A friend has a pair of L-88 woofers and would like me to help him build a 2way diy for fun. I do not want to let the woofer run open like the L-88/100 series but would like to cross it over approx 1500-1800hz. We do not have any measuring equipment and I have searched for a viable crossover ...Troels has 1500 which is unpublished ... Dennis Murphy did a 950 and the S70 Alpha is 1200. The reason for the cut-off desired is that we are going to cross the woofer to a Fountek Pro 5i ribbon tweeter that should not be crossed less than 1500( Stones Audio will help us with the ribbon end).