Help wanted for Le Monstre mod to 20W

[bak]

Hello to everybody , after setting a MONSTER power supply for the original schema i would like use it for a second pair of BASS dedicated circuit.

I need help and suggestion about what and how modify on the original schema in order to have ( using the same input and drive component and simple circuit) a power section able to obtai 20W / 8 ohm if necessary in AB class .

Thanks for your help and suggestion

[WuYit]

Hi,
what parts are you having on hand? A separate (dual-mono) power supply and raising the voltage would be beneficial. I`m not saying this is a bad idea, but the output compound does not like working in class AB.

[tiefbassuebertr]

Originally Posted by bak

Hello to everybody , after setting a MONSTER power supply for the original schema i would like use it for a second pair of BASS dedicated circuit.

I need help and suggestion about what and how modify on the original schema in order to have ( using the same input and drive component and simple circuit) a power section able to obtai 20W / 8 ohm if necessary in AB class .
Thanks for your help and suggestion

What means "BASS dedicated" ? Please let me know the bandwide resp. turnover frequency to the midrange.
Below approximately 200HZ until 500 Hz and steep at least 24 db/oct high quiescent current through the output power stage isn't necessary (Class AB with 30 mA is enough without disadvantages). When only two way system is in use with turnover frequency above 500 Hz (e. g. between 1500Hz and 5000 Hz), then you need Class A in all cases, but not necessarily more power output.

For give you more exactly hints, we need the types/models of your loudspeaker driver chassis (transducers) and your crossover network schema.

[bak]

The power supply i have is a regulated one and followed by L C L C almost 3 farad Capacitance and with 250uF every rail for every channel of MKP capacitance.
I want make a 3 way system with Altec 420A ( 38cm in 120litres closed enclosure) until 350 Hz , Altec 421A at dipole from 350 until 2500 Hz and finally Ess AMT1 ribbon tweeter from 2500 to the high end frequency. For the mid and the tweeters i want use the simple 8W schema , for the bass until 350 i think more power and even class AB could be a benefit. This must use the same 12V pos and neg of the original schema. I am expecting help to set up a double set of final transistors with relative change of the idle current. Thanks for your help .

[WuYit]

bak,
you are about to create a really nice system, much better than average. Again, paralleled output devices and class AB operation are not ideal for the CFP.