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TOPIC: Active crossovers, Sub integration, Dirac

Active crossovers, Sub integration, Dirac 2 months 2 weeks ago #48842

  • asx77
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Last Edit: 2 months 2 weeks ago by asx77.
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Active crossovers, Sub integration, Dirac 2 months 2 weeks ago #48843

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Ultrasonic wrote:
asx77 wrote:
Have I understood correctly?

I don't think so. I'll leave the details to Tony but in case it helps you to make sense of this yourself I'll say that the two Dirac channels will be left and right full bandwidth, not different combinations of drivers.

What miniDSP hardware are you now considering using? I've lost track...

Thanks - Yes you're right - I got the first bit (Dirac channels confused) I've corrected/edited the post - Hopefully I've got it (more) correct this time!

I think the SHD is too much of a leap in faith so planning on starting with a DDRC24
Last Edit: 2 months 2 weeks ago by asx77.
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Active crossovers, Sub integration, Dirac 2 months 2 weeks ago #48844

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asx77 wrote:
Hi Tony,
I almost follow you but let me check step 3.

Understand I should measure with REW but let's work an example using my speakers specs which are as follows...
Frequency response: 60Hz-20kHz (@3dB, -6dB at 48Hz)
Crossover frequency: 4600Hz.

Dirac 1 (Left channel to Outputs 1 & 2)
Output 1: Tweeter
Output 2: Woofer + Sub

Output 1: Set high pass to 4600Hz
Output 2: Set low pass to 4600Hz
Set the sub's own low-pass filter to 60Hz

So now the Tweeter's amp gets everything above 4600Hz
The Woofer's amp gets everything below 4600Hz (woofer only starts making sound from 60Hz and up)
Feed from the Woofer's amp goes to the sub.

Have I understood correctly?

Pretty much, despite the deliberate error that I introduced in my post. I've now corrected it rather extensively, so give it another read!
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Active crossovers, Sub integration, Dirac 2 months 1 week ago #48928

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If you get a peak at 60Hz (caused by main + sub combining) then could you also add a high pass crossover filter on Output 2 to 60Hz?
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Active crossovers, Sub integration, Dirac 2 months 1 week ago #48929

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No, because then you would remove the signal that the sub needs. That was why I suggested a shelf filter, which would attenuate below the chosen frequency but not remove it.
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Active crossovers, Sub integration, Dirac 2 months 1 week ago #48930

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@Tony_J,
The way I read @miket's suggestion was to remove the signal from either the left or right channel. Not both. So not removing the signal completely but reducing the signal by 50%.
Last Edit: 2 months 1 week ago by asx77.
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Active crossovers, Sub integration, Dirac 2 months 1 week ago #48931

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asx77 wrote:
@Tony_J,
The way I read @miket's suggestion was to remove the signal from either the left or right channel. Not both. So not removing the signal completely but reducing the signal by 50%.

I think that would still be a bad idea because you are only feeding half of the bass information to the sub. I know that frequencies that low are supposed to not carry directional information, which is why you can get away with using one sub, but in reality, the signal can (and does) differ between the two channels, so you would be losing some information.
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