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That, the LX11 crossover by JBL, is recommended for use with LE10A and LE20 speakers.
If there is an Ohm-age marked next to the speaker terminals, e.g. 4 Ohm, 8 Ohm, then that indicates the 'impedance in Ohms' of the speaker, and for best impedance matching and amplifier compatibility, speakers of similar Ohm rating and speaker outlets on amplifiers of the same Ohm rating, are likely to perform at by far the better quality. (This is called 'impedance matching' and is important: speakers ill matched to the amplifier's output impedance will sound muffled and low-fidelity even with the volume turned up high.)
Theoretically any 8 Ohm -rated tweeter-type speaker will work with it.
But the LE10A and / or the LE20 speakers are recommended.