Wiring bullet tweeters |
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Agayu
Registered User Joined: 18 February 2019 Status: Offline Points: 46 |
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Posted: 26 September 2019 at 2:12pm |
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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
Registered User Joined: 03 March 2016 Location: Besançon Status: Offline Points: 262 |
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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
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7199 |
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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. Edited by Earplug - 26 September 2019 at 2:58pm |
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Earplugs Are For Wimps!
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3863 |
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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.
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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godathunder
Old Croc Joined: 19 July 2004 Location: wicklow Status: Offline Points: 1833 |
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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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LOUDER THAN LOUD
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markie
Old Croc Joined: 31 October 2005 Location: Sunny Liskeard. Status: Offline Points: 4570 |
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original post mis-read.
Edited by markie - 27 September 2019 at 10:20am |
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Agayu
Registered User Joined: 18 February 2019 Status: Offline Points: 46 |
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@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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Agayu
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@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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Agayu
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@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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Agayu
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We have made an angled box :) |
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valve head777
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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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Freedom of choice, choice of freedom.
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Agayu
Registered User Joined: 18 February 2019 Status: Offline Points: 46 |
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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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