Wattage of Pass F5 - Page 5

Russellc · 24th January 2012, 11:59 PM

Quote:

Originally Posted by KatieandDad

I think you read my posting on the F5 build thread.

My speakers are power hungry, as are most of the B&W family.

The guy that built that F5 was after LOUD, and the F5 doesn't really do LOUD, it is better in the FIRST-WATT fraternity providing BRILLIANT musical quality at MODERATE levels.

What he called LOUD was probably deafening. I've measured the power into my speakers at COMFORTABLY LOUD and its only about 6W RMS.

My E waves, and also needless to say the A7s will get VERY loud!

Russellc

Russellc · 25th January 2012, 12:08 AM

Quote:

Originally Posted by KatieandDad

At 25W it will clip early into the program at anything about COMFORTABLY LOUD.

Not true with speakers matched to the job at hand. I can drive you from the room with A-7 or the E waves....with your speaks, this is no doubt true, but they are somewhat power hungry for an F-5.

Russellc

tinitus · 25th January 2012, 12:31 AM

I have 50watt(AB)
always plenty of power

apart from those few crazy days when I get the urge to play really loud
and it ussually ends at full crancked volume
but then distortion gets annoying
and still not what I would call really loud

then I back off a bit, and decide its loud enough, and clean

but to make it bloddy sceaming loud, you will probably need 100watt minimum
and then most likely still loose a good part of the important quality
also consider that your room 'distorts' the sound more at louder SPL
and speakers distortion rise, both the drivers and crossovers

I think its just a bad listening habbit, or a party thing
or some strange need to try and impress someone
well, just my personal opinion about playing too loud
or me getting older

still like it loud tho, so its probably good I only have small power amps

ramallo · 25th January 2012, 01:26 AM

Quote:

Originally Posted by KatieandDad

The F5 is truly lovely at LOW volume with VERY EFFICIENT speakers.

At 25W it will clip early into the program at anything about COMFORTABLY LOUD.

I presume that your "very efficient" speakers aren't really "very efficient". With my loudspeakers (96dB 1W/1m) I can get up to 106dB on my sofa. Except if the listener are deaf, is more than enough for a loud listening

ra7 · 25th January 2012, 02:24 AM

People who say the F5 doesn't go loud are either using inefficient speakers or have skipped the preamp. Also, everyone should read the F5 article. It clearly states that it can deliver upto 54W in class AB as the single output device delivers all the current to the load.

pdhanwada · 25th January 2012, 05:53 AM

Quote:

Originally Posted by ra7

People who say the F5 doesn't go loud are either using inefficient speakers or have skipped the preamp. Also, everyone should read the F5 article. It clearly states that it can deliver upto 54W in class AB as the single output device delivers all the current to the load.

Can you point me to the F5 specifications article which you are referring to.

Thanks
pandu

h_a · 25th January 2012, 05:57 AM

Quote:

Originally Posted by pdhanwada

Can you point me to the F5 specifications article which you are referring to.

Thanks
pandu

Page 6 and onwards in
http://www.firstwatt.com/pdf/prod_f5_man.pdf

Hannes

ra7 · 25th January 2012, 07:33 AM

"The power of 2.6 amps into 8 ohms is I^2 * R, or 2.6 * 2.6 * 8 = 54 watts. This is the peak
value, and the nature of an undistorted sine wave is that the peak wattage is twice the
average, so this circuit would operate 27 watts average Class A into 8 ohms. At currents
above 2.6 amps one of the transistors will shut off, leaving the other to continue to increase
beyond the 2.6 amps in what is known as Class AB."

I don't have to say who said that, right?

pdhanwada · 25th January 2012, 08:29 AM

Quote:

Originally Posted by Andersonix

Regarding the B&K Ref 30, I believe the 3V max output is a B&K OM typo, and it is actually 9Vrms max (AD712 running on +/-15V rails), just like all the other B&K preamps of this vintage that I've seen...

I dont understand. Is AD712 an amplifier. I pulled this 3 vrms from the manual.

pdhanwada · 25th January 2012, 08:32 AM

Quote:

Originally Posted by ra7

"The power of 2.6 amps into 8 ohms is I^2 * R, or 2.6 * 2.6 * 8 = 54 watts. This is the peak
value, and the nature of an undistorted sine wave is that the peak wattage is twice the
average, so this circuit would operate 27 watts average Class A into 8 ohms. At currents
above 2.6 amps one of the transistors will shut off, leaving the other to continue to increase
beyond the 2.6 amps in what is known as Class AB."

I don't have to say who said that, right?

What happens in case of double output mosfets.

Thanks
pandu

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25th January 2012, 12:31 AM	#43
tinitus diyAudio Moderator Join Date: Nov 2005	I have 50watt(AB) always plenty of power apart from those few crazy days when I get the urge to play really loud and it ussually ends at full crancked volume but then distortion gets annoying and still not what I would call really loud then I back off a bit, and decide its loud enough, and clean but to make it bloddy sceaming loud, you will probably need 100watt minimum and then most likely still loose a good part of the important quality also consider that your room 'distorts' the sound more at louder SPL and speakers distortion rise, both the drivers and crossovers I think its just a bad listening habbit, or a party thing or some strange need to try and impress someone well, just my personal opinion about playing too loud or me getting older still like it loud tho, so its probably good I only have small power amps

25th January 2012, 02:24 AM	#45
ra7 diyAudio Member Join Date: Feb 2009 Blog Entries: 1	People who say the F5 doesn't go loud are either using inefficient speakers or have skipped the preamp. Also, everyone should read the F5 article. It clearly states that it can deliver upto 54W in class AB as the single output device delivers all the current to the load.

25th January 2012, 07:33 AM	#48
ra7 diyAudio Member Join Date: Feb 2009 Blog Entries: 1	"The power of 2.6 amps into 8 ohms is I^2 * R, or 2.6 * 2.6 * 8 = 54 watts. This is the peak value, and the nature of an undistorted sine wave is that the peak wattage is twice the average, so this circuit would operate 27 watts average Class A into 8 ohms. At currents above 2.6 amps one of the transistors will shut off, leaving the other to continue to increase beyond the 2.6 amps in what is known as Class AB." I don't have to say who said that, right?