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marktd 27th September 2012 07:07 PM

Would an F3 clone drive LS 3/5 a clones ok?
Thanks for any input. I want to build some kind of single ended class a amp.

marktd 27th September 2012 07:13 PM

Would the BA1 work?

Zen Mod 27th September 2012 07:23 PM

both will work

BA1 certainly louder , but LS3/5 isn't made for drag races anyway

marktd 1st October 2012 03:30 PM

Thanks. I think I'll plan on building an F3.

juma 1st October 2012 04:08 PM


Originally Posted by marktd (
Thanks. I think I'll plan on building an F3.

Think carefully.
Impedance of LS3/5a is nominally 16Ohms (10 Ohms from 1989 onward). Sensitivity is very low (82dB/W/m) and the F3 is a gentle amp - it will drive the LS3/5a with 10 - 17W (depending on your speakers' impedance) which might be fine if you are OK with low to mid sound pressure levels or near field listening. F3 was conceived with high sensitivity, easy-to drive (full range) , speakers in mind...

Some data:
BBC LS3/5a loudspeaker BBC LS3/5a Specifications |

marktd 4th October 2012 02:23 AM

I appreciate your input. I am building Jeff Bagby"s Continuum speakers which are 8 ohms and 83.5dB. I am in a small space. I was really impressed by the Six Moons review of the F3. I haven't a sense of whether the BA 1 or 3 would be nearly as good. I would build a BA3 if it will sound as good. I'd rather listen to the F3 at low volume if it is much better.

AudioSan 4th October 2012 03:57 AM

83.5db???? thats not a class A match at all!!
unless your maximum listening level is 90-95db peak.

Nelson Pass 4th October 2012 09:03 PM

That's about my maximum listening level - 2 watts peak into 92 dB Lowthers.

Unless I'm drinking....


sandyhooker 4th October 2012 09:41 PM


marktd 5th October 2012 12:31 PM

Wow! I'm going to go with my first inclination and start gathering parts for an F3 build. If it isn't loud enough, or I take up drinking, I've got my old Amber Series 70 in storage.

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