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Wiring bullet tweeters

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Agayu View Drop Down
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    Posted: 26 September 2019 at 2:12pm
Hello,

Since some time we are building a 4 way soundsystem.
For the top section we have a tweeterbox with four bullettweeters
(beyma cp16 - 8ohm). 

Now the cabinet is build and the speakers arrived we want to start the wiring.
Any tips or tricks to make sure we connect everything right ?

Thanks !
Agayu


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JBK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JBK Quote  Post ReplyReply Direct Link To This Post Posted: 26 September 2019 at 2:31pm
with 4 tweeters in one box you can
- wire them all in parallel for an equivalent impedance of 2 ohms, which most amp don't like (or even can't do)
- wire them all in series for an equivalent impedance of 32 ohms, impedence for which most amps would not give usable output.
- wire them in series/parallel an equivalent impedance of 8 ohms, which is pretty standard for most amps.

else if you want to go stereo, do 2 boxes of 2, and then equivalent impedance will be either 4 or 16 ohms (if wired parallel or series, respectively)

I would suggest that you read up a bit on impedance matters, then you'll be able to answers yourself this question. Basically, the way you wire several drivers gives out an equivalent impedence, which the amp will "see". An amp has a minimum impedence (most of the time 4ohms or 2 ohms) at which it can work, you can't go under that. And the higher the impedence, the less juice the amp can give (to oversimplify, consider impedance as resistance which is depending on frequency)
Most of the time people work in 8 or 4 ohms (2 ohms for newer amps)

...


Edited by JBK - 26 September 2019 at 2:38pm
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Earplug View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Earplug Quote  Post ReplyReply Direct Link To This Post Posted: 26 September 2019 at 2:57pm
For 4 tweeters in just one box, series/parallel would be the most sensible. Nominal impedance = 8ohms. Simple.

And maybe put in a "protection capacitor" as well.   Smile




Edited by Earplug - 26 September 2019 at 2:58pm
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studio45 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote studio45 Quote  Post ReplyReply Direct Link To This Post Posted: 26 September 2019 at 3:07pm
Wire 2 in parallel, twice. Then wire the 2 parallel circuits in series. I also suggest protection - personally I wouldn't use a capacitor (on the assumption you're using modern amps with DC protection built in, and an active crossover, and you're not going to accidentally wire the scoop feed into the tweeters ;) )

Instead, use a 20 watt, 12 volt automotive light bulb in series. This will light up and reduce the power going to the tweeters if you accidentally send them too much. If you send WAAAYY too much power, it will blow like a fuse. A lot cheaper than new diaphragms!
If you find the bulb lighting up too often and you think you're not getting all you can out of your tweets, you can try putting a lightbulb on each pair of tweets, instead of one for all 4.
Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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Post Options Post Options   Thanks (0) Thanks(0)   Quote godathunder Quote  Post ReplyReply Direct Link To This Post Posted: 26 September 2019 at 3:33pm
as a matter of interest, are you putting them in an angled box (I think theyre 40deg) or just a flat fronted box?
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markie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote markie Quote  Post ReplyReply Direct Link To This Post Posted: 27 September 2019 at 10:19am
original post mis-read.

Edited by markie - 27 September 2019 at 10:20am
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Agayu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Agayu Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 11:31am
@JBK 
Thanks a lot for all the info, realy appriciate it :)
Things are a lot more clear now, bigg up !


Edited by Agayu - 04 November 2019 at 11:46am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Agayu Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 11:33am
@Earplug
Thanks a lot :) will look into the protection capacitor, might come in handy !


Edited by Agayu - 04 November 2019 at 11:47am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Agayu Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 11:39am
@Studio45
Thanks man :) it's like you say, we are not going to send the scoop feed into them. We have a seperate amp for them so normaly that couldn't happen..



Edited by Agayu - 04 November 2019 at 11:48am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Agayu Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 11:45am
Originally posted by godathunder godathunder wrote:

as a matter of interest, are you putting them in an angled box (I think theyre 40deg) or just a flat fronted box?

We have made an angled box :)

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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 12:45pm
Originally posted by Agayu Agayu wrote:

Originally posted by godathunder godathunder wrote:

as a matter of interest, are you putting them in an angled box (I think theyre 40deg) or just a flat fronted box?

We have made an angled box :)



Nice pic btw.
As far as mistakes, having a separate amp doesn't mean safe. The signal leads can get mistakenly swapped and in a high stress situation (everybody has a bad day occasionally) it can happen. Even using an active xover, I would be tempted to put a passive in the tops. The passive won't change the impedance at the xover frequency, the amp will just 'see' the tweeter load. The light bulb idea is great.
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Agayu View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Agayu Quote  Post ReplyReply Direct Link To This Post Posted: 04 November 2019 at 4:10pm
Originally posted by valve head777 valve head777 wrote:

Originally posted by Agayu Agayu wrote:

[QUOTE=godathunder]as a matter of interest, are you putting them in an angled box (I think theyre 40deg) or just a flat fronted box?

We have made an angled box :)



Nice pic btw.
As far as mistakes, having a separate amp doesn't mean safe. The signal leads can get mistakenly swapped and in a high stress situation (everybody has a bad day occasionally) it can happen. Even using an active xover, I would be tempted to put a passive in the tops. The passive won't change the impedance at the xover frequency, the amp will just 'see' the tweeter load. The light bulb idea is great.


Think you might be right :p  i supose its better to be extra safe...
So if i understand it correctly it's best to put an extra passive crossover in the tweeterbox even when we have a seperate amp for it and an active crossover ? Would we be best doing the same with the horns ?

Thanks for all the help !
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