will this eliminate low frequency buzz?

"Low pass" means that all frequencies below the given frequency (70hz) will pass through. Thus, it will not not eliminate low frequency buzz, especially when LF buzz is often 60Hz. It will eliminate high buzz along with all other signals that are higher than 70Hz.

Does the male end go towards the amp or towards the subwoofer rca? (Powered sub)

I don't think it really matters. If it's inline it will do the job. It was perfect when I needed it, but now that I have a proper sub, it is no longer in the system.

Are these directional ? Should i plug it into the back of my receiver or the back of my sub ?

The answers on this page are correct, but I must add that the slope may not be as sharp as you might expect, so I ended up plugging two in series, which would halve the crossover point, i.e.: two 70's in series yields approx. 40 hz net result with a sharp slope. Two 100 hz units in series gives 50 hz etc. When in doubt, try all possible combinations, say trying a 100 and a 70 in series, use what works best. Good luck.

Can some one please advise me on which one to purchase a 50hz or 70hz? i am receiving slight vocals through my powered sub woofer

human males get as low as 80Hz....... So the 50Hz would produce the required filtering since there will be some variation around the target frequency both filters.

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🎛️ Elevate your sound game with precision that professionals crave!

ULTRA LOW NOISE - Noise and distortion levels so low, they’re practically undetectable—pure audio fidelity.
POWERFUL PERFORMANCE - Handles up to 20 volts RMS, ensuring robust and distortion-free output.
RELIABLE CONNECTIVITY - Gold-plated machined brass RCA jacks deliver superior signal transfer and durability.
ACCURACY YOU CAN TRUST - ±1% accuracy at 22KΩ load guarantees consistent, professional-grade crossover performance.
PRECISION AUDIO CONTROL - Experience razor-sharp 70Hz low pass filtering for crystal-clear sound separation.

The Harrison Labs FMOD Crossover Pair 70 Hz Low Pass is a high-precision audio crossover featuring a 70Hz cutoff frequency with a 12dB slope, capable of handling up to 20 volts RMS. It boasts ultra-low noise and distortion, ±1% accuracy at 22KΩ load, and durable gold-plated machined brass RCA jacks for reliable connectivity.

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