I have read many articles about dust collection and the differences between a shop vac and a dust collector. I am still stuck on one major issue for me; how does one connect table saw, mitre saw, router table to a 4" dust collector when all their ports are 2 1/2"? My understanding is that the reductions severely inhibit the dust collectors ability (which was also my experience as I tried it). I switched to my 6.5 hp shop vac but it cannot handle more than one or two at a time at best and when I add a dust deputy into the mix, everything gets worse. Would really appreciate some direction. Thank you
There are many adapters and reducers available for dust collection hoses and fittings.
Here is a link to one: 4 to 2 1/2 reducer.
Will the reduction reduce the ability of the dust collector? Sure, but it's still doing a better job than the shop vac. And most can handle running multiple tools at the same time.
The advantage of the dust collector vs. a shop vac is in CFM, or how much air it can suck/cycle. If you look at a 2hp dust collector, the CFM will be around 1500cfm vs. a 6hp shop vac around 180cfm. That's moving a lot more air.
With my table saw, I have a dust collector hooked to the back port and an additional over the blade suction. Removes most of the dust.