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Old 23rd June 2010, 03:52 PM   #1311
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I did use a Behringer upsampler, but ditched it for quite some time ago. Its not a very good upsampler... An other thing is that the PLParEQ I use consume so much CPU that I dont have CPU power for 96 kHz. So everything is 44.1 kHz, although the PLparEQ does internal upsampling to 2x the sample rate to increase accuracy at high frequencies.

True enough - there are measureable differences between digital EQ's... and maybe not so between capacitors, and certainly not between cables. When you design something, you just have to do it from an engineer's point of view, and thats why I usually regard non-measureable parameters as inaudible. Especially when it comes to cables....
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Old 23rd June 2010, 04:53 PM   #1312
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well, IDK why someone would use plpareq instead of this>
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Old 23rd June 2010, 05:29 PM   #1313
ralf is offline ralf  Germany
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Quote:
Originally Posted by oyvine View Post
Hi,
it seems like you have some experience with the VST plugin-analyser. Have you tried the export function? I have not tried this myself, but it should work for what you are trying to do I think. Unless you really WANT to learn Octave that is

regards,
yvin
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Old 24th June 2010, 01:52 PM   #1314
Fujak is offline Fujak  Germany
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Default Multiple Filters in Convolver VST

Hi,

I'm playing around the Convolver VST from John Pavel (Sourceforge). He mentioned a possibility to automatically switch between several filterfiles depending of the samplerate of the source:

Original text at the Website (http://convolver.sourceforge.net/config.html):
--------------------------------------------------------------------
"Filter list

In situations where you are using several different formats (eg, stereo 44.1kHz and 5.1 48kHz) it is convenient to be able to switch automatically between filters.

So a config file can also comprise of a list of

* filter specification config file names of the type described above; and
* WAV impulse response filenames

one per line. The filter used will then be the first to match the current sound source (in terms of number of input and output channels and sample rate). This allows you to play both stereo and 5.1 sources, say, without having to change the config file."
-----------------------------------------------------------------------

I mailed to him in order to get the correct syntax for the config_file. Unfortunately he can't remeber the right syntax. So my Question: Does anybody could help me concerning the correct syntax?

Fujak
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Old 7th July 2010, 11:51 AM   #1315
Cyan is offline Cyan  Italy
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I'll subscribe to this thread ^^.
Right now i have an auzen sound card, the prelude x-fi.
I use it's crossover to have a 2.1 system.
Maybe in a year i'll upgrade the soundcard, and hope to get something with a 32dsp at least, so i can use it as a preamp, and just link it to a power amp for the 2 speakers.
I haven't read all the 100 pages , but is it possible to have highend professional soundcard + crossover for a 2.1 system, and have the crossover work in videogames too (so, not only with a music player)?
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Old 7th July 2010, 01:19 PM   #1316
oyvine is offline oyvine  Norway
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Quote:
Originally Posted by Cyan View Post
I haven't read all the 100 pages , but is it possible to have highend professional soundcard + crossover for a 2.1 system, and have the crossover work in videogames too (so, not only with a music player)?
This thread is indeed quite overwhelming. The issue of multiple samplerates/bit-depths is probably covered several times already. Anyway, here's my take at it:

- I have a 'pure' stereo setup. Surround sound is always downmixed to stereo
- I try to limit the number of functions I cram into the xo-pc
- I only use two samplerates: 44.1kHz and 48kHz
- I use a squeezebox duet for audio playback. All my music is 44.1/16. I plan to upgrade this to a squeezebox touch.
- I use a popcorn hour A-110 for watching movies. It is the only network player I know of that can decode and downmix dts to stereo. At the moment I actually use the analog output as I have had some problems with certain codecs (maybe its a bug or it could be a user error).
- My soundcard is an emu-1820m. I do like the mixer application for this soundcard. I am not entirely convinced about the sound-quality.
- When I want to listen to music, I load the configuration file with 44.1khz samplerate slaved from the squeezbox. When I want to watch tv, I load the configuration file wwith 48khz samplerate slaved from my tuner. I use a logitech harmony one, an IR-remote receiver and event ghost to orchestrate this. The plugins that I run in console handles the change smoothly.
- I only use the xo-pc for one thing when it comes to playback: Spotify. I have payed for the premium license. I actually think that it sounds pretty good in 320kbit. The windows mixer in windows 7 (which I use) is better than previous versions. It is possible to force it to downmix to 24bit/44.1khz (or any other format).

At the moment this setup works for me. I have started looking at 96khz/24bit and it gives me a mild head-ache. I might have to bring forth my sample-rate converter. I have a demo-board for the AD1896 SRC. Another option is to actually use the pc for everything and trust the way windows handles audio.

E
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Old 4th August 2010, 07:11 PM   #1317
Havoc08 is offline Havoc08  Denmark
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Quote:
Originally Posted by yoke View Post
Hi everyone, sorry to jump in like this, but I have some question;
I have try to read whole thread couple time but never really have time to read it from beginning to the end so...
so please, have that in mind if this question was answered before

a) is there some free ware to make stereo 3 way crossover ? ( I have Audiotrak prodigy LT )

b) what is the bast way to protect tweeter while playing with active crossover ? ( if I remember correctly ShinOBIWAN manage to burn one while playing with this )

thanks

Josip
Quote:
Originally Posted by sqlkev View Post
a) I think you can go with foobar and this foo_dsp_xover

b) put a cap before the tweeter to protect it, I always test with fullrange drivers though.
Very interesting thread this.

