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Old 12th April 2009, 01:35 AM   #1
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Default F1 and a passive preamp?

Hi folks,

I'm still trying to get my head wrapped around the unique characteristics of the current source F1. Since I've settled on the F1, I am trying to figure out what the best pre-amp match would be for it. The B-1 is getting a lot of attention here, and has gotten me thinking about the possibility of a passive pre with the F1.

Anyone using a set-up with the F1 and a passive pre? Or does the F1 need an active pre which can provide some gain? Any thoughts, comments or recommendations are most welcome.

I may try a DIY preamp once my DIY F1 is done, but I'm also looking at pre-amps such as the Audio Alchemy DLC, NuForce P-8 and Papa's GFP-750 (which has an active-passive gain switch).

-Roscoe
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Old 12th April 2009, 01:50 AM   #2
Magura is offline Magura  Denmark
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BoSoZ.



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Old 12th April 2009, 04:09 AM   #3
Formerly "jh6you". R.I.P.
 
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Default Re: F1 and a passive preamp?

Quote:
Originally posted by roscoeiii

Anyone using a set-up with the F1 and a passive pre? Or does the F1 need an active pre which can provide some gain? Any thoughts, comments or recommendations are most welcome.


I think it would depend on the sound pressure level of your speakers. Which speakers you are going to drive . . . ?


><
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Old 12th April 2009, 07:51 AM   #4
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Driving Audio Nirvana Super 12" speakers. Specs here:

http://www.commonsenseaudio.com/an12superspecs.jpg
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Old 12th April 2009, 09:12 AM   #5
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Quote:
Originally posted by roscoeiii

Audio Nirvana Super 12" speakers


95dB full range?
As F1 gives 14dB gain (I have once built), I would highly recommend B1, with respect to the sound quality at good enough sound level.

><
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Old 13th April 2009, 01:11 AM   #6
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Default B1/F1

Roscoe..

My current setup.... SB3 --> B1 --> F1 --> Fonkens (Fostex 127) and more than enough gain. I still have not gone past 12 o'clock.

Oh yeah and the sound......loving it...only another 100GB of music to listen to!

Pathmark
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Old 13th April 2009, 03:41 PM   #7
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Default preamp output impedance & F1 input impedance

The B1 has certainly caught my attention. Reading up on how it affects the impedance has left me with the following question: What is the ideal output impedance for an F1? F1 has an input impedance of 100 KOhms balanced and 50 KOhms unbalanced.


Just a noob trying to figure it all out and wrap my head around all the goodies discussed here (with good music on in the background, of course).
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Old 15th April 2009, 09:36 PM   #8
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Just read this in the Enjoy the Music review of the F1:

"Keep in mind that the F1 sports a rather low input sensitivity and needs to be driven by a preamplifier with at least 10dB of gain."

Thoughts on this? Any one else find this to be true?

Looks like I may have a chance to compare active and passive with a GFP-750, which I will also be able to compare to a DIY Bride of Zen. I believe that the GFP-750 layout is from Papa's Bride of Son of Zen (BoSoZ), which Papa says he prefers to the BoZ.
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Old 16th April 2009, 12:08 AM   #9
tinitus is offline tinitus  Europe
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Quote:
Originally posted by roscoeiii


"Keep in mind that the F1 sports a rather low input sensitivity and needs to be driven by a preamplifier with at least 10dB of gain."

Thoughts on this? Any one else find this to be true?


Ofcourse that depends also on speaker sensitivity
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Old 20th April 2009, 10:15 AM   #10
Telstar is offline Telstar  Italy
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Quote:
Originally posted by tinitus

Of course that depends also on speaker sensitivity
ditto
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