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Old 25th January 2012, 12:59 AM   #41
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Quote:
Originally Posted by KatieandDad View Post
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
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Old 25th January 2012, 01:08 AM   #42
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Originally Posted by KatieandDad View Post

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
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Old 25th January 2012, 01:31 AM   #43
tinitus is offline tinitus  Europe
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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
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Old 25th January 2012, 02:26 AM   #44
ramallo is offline ramallo  Europe
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Quote:
Originally Posted by KatieandDad View Post
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
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Old 25th January 2012, 03:24 AM   #45
ra7 is offline ra7  United States
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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.
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Old 25th January 2012, 06:53 AM   #46
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Originally Posted by ra7 View Post
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
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Old 25th January 2012, 06:57 AM   #47
h_a is offline h_a  Europe
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Quote:
Originally Posted by pdhanwada View Post
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
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Old 25th January 2012, 08:33 AM   #48
ra7 is offline ra7  United States
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"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?
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Old 25th January 2012, 09:29 AM   #49
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Originally Posted by Andersonix View Post
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.
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Old 25th January 2012, 09:32 AM   #50
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Quote:
Originally Posted by ra7 View Post
"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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