Do I need anything additional to my setup for my pro-ject debut 3 turntable?

Since the Bel Canto has limited preamp capabilities, what you need is either:

     1.  A preamp with built in PHONO pre (similar to what the Marantz has) or

     2.  A preamp and a separate, standalone Phono preamp

You can still use the Bel Canto DAC 3 as a DAC feeding into the "new" preamp.  (just set the switch on the back to 'fixed' which will set the output of the Bel Canto to maximum).  Then the outputs of the "new" preamp will go to the inputs of the MC402.

Do NOT hook up anything into RCA or Balanced inputs of the MC402 that does not have a volume control.  (that includes the BelCanto DAC 3 with the output button set to 'fixed'.)  The signal will come out of the amp at full volume and your speakers will most likely be blown.  Looks like you got lucky that the output of the turntable cartridge is so low that it wasn't enough of a signal for the MC402 to amplify.

By the way, do you know the make/model of the cartridge on the turntable.  That will have a bearing on what kind of Phono preamp is needed.  (Moving Magnet or Moving Coil).

- Jeff

If the Marantz has a pre-out you could use it as a line/phono preamplifier into the Mac power amp (connect the TT to phono and the DAC to a line input).

If it does nor have pre-out you might be able to add an inexpensive preamp (fed by the tape-out of the Marantz and then connected to the power amp).

Not ideal, but it would get you going (here's an inexpensive $50 preamp with two pairs of RCA inputs).

https://www.schiit.com/products/sys

DeKay

Thanks so if I prefer to keep my marantz separate what is a good preamp with phono option that is relatively compact? Flexible on price if necessary thank you!

The Marantz doesn't have preamp outs, so no joy there.  And trying to use the tape outs is just asking for making things messy.  

When you say flexable, what does that mean.  $100, $1000, $5000???

Also, what speakers are you using?  And what interconnects and speaker cabling? All will have an impact on what would be approperiate for your system.  The McIntosh MC402 is a very nice amp which seems to routinely sells for $4500 to $5500 used.

- Jeff

It’s connected to b&w 801 d4 signatures. I dont have a budget limit for the preamp but it’s a cheap turntable so I don’t really need anything that fancy despite the rest of the setup, mainly just to listen to the turntable on it. focusing on simple and small that will allow me to connect