TW Acustic three motor unit

In my opinion BN mystery is hidden in copper platter but beside the copper platter four feets instead three, aluminium chassis with only 25 mm thick derlin plintch and three motor unit in one chousing are disputable changes to original AC-3.

I have in my AC battery power supply, BN feets and BN platter and I stuck when tried to add BN motor unit.

Thanks for input. Did you try AC-3 before adding 3 integrated motor unit?

It seems taht spending a big $$$ is not the way to get analog nirvana.
I must say it to my friend who owns TW Black Night and now is considerng purchasing DaVinci Audio Gabriel turntable...

In_shore - can you tell as what TT is so good?

I just returned TW BN 3 motor unit and borrowed three separate AC motors. Will check the effect within few days.

I suppouse that belt tension with one motor is smaller than with three motors. The belt tension with three motors is greater, simply because geometry of three motors around the table. It can be changed to greater tension but not to smaller tension.
So when we compare AC1 vs. AC3 the change in belt tension is inherent with this experiment.

Thanks for clarification. However with AC-3 setup I have a motors as close to the plinch as possible to avoid touching motors to the plinth. So cannot reduce belt tension further using this given belt length.

Downunder. I was always told taht for AC1 and AC3 the belt is the same, however with AC1 we are positioning the motor far apart from plinth and for AC3 as close the plinth as possible, but still can use the same belt.

I have such setup at the moment and the belt is already a bit slippery at running with 20kg BN platter.
Of course we can use the longest belt from BN with AC3, but it is not a default solution. In such setup motors needs to be spaced apart from plinth and the belt would be even more slippery due to less contact area with platter.

According to TW web site, they offers four different belts lengths: 860 mm, 925 mm, 1050 mm and 1360 mm.

1. The belt 860 mm is for Raven GT only where motor pulley is very close to the platter,

2. 925 mm was for old and discontinued Raven One. This belt can be used also with AC1 with motos almost touching the plinth,

3. 1050 mm is default belt for AC1 and AC3 (this is my understanding).

4. 1360 mm is default BN belt. Can be used with AC3 but you need much more space on rack to place motor further apart from plint. I am affraid that this belt would be to slippery witn BN platter I have.

BTW - I can see on the picture of your system that you are using 1050 mm belt with AC3, so the same as mine.