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Multi-Way Conventional loudspeakers with crossovers

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Old 13th May 2004, 10:04 AM   #11
Andy G is offline Andy G  Australia
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I'm pretty busy at the moment, but if you like I'll draw it up tomorrow for 1dB to 6dB cut on an 8 ohm tweeter, with values to use....and dump it on my web site.....

If I don't get it done by tomorrow evening, send me a reminder email !!!

I thought that Jaycar still had 10w resistors.... but even better are WES components.. they have non-inductive 10w ones.. I'll find the link and post it at the same time.
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Old 13th May 2004, 11:02 AM   #12
Andy G is offline Andy G  Australia
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Default Job done quicker than I thought !!!

here ya go..

http://users.tpg.com.au/users/gradds...rotarylpad.jpg

http://www.wagner.net.au/Catalogue/02_13.pdf

I hope that its correct, it was quickly done !!!

I'm sure someone will correct me if its not !!
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Old 13th May 2004, 01:29 PM   #13
synergy is offline synergy  United Kingdom
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kinda pleased this one popped up today as i'm stumbling through the same problem myself

i need a variable l-pad for my 3 ways that i use to do small house parties with
difference with me however is that i'm running a lot more power! - QSC RMX 2450 at least!

variable because on their own the tweeter ( Eminence APT:80) is about 10dB too high
however i sometimes use subs with them and being able to balance the treble would be of great benefit

i think i'm going to adopt the switch method as i'm worried about any pots burning up

my questions are what sort of power rating should i be after for them, baring in mind i run my amps close to but not at clip?

10w isn't enough surely? the tweeters are rated at 45w at 3.5KHz, 85w at 5KHz

the other drivers are a kappa 15LF and an Alpha 10 - you get the idea - loud, reasonable quality but cheap enough that we can fry them every so often

and does any body know anywhere in the uk i can get non-inducting resistors from?

(running parallel to this is my desire to build a wallins jig but finding 20w 8ohm non-inducting resistors in the uk is proving impossible)

thanks for your help
dave
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Old 13th May 2004, 01:42 PM   #14
markp is offline markp  United States
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A good wirewound resistor of 10 watts will easily handle 100watt peaks in use. Don't worry about using them in a higher powered system unless your average power is over 200 watt to the tweeter alone, remember the resistor is after the crossover so it sees only a fraction of the total power.
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Old 13th May 2004, 04:08 PM   #15
synergy is offline synergy  United Kingdom
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cool, no ideas on where to get them in the uk i suppose?

the only place i've found that even stocks them around the right values requires you to be trade and have a bulk order
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Old 13th May 2004, 05:21 PM   #16
Andy G is offline Andy G  Australia
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Default Resistor wattage...

I use PA gear a lot, my own speakers.....

I have cooked a 5w resistor on a PA tweeter ...once

I use 10w wire wounds in my 200w-400w pairs, and they don't even seem to get very warm.

I have doubled up in my bigger pair. (to 20w)..but they are meant to be able to handle 900w !! Again, I have not had any problem with over heating.
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