I am going to make an old pc into a Xover testing platform and for playing with DRC etc.

I will use the Prodigy LT and I am a bit confused about what to choose.

Will the foobar + plugin work with any soundcard? Is that the best way to use my Prodigy LT or should I use the direct wire and Asio some other way instead?

My goal is to mae a test rig for testing X-overs before building them and playing with all these other DRC options when I get the time.

Thx in advance.
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Old 8th November 2010, 09:43 PM   #1318
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Quote:
Originally Posted by Fujak View Post
Hi,

I'm playing around the Convolver VST from John Pavel (Sourceforge). He mentioned a possibility to automatically switch between several filterfiles depending of the samplerate of the source:

Original text at the Website (http://convolver.sourceforge.net/config.html):
--------------------------------------------------------------------
"Filter list

In situations where you are using several different formats (eg, stereo 44.1kHz and 5.1 48kHz) it is convenient to be able to switch automatically between filters.

So a config file can also comprise of a list of

* filter specification config file names of the type described above; and
* WAV impulse response filenames

one per line. The filter used will then be the first to match the current sound source (in terms of number of input and output channels and sample rate). This allows you to play both stereo and 5.1 sources, say, without having to change the config file."
-----------------------------------------------------------------------

I mailed to him in order to get the correct syntax for the config_file. Unfortunately he can't remeber the right syntax. So my Question: Does anybody could help me concerning the correct syntax?

Fujak

Yes, I can help!

I've just read all 132 pages, as I'm embarking on my own digital crossover project.

I already have 8 channel DRC running:
User:Mark Wilcock - DRC


The information you need is here:
Convolver DSP plug-in for Windows Media Player 10 - Page 11 - AVS Forum

But I copied it here, to get the information over to this forum:

Convolver Settings:

Ok, the convolver filter/wrapper/plugin needs to be set to use your impulse files.

The filter properties will pop up when you try to use the filter with no settings loaded, or access it through Zoom Player, or through Radlight Filter Manager.

As described earlier, convolver can either use a Config file, or a Impulse Response directly, using the "Get config or IR" button.

1. Using an Impulse Response directly

Simply hit the "Get config or IR" button, and pick your stereo (or 6 channel) file.

Then hit the "Calculate optimum attenuation" button.

I don't know enough about Tuning Rigour, partitions, noise shaping to really comment.

The IR must be the same sample rate, and number of channels, as the source file.



2. Using a single Convolver Config file:

This is the easy way to set convolver to use multiple mono Impulse Responses.

Create a text file with the following format:

6 channel 96khz

96000 6 6 0
0 0 0 0 0 0
0 0 0 0 0 0
F:\DRC\CONVOLVER\96khz\LeftSpeaker96.wav
0
0.0
0.0
F:\DRC\CONVOLVER\96khz\RightSpeaker96.wav
0
1.0
1.0
F:\DRC\CONVOLVER\96khz\CentreSpeaker96.wav
0
2.0
2.0
F:\DRC\CONVOLVER\96khz\LFE96.wav
0
3.0
3.0
F:\DRC\CONVOLVER\96khz\LeftSurround96.wav
0
4.0
4.0
F:\DRC\CONVOLVER\96khz\RightSurround96.wav
0
5.0
5.0


2 channel 44.1khz

44100 2 2 0
0 0
0 0
F:\DRC\CONVOLVER\44.1khz\LeftSurround44.1.wav
0
0.0
0.0
F:\DRC\CONVOLVER\44.1khz\RightSpeaker44.1.wav
0
1.0
1.0


And so on.



The config files must point at Impulse Responses that are the same sample rate, as the source file, and must have the same number of channels described. What I do is use ffdshow to upconvert all sources to 6 channel 96khz, and just use one config file. Simple.


3. Using a multiple Convolver Config files:


Create a txt file which points at config files for each different sample rate and channel number.

For instance:

F:\DRC\CONVOLVER\config_44.txt
F:\DRC\CONVOLVER\config_48.txt
F:\DRC\CONVOLVER\config_96.txt
F:\DRC\CONVOLVER\config_44_5.1.txt

This means you need to generate suitable Impulse responses for all different cases.
Either by making measurements at all sample rates, and processing them in DRC (with suitable settings) individually (a very big bat file).
Or by resampling the IR files in Cool Edit Pro or similar.

HOWEVER, for a digital crossover, you will almost certainly want to use a standard sample rate - so I would resample everything to 96khz before convolver.
Attached Images
File Type: jpg Convolver_settings.jpg (79.6 KB, 455 views)
Attached Files
File Type: txt config_44_2channel.txt (192 Bytes, 18 views)
File Type: txt config_48_8channel.txt (718 Bytes, 14 views)
File Type: txt config_96_6channel.txt (539 Bytes, 10 views)
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Old 26th November 2010, 12:47 AM   #1319
Thunau is offline Thunau  United States
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Just a heads up for members here. thuneau.com has Black Friday special sale on Allocator and Allocator Light. Allocator Light is only 10 dollars and full Allocator with phase correction is 40 dollars. It's a significant discount for very limited time- so please see it as notice of opportunity rather than spam.
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Old 26th November 2010, 01:34 AM   #1320
doug20 is offline doug20  United States
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thanks!! I might as well buy it.

Can you recommend a USB card in a budget setup?? I have a minibook unused that I want to test with allocator.
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