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Old 14th November 2012, 08:42 PM   #11
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Simply, no. Bridging is not good for low Z.
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Old 14th November 2012, 08:50 PM   #12
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no, I know its not
but with 2x 5pair outputs, running at 40Vdc ?
it ought to last forever

better than a 1000watt driving 2ohm (?)

btw, I have a 2ohm stable 40watt with just one output pair, and it can actually drive a 2ohm speaker, no problem
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Old 15th November 2012, 04:03 AM   #13
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Quote:
Originally Posted by tinitus View Post

you have no idea what you are doing
better forget about it
actually the above config is for 4 ohms not for 2 ohms...

using a 2kva suppy for class AB and expecting 1000watts wouldnt be a problem I believe... or we might even increase the psu to 3kva for more headroom...
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Old 15th November 2012, 04:33 AM   #14
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i think this one would be sufficient for driving it in 4 ohms..
1000W Mono High Power Amplifier AMP For Home Audio Or Stage Use

13 pairs of output devices...
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Old 15th November 2012, 05:33 AM   #15
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what should be the voltage supply if i want to bridge the 500W into 4 ohms amplifiers..

the load imp of the speaker will be about 4 ohms.

If its single module the amp can go upto 550w in 4 ohms with +/-80v supply..

now if its bridged then what should be the voltage supply?
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Old 15th November 2012, 07:11 AM   #16
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500w into 4R is 63volts at speaker.
Count losses, psu sagging.
About 73 volts rails will do .
Forget about bridging which brings more voltage but no more current at the speaker.

Edit:
Looking at Connex. 550 w moule specs, 78v rails 4R load is plenty

Last edited by bobodioulasso; 15th November 2012 at 07:23 AM.
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Old 15th November 2012, 07:38 AM   #17
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Quote:
Originally Posted by bobodioulasso View Post
High voltage class AB amps are unpractical as they dissipate a lot and weigh a ton.
Better to go classD or H imho.
I agree with you. I would use high-power Class D instead a monster Class AB as this is for a sub.
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Old 15th November 2012, 08:14 AM   #18
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Quote:
Originally Posted by rhythmsandy View Post
i think this one would be sufficient for driving it in 4 ohms..

13 pairs of output devices...
I dont understand, why the connex
1000watt amp module fully assembled and tested ? yeah, right

Quote:
Originally Posted by rhythmsandy View Post
using a 2kva suppy for class AB and expecting 1000watts wouldnt be a problem I believe... or we might even increase the psu to 3kva for more headroom...
ok, no problem
I have 2kVA trafos, and I can barely lift just one of them
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Old 15th November 2012, 09:54 AM   #19
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Quote:
Originally Posted by bobodioulasso View Post
Looking at Connex. 550 w moule specs, 78v rails 4R load is plenty
ah, its standard specs ? the shown heatsink looks a bit small for that

but this 1200watt from Ground Sound I would trust more

quote
The maximum power output depends on voltage supply, heat sink and load conditions. Recommendations: Voltage supply of + / - 95V, heat sink less than 0,2 K / W and minimum load of 1,5Ω.
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File Type: jpg ground sound pa12cc_b.jpg (25.1 KB, 112 views)
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Old 15th November 2012, 10:02 AM   #20
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Just meant rails voltage. Of course heatsink has to be a lot larger and even need a fan.
Anyway, at that power, current limiters are a must. I do not see any in the connex module.

Last edited by bobodioulasso; 15th November 2012 at 10:12 AM.
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