What BIAS current is suitable for me? - Page 3

wuffwaff · 1st February 2006, 09:40 AM

Hi,

I think 10A of bias is a bit much for 17V and for your speakers. You will have 340 watts dissipation per channel and must use at least 12 Fets/channel. I you want thze dissipation it would probably be better to up the voltage a bit.

William

lscangus · 1st February 2006, 12:17 PM

but from Mr Pass, higher current means better quality. and i think 60W will be enough for my proac

Nelson Pass · 1st February 2006, 04:24 PM

Realistically, Alephs don't meet my needs until the rails get up
around 20 volts or more. For that power and current sources
at 50%, you are looking at a minimum of 4 amps bias total, which
comes out at 160 watts or so. If you are using 4 devices per
channel, the highest you might want to run it is maybe 5 amps,
which is 50 watts per device.

lscangus · 1st February 2006, 04:45 PM

so, will it be better if i use 21.7V and 8A?

Angus

wuffwaff · 1st February 2006, 07:40 PM

or 6A........

William

lscangus · 1st February 2006, 08:29 PM

Quote:

Originally posted by wuffwaff
or 6A........

William

but why 6A is better than 8A?

wuffwaff · 1st February 2006, 08:49 PM

Hi,

just trying to save you some money for heatsinks/ transformers/ fets etc.

You speakers are not really critical so 6A of bias should be fine.

If cost is no problem you can go for 8A bias but you have to consider that this will enlarge the problems you will encounter.

William

lscangus · 2nd February 2006, 07:14 AM

Quote:

Originally posted by wuffwaff
Hi,

just trying to save you some money for heatsinks/ transformers/ fets etc.

You speakers are not really critical so 6A of bias should be fine.

If cost is no problem you can go for 8A bias but you have to consider that this will enlarge the problems you will encounter.

William

i am using two 0.26C/W heatsinks to mount total of 16 fets. with a 12X12 CM fan to increase air flow.. so i think it will be alright.

So.. finally.. 17V or 21.7V for the rail? as if i go for 17V, i can have higher current. but will it be powerful enough for my speakers?

wuffwaff · 2nd February 2006, 09:35 AM

Then go for the higher voltage.

lscangus · 2nd February 2006, 10:04 AM

Quote:

Originally posted by wuffwaff
Then go for the higher voltage.

thanks very much! i will have a thought and i will post the picture of my ampa dn the working process later.

1st February 2006, 09:40 AM	#21
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	Hi, I think 10A of bias is a bit much for 17V and for your speakers. You will have 340 watts dissipation per channel and must use at least 12 Fets/channel. I you want thze dissipation it would probably be better to up the voltage a bit. William __________________ een ooievaar is geen konijn want zijn oren zijn te klein!

1st February 2006, 07:40 PM	#25
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	or 6A........ William __________________ een ooievaar is geen konijn want zijn oren zijn te klein!

1st February 2006, 08:49 PM	#27
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	Hi, just trying to save you some money for heatsinks/ transformers/ fets etc. You speakers are not really critical so 6A of bias should be fine. If cost is no problem you can go for 8A bias but you have to consider that this will enlarge the problems you will encounter. William __________________ een ooievaar is geen konijn want zijn oren zijn te klein!

2nd February 2006, 09:35 AM	#29
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	Then go for the higher voltage. __________________ een ooievaar is geen konijn want zijn oren zijn te klein!

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1st February 2006, 12:17 PM	#22
lscangus diyAudio Member Join Date: Oct 2005	but from Mr Pass, higher current means better quality. and i think 60W will be enough for my proac

1st February 2006, 04:24 PM	#23
Nelson Pass The one and only Join Date: Mar 2001	Realistically, Alephs don't meet my needs until the rails get up around 20 volts or more. For that power and current sources at 50%, you are looking at a minimum of 4 amps bias total, which comes out at 160 watts or so. If you are using 4 devices per channel, the highest you might want to run it is maybe 5 amps, which is 50 watts per device.

1st February 2006, 04:45 PM	#24
lscangus diyAudio Member Join Date: Oct 2005	so, will it be better if i use 21.7V and 8A? Angus

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