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Old 27th March 2011, 04:40 AM   #11
infinia is offline infinia  United States
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Quote:
Originally Posted by DionG View Post
sorry im a bit of a novice here
do you recommend any software in particular?

thanks
Dion

this what I use > uni-box UniBox - Unified Box Model for Loudspeaker Design - Kristian Ougaard
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Old 27th March 2011, 04:41 AM   #12
DionG is offline DionG  Australia
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cheers thanks infinia
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Old 27th March 2011, 06:36 AM   #13
Francec is offline Francec  Australia
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Dion,
What are planning to do with the driver?

Frank
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Old 27th March 2011, 01:40 PM   #14
DionG is offline DionG  Australia
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ohk this is the setup: (all crossovers active, thus tri-amping)

1 Fahrenheit 15" subwoofer (as far as i know its an unknown brand but i got it cheap, $50, and took a gamble. i seams to have paid off, sounds nice etc.)

crossover at 80-100hz

2 bass/midrange drivers. here im thinking the 830883's

active cross about 3kHz i guess

2 tweeters, undecided yet

at the moment all are planned to be powered from LM3886 amp boards due to their quality
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Old 27th March 2011, 02:21 PM   #15
DionG is offline DionG  Australia
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I was also considering using the following as it is class D and will run cooler.
although it can reach 100W per channel its 10% THD. however, running it at 70W (0.005% THD) per channel and bridging it into an 8 ohm speakers seams good.

Class D amp
thoughts?

Dion

PS
this is the class A or AB everything was planned to run on so far:
LM3886

Last edited by DionG; 27th March 2011 at 02:26 PM.
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Old 27th March 2011, 10:51 PM   #16
Francec is offline Francec  Australia
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Dion,
I can tell you for certain that you won't use anywhere near 70 Watts for one driver in an active three way system. I have an active three way using an 8", 5 1/4" and 25mm and the transformer I use is rated at 160VA. When it is at about half volume, the guy in the next street can hear it fairly clearly so, unless you have cast iron ears, you won't use power that high.

I am in Port Melbourne, so if you are in Melbourne, you are quite welcome to have an inspection and listen.

Frank
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Old 28th March 2011, 02:01 AM   #17
DionG is offline DionG  Australia
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Frank, basically im trying to kill 2 birds with one stone, ie. general usage stuff and occasionally music for parties. the reason i wan to them to take high power is so they can be turned up, without them getting permanent damage.
again the bridged amp into the 8 ohm can only physically put out 135 watt. so say 110 to 125 watt RMS would be the maximum (assuming they can handle the volume).
Im going to guess your going to say that thats to loud but either way, do you think the 830883's will take 130W music style power or if you think theirs definitely a better option?

cheers
Dion
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Old 28th March 2011, 02:55 AM   #18
Francec is offline Francec  Australia
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Dion,
If you are tri-amping, you WON'T need to use that much power to an individual driver. There won't be any losses in a passive cross-over to worry about plus you won't be dividing the power of an amp between three drivers.
I use;
8" Peerless 830869
51/4" Peerless 832873
1" Vifa very old
tri-amped with LM3886 for all and bridged on the woofer.
I repeat the offer; if you are Melbourne, you are welcome to have the cobwebs blown out of your ears with my speakers to hear how loud they can be. If you used mine at a party, no one would hear themselves think, let alone hear what someone else is saying.

Frank
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Old 28th March 2011, 03:02 AM   #19
DionG is offline DionG  Australia
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alright haha
are you 8" ones running of single chips each?
but no sorry im in QLD, thanks for the offer though

cheers
Dion
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Old 28th March 2011, 03:06 AM   #20
infinia is offline infinia  United States
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Quote:
Originally Posted by Francec View Post
you are welcome to have the cobwebs blown out of your ears with my speakers to hear how loud they can be. If you used mine at a party, no one would hear themselves think, let alone hear what someone else is saying.

Frank
Hi
that's the typical description of a system under high distortion. I would think the mid amps are clipping 1st, with small mid drivers around 86dB/m sensitivity. I think it's more important to have extra gain pwr overhead so you never reach compression.
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