F2 or F4 for Alpair 10.2

buzzforb · 28th April 2011, 01:29 AM

I have a problem. I can't seem to stop building audio equipment. It seems the next phase will include Fonken enclosures and either F2 or F4. I have boards for both and was wondering if there is any speicifc experience with MA drivers. I know the Pass/Alpair sound and I love it, so why not try more. Thanks again!

zman01 · 28th April 2011, 03:31 PM

Buzzforb,

I have your problem too

... how to cure?

However limited to speakers till now, amps likely to follow.

Enjoy!

-Zia

buzzforb · 28th April 2011, 03:50 PM

Well, the truth is, I already have a pair of Aleph J monoblocks, just wanting to see if it is worth building one of the two above.

naturallmystic · 28th April 2011, 05:58 PM

There is no cure! The key to surviving this madness is acceptance.

buzzforb · 28th April 2011, 06:15 PM

I just want to accept more.

Scottmoose · 2nd May 2011, 02:07 PM

FWIW, Mark's drivers will recieve little benefit from the F2's current source nature (although you could adjust that in the build); it comes into its own with lower Q units. The F4 would probably be a better bet providing your preamp has sufficient gain. I like both for different reasons, although neither is without its drawbacks.

Oddly, my favourite of all Nelson's free, single gain-stage designs is the Son of Zen (with or without the V6 modifications). It's got a certain something about it.

buzzforb · 2nd May 2011, 04:46 PM

Interesting comment about the SOZ. I think i remeber him saying it was this amp that launched his curiosity in to current drive and the whole dampening thing. It definitely fits the simple build criteria. I have A-J's and they sound great, so this is more about learning and seeing how different things sound. What do you mean by your comment about adjusting the F2. I must admit i don't fully understand. Are you talking dampening factor? I'll do some reading. Thanks!

generg · 14th June 2011, 11:35 AM

I think scottmoose speaks of a low Qt of speakers, means heavily damped. With F1 and F2 Nelson made it possible to drive for instance Lowthers to have a deeper bass, because the current amp delivers more Watt when the impedance rises.
Disadvantage, less damping of the speaker in the bass region. Maybe you must fill in more wool.
I think scottmoose says your speakers maybe not so suited for current amps.

As far as I understand the matter.....

28th April 2011, 01:29 AM	#1
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	F2 or F4 for Alpair 10.2 I have a problem. I can't seem to stop building audio equipment. It seems the next phase will include Fonken enclosures and either F2 or F4. I have boards for both and was wondering if there is any speicifc experience with MA drivers. I know the Pass/Alpair sound and I love it, so why not try more. Thanks again!

14th June 2011, 11:35 AM	#8
generg diyAudio Member Join Date: Jul 2009 Location: Germany	I think scottmoose speaks of a low Qt of speakers, means heavily damped. With F1 and F2 Nelson made it possible to drive for instance Lowthers to have a deeper bass, because the current amp delivers more Watt when the impedance rises. Disadvantage, less damping of the speaker in the bass region. Maybe you must fill in more wool. I think scottmoose says your speakers maybe not so suited for current amps. As far as I understand the matter..... __________________ and the First Wtt is......a really First Class PSS Idea !

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28th April 2011, 03:31 PM	#2
zman01 diyAudio Member Join Date: Feb 2011 Location: Dhaka	Buzzforb, I have your problem too ... how to cure? However limited to speakers till now, amps likely to follow. Enjoy! -Zia

28th April 2011, 03:50 PM	#3
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Well, the truth is, I already have a pair of Aleph J monoblocks, just wanting to see if it is worth building one of the two above.

28th April 2011, 05:58 PM	#4
naturallmystic diyAudio Member Join Date: Jun 2010 Location: Memphis	There is no cure! The key to surviving this madness is acceptance.

28th April 2011, 06:15 PM	#5
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	I just want to accept more.

2nd May 2011, 02:07 PM	#6
Scottmoose diyAudio Member Join Date: Mar 2005 Location: UK	FWIW, Mark's drivers will recieve little benefit from the F2's current source nature (although you could adjust that in the build); it comes into its own with lower Q units. The F4 would probably be a better bet providing your preamp has sufficient gain. I like both for different reasons, although neither is without its drawbacks. Oddly, my favourite of all Nelson's free, single gain-stage designs is the Son of Zen (with or without the V6 modifications). It's got a certain something about it.

2nd May 2011, 04:46 PM	#7
buzzforb diyAudio Member Join Date: Oct 2010 Location: Burlington, NC	Interesting comment about the SOZ. I think i remeber him saying it was this amp that launched his curiosity in to current drive and the whole dampening thing. It definitely fits the simple build criteria. I have A-J's and they sound great, so this is more about learning and seeing how different things sound. What do you mean by your comment about adjusting the F2. I must admit i don't fully understand. Are you talking dampening factor? I'll do some reading. Thanks!

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