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Capacitor Help!! Compression Drivers.

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chonkie View Drop Down
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    Posted: 14 June 2017 at 11:54am
Hi all,

having some difficulty trying to figure out the correct capacitors to use to protect my compression drivers from clipping. 

Running a Jah Tubbys as preamp/crossover. 

4 flared compression drivers & 4 CP22 bullets. 

Currently using a Yamaha Amp on bullets & a martin powering the other 4 drivers. 

I have googled it and checked the site but im very very confused. 

Can someone shed some light on this. 

Have been using them without any protection for a few sessions now but i'm worried i will blow them sooner than later. 

Many thanks
Charlie
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 14 June 2017 at 7:16pm
A capacitor won´t protect anything from clipping. Not letting your amp run into clip will. A capacitor will stop DC. Putting a protection lamp/circuit would be better, but idea is not to send any distorted signal to the driver in the first place.

So proper limiting and not clipping your desk, or preamp is essential, as that will also send unwanted signals (remnants) to the comps.


Earplugs Are For Wimps!
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bob4 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 8:10am
Can you tell us the exact type of HF compression drivers and horns? how big are the venues you play? 

Proper 2" drivers on a decent horn (for ex old EVdh1 or JBL2445, or newer equivalents, especially in groups of four) with high sensitivity run with correct crossover etc will be very loud and safe. You would have to do something really stupid to cook them. The Beyma bullets will probably have a hard time keeping up. Compared to JBL bullets they are 3-6 dB less sensitive.

Like earplug said, DC blocking capacitors are useful, if you don't have any kind of passive crossover/protection in place yet. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote snowflake Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 1:23pm
Originally posted by Earplug Earplug wrote:

A capacitor won´t protect anything from clipping. Not letting your amp run into clip will. A capacitor will stop DC. Putting a protection lamp/circuit would be better, but idea is not to send any distorted signal to the driver in the first place.

So proper limiting and not clipping your desk, or preamp is essential, as that will also send unwanted signals (remnants) to the comps.




clipping an asymmetrical waveform will generate some DC component in the signal.
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matty w View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote matty w Quote  Post ReplyReply Direct Link To This Post Posted: 15 June 2017 at 4:28pm
Putting a cap in line (series) will give you a 1st order 6db per octave high pass filter, choose value of cap depending on what frequency you want it to roll off from which is dependent on what high pass your preamp already uses, the impedance of your driver at the frequency you want your cap to work from will effect what the caps value needs to be !

So for example, if your preamp high passes the comps at 1khz 24db per octave ,your cap is gonna wanna start rolling off atleast an octave below so that it doesnt effect the crossover!

The idea is that ,if your preamp decides to not work properly, it will be less likely to kill your comps
Black to black , red to red , blue to bits ....

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_djk_ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 16 June 2017 at 12:22am
Stuff turning off and on can make thumps, pops, clicks, etc that can destroy diaphragms.

A cap is cheap insurance.
djk
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madboffin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote madboffin Quote  Post ReplyReply Direct Link To This Post Posted: 16 June 2017 at 9:27am
Originally posted by _djk_ _djk_ wrote:

Stuff turning off and on can make thumps, pops, clicks, etc that can destroy diaphragms.


Yes, and 50 / 60 Hz hum from an amplifier with a bad input lead...



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