Aleph 3 , Alehp-X - Page 2

Angel Puerto · 4th August 2005, 05:09 PM

Hello,

For an universal amplifier of about 60w - 70 w in class TO my the suggestion that I gave him was:

I built a friend and it manages any speaker very well. You go on sure.

http://www.borbelyaudio.com/eb2000342.asp

Ángel

GRollins · 4th August 2005, 08:52 PM

I'm always amused and amazed by how these rumors get started. Either the Aleph or the Aleph-X will do just fine with low-Z loads, assuming sufficient bias.
When I first started the original thread on the Mini-A, just about the first thing people asked was whether it would handle a 4 ohm load. In that case, no, I had not provided enough bias for 4 ohms, although increasing the bias is a pretty simple operation. So when I did the Aleph-X I made sure to boost the current so that it would (almost) handle 4 ohms. If you want more bias still, have at it. Just make sure that you have a robust power supply.

Grey

cowanrg · 5th August 2005, 06:22 AM

i was just speculating, thats all...

as i recall (which could be incorrect), you can make an alephx that can be well suited for 4 ohm loads, but it would be HIGHLY inefficient and produce massive amounts of heat and have a very robust power supply. i just remember its better suited with 8 ohm loads.

just about any amp can be customized to work at different load ratings, some are just more suited for different applications.

im glad you are amused.

GRollins · 5th August 2005, 06:33 PM

Any amp biased heavily enough for a low-Z load is going to be less efficient, regardless of topology, gain devices, etc. The lower the load impedance, the higher the bias required, and the greater the heat generated at idle. If it's not used to produce sound, it goes up as heat, making the amp inefficient. You can't beat physics. All you can do is back off and go class AB or D or something, but then you're changing the rules of the game.

Grey

ctong · 5th August 2005, 07:02 PM

An amp becomes inefficient if you want to be able to drive both low and high impedence loads. The efficiencies for low impedence loads can be improved by reducing the rail voltage, but the amp will not be have enough voltage to drive high impedence loads.

5th August 2005, 07:02 PM	#15
ctong diyAudio Member Join Date: Jun 2005 Location: Clemson, South Carolina	An amp becomes inefficient if you want to be able to drive both low and high impedence loads. The efficiencies for low impedence loads can be improved by reducing the rail voltage, but the amp will not be have enough voltage to drive high impedence loads. __________________ CT

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4th August 2005, 05:09 PM	#11
Angel Puerto diyAudio Member Join Date: Mar 2003 Location: Barcelona	Hello, For an universal amplifier of about 60w - 70 w in class TO my the suggestion that I gave him was: I built a friend and it manages any speaker very well. You go on sure. http://www.borbelyaudio.com/eb2000342.asp Ángel

4th August 2005, 08:52 PM	#12
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	I'm always amused and amazed by how these rumors get started. Either the Aleph or the Aleph-X will do just fine with low-Z loads, assuming sufficient bias. When I first started the original thread on the Mini-A, just about the first thing people asked was whether it would handle a 4 ohm load. In that case, no, I had not provided enough bias for 4 ohms, although increasing the bias is a pretty simple operation. So when I did the Aleph-X I made sure to boost the current so that it would (almost) handle 4 ohms. If you want more bias still, have at it. Just make sure that you have a robust power supply. Grey

5th August 2005, 06:22 AM	#13
cowanrg diyAudio Member Join Date: Apr 2002 Location: Lafayette, CO	i was just speculating, thats all... as i recall (which could be incorrect), you can make an alephx that can be well suited for 4 ohm loads, but it would be HIGHLY inefficient and produce massive amounts of heat and have a very robust power supply. i just remember its better suited with 8 ohm loads. just about any amp can be customized to work at different load ratings, some are just more suited for different applications. im glad you are amused.

5th August 2005, 06:33 PM	#14
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Any amp biased heavily enough for a low-Z load is going to be less efficient, regardless of topology, gain devices, etc. The lower the load impedance, the higher the bias required, and the greater the heat generated at idle. If it's not used to produce sound, it goes up as heat, making the amp inefficient. You can't beat physics. All you can do is back off and go class AB or D or something, but then you're changing the rules of the game. Grey

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