Phono box / subsonic filter

[rares]

Hi !Newbie here.
For now I don’t own a decent integrated Amplifier, just a Sonystr1080 AV Receiver , B&W 606 bookshelf speakers and a Technics sl5 turntable.
When playing digital on the av receiver everything is ok but when playing vinyl I have that subsonic effect on the speakers .
The turntable is connected to the AV receiver using a Pro Ject phono box DC Mm/MC (99$ on Amazon)
Looks like this phono box don’t have a subsonic filter .any recommendations for me? Maybe upgrading the pro ject box to a better phono box with subsonic filter( if amazon will accept my return since I purchase it 4 months ago).
I tried moving the turntable to different location, but same problem.
Phono box connected to receiver using Audioquest cables and speakers to receiver using blue jeans cables
Thanks for your help!

 

[illini]

https://www.kabusa.com/frameset.htm?/rf1.htm

 

[rares]

Thank you!
Will a vintage receiver eliminate the problem or this will persist because of my ported speakers?
If a integrated amplifier will fix the problem I’ll better go that route instead of spending almost 300$ for a phono box+ filter

 

[rares]

I ordered kab filter.
I’ll update after I receive it
Ty

 

[Vinylmasters]

I ordered kab filter.
I’ll update after I receive it
Ty

Same here. Mine's in, just haven't had a chance to hook it up yet.

 

[Vinylmasters]

I ordered kab filter.
I’ll update after I receive it
Ty

UPDATE: Running it through a Sony STR-AV1070 receiver, via a tape loop. Works BETTER than expected! Talked to Kevin at KAB as I had a problem (I thought I was in a tape loop, but it was a DAT loop - oops! lol). He told me I could use the EQ loop on it as well (not sure if yours has that or not, so I thought I'd through it out there anyway).

EDIT TO ADD: Make sure you bypass it when using anything other than the turntable, as it makes the higher end sound a bit *funky*.