Best crossover frequency when bi-amp


How do you determine the best crossover frequency to use when bi-amping speakers (no specs available)?
ryllau
Thanks for your valuable input, Massvm. I'm toying with a pair of very old JBL horn speakers. Don't even have the model number.
Ryllau, JBL maintains a pretty good database of vintage equipment at their website. I wouldn't discount doing some wandering about to see if you find something there. You may even try contacting them with a digital photo attached. Worth a shot.