Signal Splitter

[audioguru]

You smelled something burning?
The little 2N4401 and 2N4403 have an absolute max allowed heat dissipation of only 625mW. In a 9W amplifier each one must dissipate 3W at full output. They will fry.
The simulation software doesn't know that.

The little transistors have a max allowed current of only 600mA. At 9W into an 8 ohm speaker the peak current is 1.5A. Bridged it will be 3A. They will fry.
The sim software also doesn't know that.

You need to use power transistors like the TIP31 and TIP32 mounted on a heatsink. But their current gain is much lower than little transistors so the circuit needs additional transistors added.
Use Sziklai pairs (look in Google) for high linear current gain.

The "bias servo" transistor needs to be mounted on the same heatsink as the output transistors so it can compensate their current for changes in their temperature.

 

[catcat]

You smelled something burning?
The little 2N4401 and 2N4403 have an absolute max allowed heat dissipation of only 625mW. In a 9W amplifier each one must dissipate 3W at full output. They will fry.
The simulation software doesn't know that.

The little transistors have a max allowed current of only 600mA. At 9W into an 8 ohm speaker the peak current is 1.5A. Bridged it will be 3A. They will fry.
The sim software also doesn't know that.

You need to use power transistors like the TIP31 and TIP32 mounted on a heatsink. But their current gain is much lower than little transistors so the circuit needs additional transistors added.
Use Sziklai pairs (look in Google) for high linear current gain.

The "bias servo" transistor needs to be mounted on the same heatsink as the output transistors so it can compensate their current for changes in their temperature.

I used 125w power transistors in the real version, and a 4011 for the Vbe multiplier.

Yesterday I spent the day making a "crude" mosfet amp with complementary mosfet output stages, mosfet voltage/input stage, negative feedback, and bootstrapping; and it probably sounded better than anything I ever herd, despite the slightly low volume. It uses a single-polarity 12v supply.

 

[audioguru]

Your Moset amp's voltage divider of the 10M resistor feeding less than 300 ohms eliminates any negative feedback.
EDIT: Its tiny 220uF output capacitor cuts 91Hz to half power and cuts lower frequencies much more.

Here is a pretty good very simple Mosfet amplifier.

 

[catcat]

I started this thread for the phase splitter, now I need itmore that I can make the rest of it.

 

[Nigel Goodwin]

No point in a phase splitter if you don't have any amps?, and you haven't shown anything that looks like an amp yet - you also don't need a phase splitter, if you design your amps to be bridged.