NA 328 Boards -Where Do They Go?

When looking at the preamp from the front are they closer to the middle or are they on the right?

Hello?

Haven't a clue I am afraid... if Richard Dane or anyone else doesn't chime in - I guess its a call to Naim support

Richard. Please. There are 4 slots and we know the phonoboards take 2. But which do I use for the 328s? 

Got it. they go next to the 325s.

They go where the Phono boards would fit - If looking from the rear then you can trace the grey wires from the two pairs of phono input BNCs to where the two pairs of phono boards can be fitted.

In the picture above you can see phono boards fitted in one input alongside a pair of link boards in the other.

However, I wouldn't bother with NA328 boards.  They're not needed these days. Better to use NA326 link boards.

I put my 328s where the 326s are. Is that ok?

Better to put the NA326 boards where the NA328s are.

I like the sound of the 328s. They  take away some of the treble...

I dont have 326s. Should I search?

NA328s have their uses - particularly in the way that they can make a poor sounding digital source sound a bit more palatable.  But they're not substitute for upping the quality of the source.