The Paper Horn by Inlow Sound

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Bridging the F5 -- a class A dream come true?


Short and sweet, this is my current fantasy, and one I hope to be working on soon.
Nelson Pass' F5 schematic is abundantly available, especially if you go to his Pass DIY website. If you can't find it there, it'll show up at DIY Audio . com. In the meantime, you can observe the basic topology I'm developing and go from there.

The signal splitter in the front end of this creation is from my DIY Class-A amplifier page. I basically use it to convert a single ended input signal into a balanced version and feed this to two F5 mono-block amplifiers.  Use the + output from each amp to drive your speaker (Since this amp doesn't invert the signal, the output with the negative input becomes the negative feed to your speaker). What could be simpler?

The F5 is extremely simple to build and, from what I read, very articulate. It can reproduce complex musical passages with ease -- just read the review on 6 Moons. The best part is that's it's Class A -- that's what clicks my trigger. When bridged, my Simetrix simulator suggests an output of 150 watts into 4 ohms. If this doesn't drive a bass horn, what will? Of course, the load on the power mosfets is a rather high 36 watts (according to Simetrix) and they may have to be paralleled. We'll see.

I'll keep those who find this kinda stuff interesting posted of future progress.
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