F1 and a passive preamp?

[roscoeiii]

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

[Magura]

BoSoZ.



Magura

[Babowana]

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 . . . ?


><

[roscoeiii]

Driving Audio Nirvana Super 12" speakers. Specs here:

http://www.commonsenseaudio.com/an12superspecs.jpg

[Babowana]

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.

><

[Pathmark]

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

[roscoeiii]

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).

[roscoeiii]

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.

[tinitus]

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

[Telstar]

Originally posted by tinitus

Of course that depends also on speaker sensitivity

ditto