How to cut Sub 65 hz from 2way bookshelf speakers

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I need some help. I made a great set of bookshelfs for my my sister. She wanted something small and easy to use. Ended up running across a factory sealed set of raidho D2 tweeters and some factory old stock prototype AUDAX 4.5" 8ohm x 8ohm mid/bass drivers. She isn't into the thump. Anyway crossed over 2nd order at 2500hz sealed box, but the small woofer just wrecks the sound when trying to punch out sub 50 hz. Is there a simple fix to put a passive HPF that starts to roll off hard say about 65-70 hz. I have them hooked up to a a 2x80w mini amp that has Bluetooth to make it easy so no go with a quick AVR settings change. I love cheap and easy fixes I am not a master of designing crossovers but if any one could give me an easy basic idea pretty good with the hot iron so hopefully I can knock this little set back out and get her up and going.
 
Adding an input capacitor to the amplifier will give you a first-order rolloff, but I'm not sure how easy that'd be given that it has multiple inputs.

How loud is it when the drivers start to struggle? If its only going to be used for background music, I wouldn't panic.

Chris
 
Well just depends. Some apps like MOG AND BEATS run really high bass boost and don't have an EQ and I am a bit picky. Don't like my name on a sub par anything. Could I just make a straight 65 hz HPF and throw it between the terminal cup and my main crossover?
 
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