More output power at higher loads and less power at lower loads. How it is done ?

Virpz · 07:09 PM

Hello

I was looking out at some amps that perform best at higher loads.

For example:

Hifimediy T1.

- It provides 100W on 8 Ohms ( 39V 5A ? ) and 50W at 4 Ohms.

I want to know what is done in order to provide more voltage and current to the speakers because it seems to foul Ohms law ?

Forgive me if it has already discused here but I tried to search the awsner here and on the web without success.

Thank You

Saturnus · 07:18 PM

It's current limited.

100W into 8 ohm = 40V and 2.5A

50W into 4 ohms = 20V and 2.5A

Virpz · 7th February 2012, 10:00 PM

Never tought of that. LOL

One may call this kind of technique just "market strategy" ?

[]'s

Saturnus · 8th February 2012, 06:29 AM

I'd call it honesty. If the output chip used is current limited then an honest manufacturer will note that it has lower output into 4 ohms instead of letting the buyer assume that it can output twice as much in as into 8 ohms.

Many amps are in fact current limited without the manufacturer noting it.

Virpz · 8th February 2012, 03:07 PM

Good point.
I must agree with your view.

[]'s

Saturnus · 8th February 2012, 05:07 PM

Btw, in the interest off being complete. It's current limited for the package. So if you for example used it in an active speaker with a 8 ohms tweeter and a 4 ohms woofer, the total current limit would still be 5A which would be

Woofer section ... 4 ohm ... 26.67V ... 88.9W
Tweeter section ... 8 ohm ... 26.67V ... 44.5W

That'd still keep you in the 5A limit.

Pafi · 8th February 2012, 08:59 PM

I don't know what do mean.

26.67V/4ohm=6.65A

Saturnus · 8th February 2012, 09:33 PM

Quote:

Originally Posted by Pafi

I don't know what do mean.

26.67V/4ohm=6.65A

Peak, yes. RMS, no. RMS is what matters in this case.

Pafi · 9th February 2012, 06:23 PM

Then write it down! Never mix RMS and peak without mentioning it!

Still fuzzy.

7th February 2012, 07:08 PM	#1
Virpz diyAudio Member Join Date: Aug 2011	More output power at higher loads and less power at lower loads. How it is done ? Hello I was looking out at some amps that perform best at higher loads. For example: Hifimediy T1. - It provides 100W on 8 Ohms ( 39V 5A ? ) and 50W at 4 Ohms. I want to know what is done in order to provide more voltage and current to the speakers because it seems to foul Ohms law ? Forgive me if it has already discused here but I tried to search the awsner here and on the web without success. Thank You Last edited by Virpz; 7th February 2012 at 07:09 PM. Reason: gramat

7th February 2012, 07:14 PM	#2
Saturnus diyAudio Member Join Date: Jun 2005 Location: Copenhagen, Denmark	It's current limited. 100W into 8 ohm = 40V and 2.5A 50W into 4 ohms = 20V and 2.5A Last edited by Saturnus; 7th February 2012 at 07:18 PM.

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7th February 2012, 10:00 PM	#3
Virpz diyAudio Member Join Date: Aug 2011	Never tought of that. LOL One may call this kind of technique just "market strategy" ? []'s

8th February 2012, 06:29 AM	#4
Saturnus diyAudio Member Join Date: Jun 2005 Location: Copenhagen, Denmark	I'd call it honesty. If the output chip used is current limited then an honest manufacturer will note that it has lower output into 4 ohms instead of letting the buyer assume that it can output twice as much in as into 8 ohms. Many amps are in fact current limited without the manufacturer noting it.

8th February 2012, 03:07 PM	#5
Virpz diyAudio Member Join Date: Aug 2011	Good point. I must agree with your view. []'s

8th February 2012, 05:07 PM	#6
Saturnus diyAudio Member Join Date: Jun 2005 Location: Copenhagen, Denmark	Btw, in the interest off being complete. It's current limited for the package. So if you for example used it in an active speaker with a 8 ohms tweeter and a 4 ohms woofer, the total current limit would still be 5A which would be Woofer section ... 4 ohm ... 26.67V ... 88.9W Tweeter section ... 8 ohm ... 26.67V ... 44.5W That'd still keep you in the 5A limit.

8th February 2012, 08:59 PM	#7
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	I don't know what do mean. 26.67V/4ohm=6.65A

9th February 2012, 06:23 PM	#9
Pafi diyAudio Member Join Date: May 2004 Location: Budapest	Then write it down! Never mix RMS and peak without mentioning it! Still fuzzy.

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