Originally Posted by
Ian Mackenzie
On the 4343 l recall it was discussed but l don’t have the official updated parts list or any updates to the pcb.
I attached the above 4315 schematics for illustration purposes to identify the parts l referred to in my post. For an equivalent network those parts in the 4315 are required. They are after the L pads and ensures the network functions correctly when connected to the actual loudspeaker drivers.
Feedback and Recommendations.
1. I would also suggest a pcb revision so the cabling for the drivers coming from the pcb and not the L pad tab 1 and tab 2.
2. Secondly, l would recommend the pcbs be provided with quality pre soldered crimp style tab terminals and a labeled crimp connector cable loom for connection to the L pads and from the pcb to the mid, horn and 2405 drivers.
That way testing and disconnection of the pcb and the L pads is much easier for the constructor. Alternatively screw type terminals with spade terminals. It needs to be idiot proof so that incorrect connections by the constructor are eliminated. Labelling of supplied cables with a label maker would make it much for the constructor during installation of the crossover.
You don’t want to be looking back and forth to the instructions when installing the crossover, the cabling and the L pads.
This would make it much simpler for the constructor to wire up the L pads and connect the drivers to the pcb using quality crimp connectors (if my understanding of pcb is correct).
3A. Thirdly, on the size of the pcb to fit inside of the enclosures the final equivalent 4344 networks were assembled with the horn and uhf filters stacked above the mid filter board on nylon stand offs. It might not look as pretty but it’s a better approach. The two split pcbs could still be used for an external crossover network. The point is the constructor is not mandated into an external crossover implementation which will not suit all situations.
3B. For illustration in attached image is a HF & UHF filter boards below where l used nylon spacers with brass M5 screw threads as l recall. The mid filter board was mounted on top. Some cable strain relief ensures the integrity of all cable connections to the board.
More of an option but the pcb could be set up for bi or tri wiring back to the power amp. I didn’t to that in the build below but you can see an effective star ground snake to ensure currents in the filters don’t migrate into the ground.
This was a conventional network for JBL 4344mk2 clone build in Europe.
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