A how to for a PC XO.

[ShinOBIWAN]

Originally posted by Audiophilenoob
I'm very serious about trying this... so email away

Mail sent.

[Illusus]

Sooo...what would you(whomever) recommend as the most minimalistic set-up needed for simple stereo playback?

[ShinOBIWAN]

Originally posted by m0tion
Shin:

How exactly are you capturing the room response for DRC? Is this acutally done in CurveEQ or is it just a file used by CurveEQ? Am I understanding this correctly, you run one instance of CurveEQ per driver in your system?! =) That seems like a LOT! =)

Its one instance of Curve per speaker ie. left/center/right etc.. It would be fun watching the PC try to do every driver though

CurveEQ captures the response using a Behringer ECM8000 mic connected to the soundcard line in. This creates a curve and then you instuct Curve to inverse the response and save to file and then create a preset to load this automatically whenever console is run. I'll show exactly what in a more detailed post as its difficult to explain without screen grabs.

[BillH]

Originally posted by Illusis
Sooo...what would you(whomever) recommend as the most minimalistic set-up needed for simple stereo playback?

Here's an idea. Foobar 2000 as your media player with a diy frequency divider plugin. Download plugin here.

Description of the divider plugin from another forum:
1.1 Benefit
Easy to build multi-way loudspeakers without trying over and over
auditions and re-designing on LCR(passive) filters.
You can setup multi-way loudspeakers without any LCR,
actually we have verified 2 way with 18H52 x 2 + Raven R2 ribbon.
It sounds excellent!
Linear phase(group delay) , no interferr with other driver units
because of steep FIR filter. Just read the driver specifications
and calculate efficiency differences between drivers.
And offset level and select appropriate frequency for driver
combination. That's all for your multi-way loudspeaker design.

Incredible? Yes , for me it was incredible at first, that's it!
We have distributed Scan-Speak/Vifa (DST), Manger ,
Thiel & Partner , SEAS , Raven ,Audio Technology DK....

This makes us easy to build new driver based loudspeakers!

1.2 Feature: wriiten as follows,

Version 0.34 frequency divider plugin (DSP plug-in) foobar2000.org
These specifications will be changed without notice

Name: Fequency Divider Plug-in for multi-way loudspeaker drive
Usage: used with foobar2000.exe as components
Input: foobar2000.exe data stream (Currently tested was CD-DA,Wav 44.1KHz)
Output: foobar2000.exe data stream ,
Stereo , Stereo 2way , Stereo 3way , Stereo 4way frequency divider.
Multi-way environment is decided by CPU performance.
I/O Devices: depends on foobar2000.exe and plug-in support

Filter specifications:
Filter Characteristics: FIR / linear group delay
Calculation Method: Fourrier Transform with Kaiser Window
Data Precision: 64bit double precision calculation
Filter slope: depends on the number of Taps specified at divider menu.

If max = min(MaxTaps , IdealTaps) is selected,
- High frequency Cut slope is steeper than 90dB/oct slope.
- Low frequency Cut slope is same or steeper.
Attenuation of frequency out of range: -100dB (depends on bit resolution)

Add a multichannel sound card, maybe on the motherboard, and you're set.

Here's a screen grab of the Preferences in Foobar showing a 3-way crossover built with the plugin:

[wigginjs]

Shin:

You mentioned that IIR filters aren't as resource intensive, I know that you use Waves LinEQ for your FIR filter, can you give an example of an equivilent IIR filter?

[Illusus]

Thanks Bill, now I know what to do with all these spare boxes I have kicking around.

[mbutzkies]

Bill H.

Vil and I discussed Foobar divider before. There seems to be a problem with the tweeter crossover.

Vil took measurements with divider and posted it in this thread.

http://www.diyaudio.com/forums/showt...511#post661511

I remembered playing with it and got the same weird response, I think a workaround would be to use 4 way for a 3 way etc.

The nice thing about divider is adjustable taps, in theory you could be down to 5ms delay with a 400-500hz crossover

You have a minimum of 60ms with waves lin eq

[Audiophilenoob]

Originally posted by ShinOBIWAN


I'm confused? How did it work on the Delta 66?

I don't know of anyone that's got it working on anything other than a Prodigy or RME. I think you've got confused with my earlier post when I compared the Lynx, RME and Delta. This was just idle chat on AVS forum and was purely a comparison of sound quality and in no way tried to implement any XO in these comparisons.

The last question is yes the XO will always process the signal if you've set the routing of signals up correctly. Don't worry about that for now just concentrate on a decent 2 channel 3-way XO first.

got ya... sry I was confused

alright... either dive into it with Maudio and "be a progressive" or take the sure route

I'll look into some cards and if I find one I'll post here

[foo]

Originally posted by mbutzkies
Bill H.

Vil and I discussed Foobar divider before. There seems to be a problem with the tweeter crossover.

Vil took measurements with divider and posted it in this thread.

http://www.diyaudio.com/forums/showt...511#post661511

I remembered playing with it and got the same weird response, I think a workaround would be to use 4 way for a 3 way etc.

The nice thing about divider is adjustable taps, in theory you could be down to 5ms delay with a 400-500hz crossover

You have a minimum of 60ms with waves lin eq

have u tried to use the tweeter as a midrange ?
just limit it's highs to 40khz or so ,and measure it ?

[Audiophilenoob]

Just out of curiousity

What's your past experiences with active and passive setups???

just so we can get a reference to the difference this new system makes...