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Passive crossover for horn cabinet and tweeter cab
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Agayu View Drop Down
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Points: 46 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Agayu Quote  Post ReplyReply Direct Link To This Post Topic: Passive crossover for horn cabinet and tweeter cab
    Posted: 13 November 2019 at 10:58am
Hello,
I was wondering if anyone could help me out with following issue:

We are building a soundsystem and for most of the technical stuff we already have the right info except for our top section.
We will use a digital crossover to devide the signal into following groups:
Xover 1: sub
Xover 2: kick
Xover 3: mid
Xover 4: high (horn cabinet loaded with 1x rcf n580 and tweeter cabinet loaded with 4x beyma cp16)
Since we are sending this last xover to 2 different speakers/cabinets we tought putting a passive crossover in the tweeterbox so this will only play the needed frequenties. But we were wondering if we also need to install a passive crossover into the horn cabinet ??

Thanks a lot 
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studio45 View Drop Down
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Points: 3864 		Post Options Post Options   Thanks (0) Thanks(0)   Quote studio45 Quote  Post ReplyReply Direct Link To This Post Posted: 13 November 2019 at 2:04pm
It would be a matter of experimentation, really. The RCF driver + horn probably rolls off at 10kHz naturally, and the CP16's have a good response from about 5kHz up. So you could use no filter on the horn, a simple 12dB/oct crossover at 8kHz on the CP16's, and that might give you a reasonably flat response - if you also match the levels of the two boxes with L-Pads (probably on the CP16's as four of them will be quite sensitive).

However, if the RCF driver/horn combo has any peaks in its upper response due to resonances, you might need to also use a lowpass filter on it. It depends how severe they are. A simple 6dB/oct lowpass might be enough to take care of them.

I would start with the basic highpass filter on the CP16's, and go from there.

If you wire them series-parallel for an impedance of 8 ohms, then a starting point for an 8kHz filter would be a 1.8uF capacitor in series, followed by an 0.23mH inductor in shunt. Use 400v caps and 1mm inductor wire.
Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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Agayu View Drop Down
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Points: 46 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Agayu Quote  Post ReplyReply Direct Link To This Post Posted: 13 November 2019 at 3:43pm
Originally posted by studio45 studio45 wrote:

It would be a matter of experimentation, really. The RCF driver + horn probably rolls off at 10kHz naturally, and the CP16's have a good response from about 5kHz up. So you could use no filter on the horn, a simple 12dB/oct crossover at 8kHz on the CP16's, and that might give you a reasonably flat response - if you also match the levels of the two boxes with L-Pads (probably on the CP16's as four of them will be quite sensitive).

However, if the RCF driver/horn combo has any peaks in its upper response due to resonances, you might need to also use a lowpass filter on it. It depends how severe they are. A simple 6dB/oct lowpass might be enough to take care of them.

I would start with the basic highpass filter on the CP16's, and go from there.

If you wire them series-parallel for an impedance of 8 ohms, then a starting point for an 8kHz filter would be a 1.8uF capacitor in series, followed by an 0.23mH inductor in shunt. Use 400v caps and 1mm inductor wire.

Thanks man :) 
I was concidering to put a beyma f100 highpass on the tweeters, think they will do the job fine if i'm right ?
And will start off without a filter on the horns and will see what happens..
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