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Re: JBL STX and Crown XTiThe spec sheet tells you 1600/3200/6400 LF and 350/700/1400 MHF in biamp mode, so I would suggest 3200 and 700 rated and rms limiter. It is also a good ide to have a clip limiter for the MHF since clipping might overpower the HF in the passively crossed MHF section.
Re: JBL STX and Crown XTi
The spec sheet tells you 1600/3200/6400 LF and 350/700/1400 MHF in biamp mode, so I would suggest 3200 and 700 rated and rms limiter. It is also a good ide to have a clip limiter for the MHF since clipping might overpower the HF in the passively crossed MHF section.