accurate set crossover and subsonic modules,clean sound,solid build,old school quality,24 db crossover and 18 db subsonic slopes

none if used as designed

love the steep 24 db slopes,easy to use,switchable input and grounding options.subsonic filter seems a bit high at 33 hz and 18 db,but sounds wonderful anyhow.will be tryin a 20-25 hz plug soon.i've used this with my two pair of infinity kappa 6.5 inch components and a variety of sub and amp combos for about a year now and am very happy.don't feel the need to replace as long as it keeps kickin and my system layout stays the same.love this thing even though it's 12 years old.if you're system could use this type off x-over and you can find one,i highly recommend.