low power amp

sasek · 18th October 2011, 11:34 AM

hye all.i confuse about low power amp like f5,hiraga or jlh.its around 10-20watt and dc supply around 20v.this amp can drive 4 ohm speaker or not?how about bass sound compare solid state amp?what i think when amplifier with low power bass also will low and not loud compare with high watt amplifier.please explain to me.thanks you.

woody · 18th October 2011, 12:27 PM

It will drive 4 ohms fine. It is rated at 25W into 8 ohms and 40W into 4 ohms.
It is one heck of a fine amp and should do bass fine. Rember a 400W amp will
only sound twice as loud as a 40W amp. I realy like mine thanks again Mr. Pass.

AndrewT · 18th October 2011, 12:46 PM

Low power amps require high efficiency speakers to give respectable SPL in the domestic listening environment.

Once you are committed to the high efficiency route to adequate SPL, then any amp can drive any speaker, or at worst, modified to drive any speaker.

Groove-T · 18th October 2011, 03:59 PM

Hm.
I have a midrange ribbon with 0,16 Ohms and would love to drive it direct for best efficiency.
So it would be absolutely sufficient, if the amp can do a 5 or 6Volts RMS Swing.
But which one can hold the extreme low load, altough it is pure resistive.

AndrewT · 18th October 2011, 04:09 PM

Can Midrange ribbon with an effective load impedance of 0.16ohms be efficient?

I suspect not.

Groove-T · 18th October 2011, 04:19 PM

I think there will be a more efficient driver of course, but my MR Ribbon is 80 inches long and 2 inches wide, what allows levels more than enough for my ears.
Its just the current running trough, which is deciding.
Dont' know the real efficiency, but with preresistors the amplifiers most power will be transformed into heat.

Roscoe Primrose · 18th October 2011, 05:35 PM

Quote:

Originally Posted by AndrewT

Can Midrange ribbon with an effective load impedance of 0.16ohms be efficient?

I suspect not.

Why on earth not? If it can radiate a lot of sound with a small amount of power in, it's efficient. Doesn't matter if it's characteristic impedance is 0.16ohm, 8ohm, 16ohm or 6000ohm...

Roscoe

AndrewT · 18th October 2011, 05:41 PM

The problem is the power input requires very high current to reproduce the sound output.
That, I suspect, becomes an inherent limitation to the efficiency of the speaker.

Roscoe Primrose · 18th October 2011, 06:29 PM

Please explain how requiring high current relates in any way to efficiency....

Itsmee · 18th October 2011, 07:43 PM

Quote:

Originally Posted by Groove-T

Hm.
I have a midrange ribbon with 0,16 Ohms and would love to drive it direct for best efficiency.
So it would be absolutely sufficient, if the amp can do a 5 or 6Volts RMS Swing.
But which one can hold the extreme low load, altough it is pure resistive.

At 6V RMS thats 37.5A, with power rails of +- 15V (thats probably the lowest you could get away with for a push pull output stage) the power consumption would be 1125W; you would be better off using a matching transformer.

Quote:

Originally Posted by Roscoe Primrose

Please explain how requiring high current relates in any way to efficiency....

It's not the speaker efficiency, it's the amplifier, note the power consumption above, for 225W output, I think that is what Andrew is saying.

18th October 2011, 11:34 AM	#1
sasek diyAudio Member Join Date: May 2011	low power amp hye all.i confuse about low power amp like f5,hiraga or jlh.its around 10-20watt and dc supply around 20v.this amp can drive 4 ohm speaker or not?how about bass sound compare solid state amp?what i think when amplifier with low power bass also will low and not loud compare with high watt amplifier.please explain to me.thanks you.

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18th October 2011, 12:27 PM	#2
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	It will drive 4 ohms fine. It is rated at 25W into 8 ohms and 40W into 4 ohms. It is one heck of a fine amp and should do bass fine. Rember a 400W amp will only sound twice as loud as a 40W amp. I realy like mine thanks again Mr. Pass.

18th October 2011, 12:46 PM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Low power amps require high efficiency speakers to give respectable SPL in the domestic listening environment. Once you are committed to the high efficiency route to adequate SPL, then any amp can drive any speaker, or at worst, modified to drive any speaker.

18th October 2011, 03:59 PM	#4
Groove-T diyAudio Member Join Date: Apr 2008	Hm. I have a midrange ribbon with 0,16 Ohms and would love to drive it direct for best efficiency. So it would be absolutely sufficient, if the amp can do a 5 or 6Volts RMS Swing. But which one can hold the extreme low load, altough it is pure resistive.

18th October 2011, 04:09 PM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Can Midrange ribbon with an effective load impedance of 0.16ohms be efficient? I suspect not.

18th October 2011, 04:19 PM	#6
Groove-T diyAudio Member Join Date: Apr 2008	I think there will be a more efficient driver of course, but my MR Ribbon is 80 inches long and 2 inches wide, what allows levels more than enough for my ears. Its just the current running trough, which is deciding. Dont' know the real efficiency, but with preresistors the amplifiers most power will be transformed into heat.

18th October 2011, 05:41 PM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	The problem is the power input requires very high current to reproduce the sound output. That, I suspect, becomes an inherent limitation to the efficiency of the speaker.

18th October 2011, 06:29 PM	#9
Roscoe Primrose diyAudio Member Join Date: Jan 2004 Location: Virginia, USA	Please explain how requiring high current relates in any way to efficiency....