Placement of compressor in signal chain?

I'd do a search on this, but the search function is down for maintenance....

Here's the rig:

- Preamp (which has an effects loop with a blend control)

- Power amp

- Multieffects (no footswitch) for those times when I need chorus or distortion

- Rackmount compressor

The question:

Where's the best place in the signal chain to put the compressor?

Right now I'm running the bass into the compressor, then into the preamp. The effects box is placed in the loop, mixed about 50%. I've got the output of the box running through half of an A/B footswitch so that I can take it off-line in the middle of a song (the switch just interrupts the signal between the EFX output and the effect return on the preamp).

So, including my current setup, I can:

- Put the compressor between the instrument and the preamp input

- Put the compressor after the preamp and before the power amp

- Put the compressor in the effects loop before the effects box (use the A/B box to bypass the effect when needed... effect send to compressor to A/B input, A side goes to the effect return jack via one half of a Y-connector, B side goes through the effect, then to the other half of the Y-connector... run the blend 100% wet or whatever sounds best

- Put the compressor after the effect... effect send to A/B switch input, A side goes to compressor input through a Y connector, B side goes through the effect to the other side of the Y connector, output of the compressor goes to the effect return jack. Run 100% wet or whatever sounds best.

TIA for any input. I can try to do four crude diagrams to show these if the descriptions aren't clear.

 

Two of these scenarios involve the use of Y connectors at input jacks.

Can any harm come of this??

 

Now that the search function is working again, I found a year-and-a-half old thread in which this question was asked. Predictably, the answers were all over the map.

FWIW, I asked the manufacturer (Presonus) the same question, and they said to put it between the pre and power amp.