If you're building the amp then you can build with your speaker's impedance in mind (increase bias).
I run paralleled New Large Advents (3 ohm dips for sure) with an F6 (1.3A bias)
No problem for that amp.
F5, F6 and M2 give more power into 4 ohms.
The others, less.
All have somewhat more distortion into 4 at a given wattage.
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The others, less.
All have somewhat more distortion into 4 at a given wattage.
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Not a firstwatt amp but Sony Vfet2 is a very good amp for 4 Ohm speakers.
Also Burning Amps with push-pull source follower output.
It will also depend on speaker sensitivity. I have a 4 Ohm speaker that's over 100dB/2.83V. That speaker never sees more than 3V peak. So that speaker is not a problem for virtually any firstwatt amp.
Also Burning Amps with push-pull source follower output.
It will also depend on speaker sensitivity. I have a 4 Ohm speaker that's over 100dB/2.83V. That speaker never sees more than 3V peak. So that speaker is not a problem for virtually any firstwatt amp.
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