36 watts at 4 ohms is NOT a lot of power for PA use. and if the speaker you are using is an 8 ohm speaker, your amp will likely only put out 18-20 watts.
I wouldn't use anything less then 100 watts @ 8 ohms for monitor speakers and you will quickly run that out of power too if you are trying to compete with a guitar, bass, drums etc.
For my "Small" PA, i use 4 monitors on stage up front. each is a 15" 2-way box. a woofer and a compression horn. I use a 1800 watt amplifier. 900 watts per channel and each channel runs 2 monitors.
For the FOH, Front of House. I use 2 of those amps. One amp for Subs and one amp for the mains. 5.4 kilowatts total system power.
The monitors are slightly over powered and the FOH is slightly underpowered. But thats what i have for amps at the moment.
Speaker sensitivity is the most important factor if you are going to try and use these amps. you have to find a very very sensitive speaker to get any sort of volume out of these little amps.
Do the math.
If you tried to use car speakers. that say have a sensitivity of 84db for a 1 watt of input. Every time you double the power, you gain 3db. SO
1w = 84db
2w = 87db
4w= 90db
8w = 93db
16w = 96db
32w = 99db max
now lets compare that with a speaker (like some Yamaha SW115V speakers) that have a sensitivity of 99db for a 1 watt input
1w =99db
2w = 102db
4w = 105db
8w = 108db
16w = 111db
32w = 114db max
So you see you have 15db more volume just by using a more sensitive speaker!
Those calculations are for an ideal world and do not take into account power compression and other real world things that happen.
A small amplifier is more likely to distort and cause clipping. Clipping creates heat inside the speaker. heat kills speakers. you can burn out a 100 watt speaker running it on a 10 watt amp with heavy distortion. but you can run a 10 watt speaker on a 100 watt amp all day long as long as you are not physically over driving the speaker.
It is better to have too much power then not enough and 32 watts is NOT enough as you will see it will distort very very quickly.
Is it possible you can bridge the 2 amps together for more power? Might have to build an inverter op-amp board to do it. you might gain a couple more watts.
Most small PA Mixer/Amps have at least 150 watts per amp built in.
Find yourself an old Peavey CS-800. BIG heavy tanks that people will practically give away. 200 watts per channel @ 8 ohms and you can beat the crap out of them day and night. and when not being used for the band, they make great door stops. wheel chocks, jack stands etc.
Very cool you built some amp kits at age 15! keep that up!