winslow said:
The F2 is more SET-like, correct?
I would agree in general that the F2 sounds more like a SET with the following qualification. Yes, that SET like harmonic richness is there. But in addition, with highly transparent speakers, the F2 delivers PRAT. This amp has a 200kHz bandwidth and is plenty fast on my Lowther DX55 speakers.
Fuling said:
Let your speakers decide. F2 is an high output impedance amp, suitable for fullrange drivers in horn enclosures.
Aleph on the other hand is suitable for...everything!
I agree that in the end the speakers decide. Because the F2 is a transconductance amp, its output impedance of 16 ohms may seem high when compared to traditional voltage sourced amps. However, both the F1 and F2 can be used effectively with high sensitivity speakers of any bandwidth. Just as both amps can extend the frequency range of full range drivers by altering their Q, they can also extend the range of other drivers as well. Both amps work well with closed box designs, and by adjusting the input network of Leap 5, I have been able to simulate some promising vented box enclosure designs. The Abbey is an example of a MLTL design that works very well with the F1. Perhaps the limiting factor of the F1 and F2 are their output power (10 and 5 watts) and the need for a serial crossover for multiple driver designs. So I understand your comment that the Aleph is suitable for everything. However, the ablitiy of a transconductance amp to adjust the driver Q is special and very useful for extending low frequency responses.
