Your amplifier looks like the AudioSource amplifier but it's A LOT less expensive- in theory, it could work but you need to show how you ran the speaker wires. If it's less than half of the AudioSource amp's price, there's a reason and it's likely that any corners they cut had to do with its power supply and that's not a good thing.
**********Did you home run all of them (each zone's wires go from the amplifiers to the volume controls before going to the speakers for each control), or daisy-chain (run cable from the amps to a control and connect the next zone's input cable parallel to the feed)?
(I'm assuming the amp used for 3 pairs is blowing the fuse- am I correct?)
Did you set the impedance switch correctly for the 4th and 5th pairs?
Did you measure the resistance on the speaker wires AT the amplifier, BEFORE connecting them?
Did you have adequate lighting, to see which connections you were using for the Amp and Speaker connections on the controls? When in a hurry or in low light, reversing these can happen.
Disconnect the speaker wires from the amplifier that's having problems. Turn it on and if it stops blowing the fuse, you have a wiring problem and in that case, you need to measure the resistance on the speaker wires.
Where did you buy the amplifiers? If they have a multi-channel amplifier like the one in the link, consider using that, rather than two separate amplifiers. I have used them and they work. Auto-turn on, separate channels for each zone, bridgeable, groupable (switches on the back for main bus line 1/line 2 or separate line in for each channel) and each zone will turn on only when it receives input, which makes using more than one Sonos (or whatever you end up using for streaming) for each zone possible without needing to change anything, other than grouping the streaming devices.
This amplifier will also allow you to bridge two channels to one, so if you have one pair of speakers that need to cover a larger area/play louder, you would create two channels from four, but connect two speakers with each amplifier channel delivering about 80W instead of 40W.
Read the info about using in-wall volume controls- it would apply to the Pyle amplifiers or any other brand.
MA1240a Multi-Zone 12 Channel Amplifier
www.daytonaudio.com
*****Measure the resistance at the input of each volume control without any connection to the amplifier- if you see less than 6 Ohms, you would need to disconnect the speakers and re-measure.
The reason for measuring the resistance to the control's input is from personal experience- I received a message from a customer whose receiver went into protection and disconnecting all of the speaker wires didn't help. When I measured the resistance to the volume controls, I found that the one for the kitchen showed .6 Ohms on one channel and that caused the amplifier to fail. The control was very similar to yours, other than the impedance switch. I replaced it and had the receiver repaired, but I measured the resistance before making connections to the receiver because I didn't want to repeat the failure.
IF you need to connect two pairs of speakers to one volume control or two controls to one cable from the amplifier, make sure to set the impedance switch correctly- this is critical.