It is retailing with 5 sets, but can not we retail 20 sets / 40 sets? Even if you connect + and -, you can connect two sets, but one set is halfway to the rest. I want you to sell even numbers at least.
In addition to speaker wiring, automobile coupler terminal may be suitable for this type, so you can plug it directly. This is convenient when it is a direct coupler from the base, when it can not be repaired by Giboshi terminal.