Safe to increase bias on factory Aleph 30's?

hifimaker · 14th January 2005, 05:27 PM

Hi everyone,

I have a good friend with a pair of factory Aleph 30's driving a pair of Martin Logan Aerius i's.

How far can the bias be safely turned up to drive these lower impedance speakers a bit better?

Hoping to get more power into 2-4 ohms.

Thank you,

-David

Netlist · 14th January 2005, 05:33 PM

All you dare. But then again watch the heat.
You should be able to touch the heatsink for five seconds...without gloves.

/Hugo

Nelson Pass · 17th January 2005, 08:48 PM

Quote:

Originally posted by dw8083
How far can the bias be safely turned up to drive these lower impedance speakers a bit better? Hoping to get more power into 2-4 ohms.

Forget it, sez I.

hifimaker · 17th January 2005, 11:43 PM

That's what I was afraid of. The amp would sound good for a few minutes and then...

poof.

Appreciate the the kind help.

-David

Nelson Pass · 18th January 2005, 06:57 PM

You can do it, but you really can't increase the bias enough
to make that much difference. Easier to just start with a
larger design or get some Lowther or Fostex drivers.

audionut · 18th January 2005, 08:18 PM

You could parrallel the inputs and the outputs of the two channels to get more drive...I've have some home brew aleph threes running this way for the last 2 years

14th January 2005, 05:27 PM	#1
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	Safe to increase bias on factory Aleph 30's? Hi everyone, I have a good friend with a pair of factory Aleph 30's driving a pair of Martin Logan Aerius i's. How far can the bias be safely turned up to drive these lower impedance speakers a bit better? Hoping to get more power into 2-4 ohms. Thank you, -David

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14th January 2005, 05:33 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	All you dare. But then again watch the heat. You should be able to touch the heatsink for five seconds...without gloves. /Hugo

17th January 2005, 11:43 PM	#4
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	That's what I was afraid of. The amp would sound good for a few minutes and then... poof. Appreciate the the kind help. -David

18th January 2005, 06:57 PM	#5
Nelson Pass The one and only Join Date: Mar 2001	You can do it, but you really can't increase the bias enough to make that much difference. Easier to just start with a larger design or get some Lowther or Fostex drivers.

18th January 2005, 08:18 PM	#6
audionut diyAudio Member Join Date: Jan 2002 Location: Cleveland ohio	You could parrallel the inputs and the outputs of the two channels to get more drive...I've have some home brew aleph threes running this way for the last 2 years

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