Need a 4 way electronic crossover

I have a 45 year old Sony electronic crossover (model TA-D88B) which has been great and have owned it since 1978 but am having a problem with it now.  In the event I have to replace it can anyone recommend an excellent electronic crossover?  I've seen the Marchand line but it gets mixed reviews.  I need a 4 way system (sub-woofers, woofers, mid high horns, and tweeters).

Thank you for any advice- I did not know where else to post this so put it under amps/preamps.