F4 power amplifier - Page 104

steenoe · 8th August 2007, 03:35 PM

Quote:

Originally posted by mpmarino
Bfish:

D'oh! I didn't think the babelfish was balanced

Hi Russ!

I'm probably in total cranial shutdown but - what is BPA?

oops, found it. It's a chip, right? You know good and well I'm not ready for those yet . I certainly know who to call when I am though

BPA is Bridged-Parallel-Amp.

Printing Russ's schematic right now

Sure looks like a nice gainstage.

apassgear · 8th August 2007, 04:00 PM

Quote:

Originally posted by steenoe
Taking it one step further would be to use the one I posted as woofer amp's, together with a pair of the stock bridged F4's for the fullranger (High/Mid) when the active crossover hits the download area at F-W. Spells powerfull, fully balanced setup
Appealing thought, but maybe 12 channels worth of F4's for a stereoamp is going a bit overboard? (No it aint )

This is the confirmation I was waiting for....Yes, you are NUTZ!

steenoe · 8th August 2007, 04:09 PM

Quote:

Originally posted by apassgear

This is the confirmation I was waiting for....Yes, you are NUTZ!

I wont argue about that

Now that I saw it in print, maybe 12 channels is a bit on the nutty side

I am sure it would make a great amp, though....

Blues · 10th August 2007, 06:15 AM

http://6moons.com/audioreviews/firstwatt6/f4.html

Nelson Pass · 16th August 2007, 08:55 PM

6moons has just posted the rest of the review...

http://6moons.com/audioreviews/firstwatt6/f4.html

apassgear · 16th August 2007, 11:14 PM

Excellent review Nelson, thanks for prompting the link.

I'm still dragging my feet to build the F4 but have most of the components now.

steenoe · 17th August 2007, 05:18 AM

Nelson, congrats on the fine review

Those of us that build and listened to the F4 knew all that

We also knew about the preamps importance with this poweramp

You better build 150 preamps to go with those F4's

(And post the schematic here...he-he)

Steen

chrismercurio · 17th August 2007, 05:23 AM

that the review is not yet complete. I'm sure he will add one or more pages talking about the various ways to implement the F4 and how it performs in these configurations.

It is of course in this early stage an extremely positive review and I look forward to building mine after I acquire a few heatsinks and the rest of the BOM.

C

Blues · 17th August 2007, 05:23 AM

Grrrrreat!

Looks like more to come as that was just the reviewer's first impressions...

spencer · 17th August 2007, 08:56 AM

I am yet to build one more set to try it in balance (100W!) mode to see the difference. Thank you Mr. Pass to share this great design with all of us.

10th August 2007, 06:15 AM	#1034
Blues Lightning In A Bottle diyAudio Member Join Date: Sep 2003 Location: The Milky Way	http://6moons.com/audioreviews/firstwatt6/f4.html __________________ Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html

17th August 2007, 05:23 AM	#1038
chrismercurio diyAudio Member Join Date: Aug 2006 Location: Silicon Valley	I want to mention that the review is not yet complete. I'm sure he will add one or more pages talking about the various ways to implement the F4 and how it performs in these configurations. It is of course in this early stage an extremely positive review and I look forward to building mine after I acquire a few heatsinks and the rest of the BOM. C

17th August 2007, 05:23 AM	#1039
Blues Lightning In A Bottle diyAudio Member Join Date: Sep 2003 Location: The Milky Way	Grrrrreat! Looks like more to come as that was just the reviewer's first impressions... __________________ Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html

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16th August 2007, 08:55 PM	#1035
Nelson Pass The one and only Join Date: Mar 2001	6moons has just posted the rest of the review... http://6moons.com/audioreviews/firstwatt6/f4.html

16th August 2007, 11:14 PM	#1036
apassgear diyAudio Member Join Date: Nov 2002 Location: Viña del Mar, Torreon	Excellent review Nelson, thanks for prompting the link. I'm still dragging my feet to build the F4 but have most of the components now.

17th August 2007, 05:18 AM	#1037
steenoe diyAudio Member Join Date: Mar 2004	Nelson, congrats on the fine review Those of us that build and listened to the F4 knew all that We also knew about the preamps importance with this poweramp You better build 150 preamps to go with those F4's (And post the schematic here...he-he) Steen

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