Will this amp trick work for increasing bass performance?

I have to chime in here. Paul McCowen from PS Audio said the best way to connect your subs was to connect them directly from the speakers to the high level inputs on the sub. (he has a video on the topic) In this way it picks up the dynamic characteristic of the amp. Connecting straight from the pre-amp is passive.

The result of this change was nothing short of amazing. For so many years I had my subs connected 'passively' to pre-amp. This change has added dynamic 'punch' and tightness like I've never had before. I now pick up the punchy personality of the amplifier. Not more bass but tighter bass. Exactly what I had been searching for over many years. Bass you can feel. Provided your sub can accept high level input connection this is a game changer. It's a simple, cheap connection taking a few minutes to change and the results are huge!!

I have two 12" inch subs in stereo connected directly to my McCormack amp and my search for better bass has ended thanks to Pauls simple trick. Makes me wonder why the entire industry suggests connecting to the pre-amp. 

Tidal question... from what device are you streaming from? How is the connection made?

Yes, provided you have 'high level input' connection on your subs. Most higher quality subs have two ways you can connect. Either 'low level' RCA connection from your pre-amp (passive) OR you can run a short set of wire directly from the back of your speaker connection to the 'high level' input on the sub woofer. 

Super easy to do provided you have 'high level' inputs.

The reason I ask about Tidal is that some people connect from the TV app. This method gives you low resolution and very reduced dynamics.
Your connection seems to be fine.

FYI... Paul McGowen just posted another video explanation of the importance of the subwoofer and the importance of the connection to the 'high level input' of a quality sub. 
https://www.youtube.com/watch?v=7PIoSbboDf0

One other very important point...finding the best bass is also extremely dependent on the location off the bass driver in the room as well as the phase adjustment of the bass speakers. The room has bass cancellations and that you can't eliminate. However these cancellations are movable especially at the listening area and it must be corrected for optimum sound.

Once again the advantage to a movable pair of subwoofers is the only way to go if you're looking for exceptional sound. Once positioned in the best 'location' for your particular room, then they are individually 'tuned' by way of phase adjustment to help eliminate (minimize) any cancellation occurring at the sweet spot.

There will always be wave cancellation in a room. It needs to be dealt with. Stationary speakers in a set location unfortunately give the least amount of options for correction of these dead zones. You can NOT power or EQ your way out of wave cancellation.

The best sound is not achieved by placing the speakers in the most visually appealing room location. It just doesn't work that way. Physics rules.