.

I have corrected and now have it playing using my DSP X/O points of

Channel 1/ 2: 0 to 100Hz BS 48dB/oct
Channel 3/4 100 Hz BS 48dB/oct to 330 Hz BS 24dB/oct
Channel 5/6 330Hz BS 12dB/oct to 1200Hz BS 12dB/oct
Channel 7/8 1200Hz BW 6dB to open

Going steeper slopes on the bass channels will help clean up the tapped horn comb filtering more than my passive 24dB / oct.

Just the inductors for the bass channels cost more this DSP project. Live and learn maybe - but this DSP was not available back then

I've still got caps on the 2 highest channels - scaredy cat I am

Quote:
Originally Posted by Speedysteve7 View Post
That's cool. I think I need it.
I created 8 channels of slopes and only 4 shjow up and they are not what I created when viewed in the output graph. The others don't show at all

BTW, I am really enjoying this project - in case you couldn't tell
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Old 17th March 2013, 01:09 PM   #658
chaparK is offline chaparK  Luxembourg
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Default Version 0.0.2 available

The software fix is available for download at the usual place:

Najda Downloads

This solves the issue reported by Shaun regarding loading of heavy IIR setup files. Again many thanks to Shaun for reporting the bug.

Xav also fixed the installer so that you don't need to run it as administrator anymore. If you had already installed the USB drivers, then you can skip that stage at the installer prompt.

Please download the file and update your system, even if you haven't seen the bug. Thanks!

Note:
- There's going to be a firmware update when you connect the first time. This will reset the board to its factory defaults.
- All your Setup files (*.nsf) can be used with this new software version.

Last edited by chaparK; 17th March 2013 at 01:11 PM.
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Old 17th March 2013, 01:24 PM   #659
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Cool will download.

Yey, it's doing my crossovers and sounding ok.


Quote:
Originally Posted by chaparK View Post
The software fix is available for download at the usual place:

Najda Downloads

This solves the issue reported by Shaun regarding loading of heavy IIR setup files. Again many thanks to Shaun for reporting the bug.

Xav also fixed the installer so that you don't need to run it as administrator anymore. If you had already installed the USB drivers, then you can skip that stage at the installer prompt.

Please download the file and update your system, even if you haven't seen the bug. Thanks!

Note:
- There's going to be a firmware update when you connect the first time. This will reset the board to its factory defaults.
- All your Setup files (*.nsf) can be used with this new software version.
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Old 17th March 2013, 04:53 PM   #660
paalj is online now paalj  Norway
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Quote:
Originally Posted by chaparK View Post
Hi Ake,

Hi Paal,

In the application menu, Settings -> Bass/Treble Settings, will display the Bass/Treble Settings dialogue.
In this dialogue you can disable Bass and Treble if this is what you want. You can also add a bit of headroom in front of the Bass/Treble section so that it won't clip anymore.

If your settings are Bass 0 and Treble 0, then clipping won't affect the output signal. The led turns on because the internals of this section are clipping but they're not being used. Maybe I should disable this led on Bass/Treble when they're both set to zero as this seems confusing.



I'm not sure what you mean here.

If you're thinking of a Polarity Invert +/-, then it's actually in there. In the Channel Processing tab, that's the square block with a "+" in it near the far right. Clicking on this square will toggle polarity (and the block will show "+" or "-" accordingly). In the Graph tab, you can check how the polarity will affect the sum of the individual curves.

If you want to see processed/unprocessed curves in the Graph tab, there's this Show Unprocessed checkbox that will allow you toggling between processing on/off in the graph only.

If I totally misunderstood, please ask again.

The software fix is with Shaun for testing. As soon as Shaun has approved the soft, I'll make it available for download. Thanks for your patience.
Hi Nick,
1) Yes, I want to disable bass/treble.Ok, I got it.
2) Sorry, Yes I mean polarity.All is OK!!
3)I tried some FIR filters today. A 2k LR4 with driver correction. I am not certain I have done it correct, but the result looks quite good. see accached pdf.
Attached Files
File Type: pdf 1_Najda FIR.pdf (357.8 KB, 85 views)
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