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Go Back   HardwareHeaven.com > Forums > Hardware and Related Topics > kX Project Audio Driver Support Forum > Effects and the DSP


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Old Mar 9, 2009, 03:10 PM   #1
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EQ for SPDIF

I have Audigy card. Is it possible to input to DSP any EQ for SPDIF out mode?.
I have coax cable from card (mono to RCA) to z-5500 Logitech and turned to SPDIF mode in Windvd and no idea how to EQ sound.
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Old Mar 9, 2009, 04:54 PM   #2
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Re: EQ for SPDIF

if you use only *1 cable* to connect sound card to speakers (as I *think* you stated), you should have used 'AC3 pass thru' mode of the sound card for 'true digital surround' - which means it 'bypasses' processing by the DSP - and no DSP means no DSP based EQ. So the quick answer is 'you can not add EQ with kX DSP'.

Add EQ in Win DVD (if it has it) - or adjust the speaker system (if it has it).

Otherwise - you need to use 3 cables (Spdif or analog stereo) between sound card and speaker system.

This is probably why you were not able to figure this out on your own.
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Old Mar 9, 2009, 04:57 PM   #3
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Re: EQ for SPDIF

AFAIK the WinDVD-SPDIF-Mode bypasses the DSP completely, since the output is an AC3-stream, so it´s not possible to insert any FX. Please correct me if I´m wrong.

Edit: Aahh - MD6 was faster...
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Old Mar 14, 2009, 09:24 AM   #4
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Re: EQ for SPDIF

There is another option for you, but it will require more processing, and result in some recompression. Check into 'redocnexk'. It allows you to take a multichannel audio source going to the card, route it to ASIO, then it gets encoded to AC3, and sent out the cards digital output. This would allow you to do any processing to the audio you like in kx, before it goes to ASIO, and redocnexk will turn it back into AC3 for output to your speakers. To do this, you ahve to select 6-channel as your sound format in WinDVD.

The other advantage of this, is it will work with ANY multichannel sound program you might have, including 3D sound games.
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Old Mar 16, 2009, 01:01 PM Threadstarter Thread Starter   #5
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Re: EQ for SPDIF

Thanks for all for advises.
Due to CraziFuzzy description I understand that the "process" will be
1. DVD software player set to 6 channel "analog" speakers setup
2. Surounder (5.1)
3. Processing channels by timbre , equalizer and maybe other
4. connect outputs to asio 0/1.../5
5. and 'redocnexk' proper configuration
6. kx mixer - digital output on and ac3 passtrough - spdif 0.

am i right ...?
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Old Mar 16, 2009, 05:32 PM   #6
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Re: EQ for SPDIF

Quote:
Originally Posted by rostek View Post
Thanks for all for advises.
Due to CraziFuzzy description I understand that the "process" will be
1. DVD software player set to 6 channel "analog" speakers setup
2. Surounder (5.1)
3. Processing channels by timbre , equalizer and maybe other
4. connect outputs to asio 0/1.../5
5. and 'redocnexk' proper configuration
6. kx mixer - digital output on and ac3 passtrough - spdif 0.

am i right ...?
Regs
Rostek
No on #6 - if AC3 passthru is enabled, it wont enter the kX DSP

You can do one or the other - A) AC3 passthrough and have no kX DSP processing possible or B) you use redocne to re-encode to AC3 after processing in kX DSP and sending relevant channels to the ASIO inputs (as redocne requires).

But your DVD player, when set to analog speakers will probably not try to use ac3 pass thru, so it probably wont matter if that is enabled or not, but in case you dont get redocne working, try turning that off - I dont recall from memory how kX should be configed for redocne to work - follow its instructions.
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Old Mar 17, 2009, 03:49 PM   #7
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Re: EQ for SPDIF

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Originally Posted by Maddogg6 View Post
No on #6 - if AC3 passthru is enabled, it wont enter the kX DSP

You can do one or the other - A) AC3 passthrough and have no kX DSP processing possible or B) you use redocne to re-encode to AC3 after processing in kX DSP and sending relevant channels to the ASIO inputs (as redocne requires).

But your DVD player, when set to analog speakers will probably not try to use ac3 pass thru, so it probably wont matter if that is enabled or not, but in case you dont get redocne working, try turning that off - I dont recall from memory how kX should be configed for redocne to work - follow its instructions.
He did have it right on the AC3. the AC3 DOESN"T enter the DSP for what he is trying to do. PowerDVD decodes the original AC3 to six channel PCM, and sends it to the dsp. The dsp does whatever processing he is wanting (was asking about EQ). It then sends this processed 6-channel PCM to ASIO inputs. REDOCNEXK 'records' from the ASIO and encodes the 6 discrete PCM into a Dolby Digital 5.1 (AC3) stream, which it then sends out the AC3 Passthrough feature in kx. A round about way, but the only way to dsp processing on AC3 sounds, and still get ac3 output.

An added feature of REDOCNEXK is that it can actually send the AC3 out a different AC3 passthrough capable sound card. I use this for games on my HTPC setup, as I have the games use directsound 3d, and get the 6 channel surround sound from that, use redocnekx to encode it to ac3, and then have teh ac3 output from a cheap USB sound card thatis physically located at the tv (the PC is actually in another room about 50 feet away). This way, the only cables i have running from the PC to the TV is an HDMI cable, and active USB extension.
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