DXC2496 and LeCleach Setup?

[Horizons]

Has anyone tried using the DCX2496 with the LeCleach Butter18 approach?

I was going to just use the stock LR48 and auto-align functions and then use an RTA to do basic EQ. Now I'm not sure this is the best way.

I have read the data and the LeCleach spreadsheet but I am not sure how to proceed using a two-way system (dual 15-inch crossed over to a 1-inch B&C compression driver in a 10-inch waveguide).

TIA

[Pano]

I've used it, it works well.

What do you need to know about it?

[Horizons]

It appears that the spreadsheet and instructions are directed at 3-way designs and not 2-way. Maybe I am dense but I am not seeing a way to parse out the 3-way data.

[Horizons]

OK, I will throw out my first guess in hoping that it will be easier for someone to correct me rather than guide me.

Setup:

2 Alpha 15As in parallel on the bottom, OB design
1 B&C DE250 compression driver in 10-inch DDS waveguide

Assuming a 1.2K xover target, I would do the following with the DCX2496:

1. Set both high and low pass filters as third order butterworth.

2. Invert polarity on the high pass compression driver.

3. Using a target 1.2K crossover, I move the low pass point to 1,044 (x 0.87) and change the high pass point to 1,368 (x 1.14).

4. Low pass driver delay set to 0.957 ms (1044 Hz = 33 cm, 0.957 ms delay)

5. High pass driver delay set to 0.73 ms (1368 Hz = 25 cm, 0.73 ms delay)

6. Set all driver phase to 0 degrees.

Is the above process the correct implementation for the LeCleach approach? Am I mission something else? Do I need to run auto-align and use those corrections as a starting point PRIOR to steps 4 and 5?

TIA

[ttan98]

Originally posted by Horizons
OK, I will throw out my first guess in hoping that it will be easier for someone to correct me rather than guide me.

Setup:

2 Alpha 15As in parallel on the bottom, OB design
1 B&C DE250 compression driver in 10-inch DDS waveguide

Assuming a 1.2K xover target, I would do the following with the DCX2496:

1. Set both high and low pass filters as third order butterworth.

2. Invert polarity on the high pass compression driver.

3. Using a target 1.2K crossover, I move the low pass point to 1,044 (x 0.87) and change the high pass point to 1,368 (x 1.14).

4. Low pass driver delay set to 0.957 ms (1044 Hz = 33 cm, 0.957 ms delay)

5. High pass driver delay set to 0.73 ms (1368 Hz = 25 cm, 0.73 ms delay)

6. Set all driver phase to 0 degrees.

Is the above process the correct implementation for the LeCleach approach? Am I mission something else? Do I need to run auto-align and use those corrections as a starting point PRIOR to steps 4 and 5?

TIA

I have a similar setup but my bass driver is 12" not 15". This combo works quite well, I have a measuring device(ie microphone and software) and I don't have to reverse polarity of the compression driver. I cross around 1.7Khz. I don.t use any delay the sound seems to be good enough. Owing to quality of my 12" driver the midrange sound is not as good as if you add another huigh quality midrange.

cheers.

[Horizons]

Originally posted by ttan98

I have a measuring device(ie microphone and software) and I don't have to reverse polarity of the compression driver. I cross around 1.7Khz. I don.t use any delay the sound seems to be good enough. Owing to quality of my 12" driver the midrange sound is not as good as if you add another huigh quality midrange.

Good info. I also have the Behringer mic and use TrueRTA software.

My first approach will be to use LR 48 dB crossovers with no polarity changes. I will have to use some EQ for the OB bass and waveguide. Are you also using the DE250, and if so, which waveguide?

[Pano]

Originally posted by Horizons
Do I need to run auto-align and use those corrections as a starting point PRIOR to steps 4 and 5?

Yes, as I understand it - and that's what I did. You need the auto-align numbers to plug into the spreadsheet. Don't forget to save right away after auto-align!! Otherwise the values are lost....

[Horizons]

Originally posted by panomaniac

Yes, as I understand it - and that's what I did. You need the auto-align numbers to plug into the spreadsheet. Don't forget to save right away after auto-align!! Otherwise the values are lost....

Thanks, what about EQ, will applying EQ after this process screw everything up?

[Pano]

Probably! :P But it should depend on Q and how close the EQ is the x-over point.

Be sure to save a normal and corrected setting so that you can compare. Or use the compare button. You should hear it. Imaging should be better with the corrected version.

Your dual woofer setup might muddle things a bit, I don't know.

[ttan98]

Originally posted by Horizons


Good info. I also have the Behringer mic and use TrueRTA software.

My first approach will be to use LR 48 dB crossovers with no polarity changes. I will have to use some EQ for the OB bass and waveguide. Are you also using the DE250, and if so, which waveguide?

More info, I use 3rd order Butterworth filter 1.7Khz, not reversal of polarity required.I suggest you view the FR curve on your s/w before you apply reversal. BW filter sounds better?

The horn on my DE250 is RCF horn H100 I got from Loudspeaker Plus very cheap less than $30, no much equalization required, you can get away with no equalization. I am happy with it much better than PE 10" spherical horn.