[La Scala Solid Wood Risers???]

If you raise the speaker the woofer has less bass coupling/reinforcement from the floor so you will lose bass no matter what you do with the base.

 

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[what amp for cornwall IV]

35 minutes ago, SpeedLimit said:

is it right the CW IV needs to be placed in corners ?

 

No it does not need to be in a corner. I would say the vast majority of CW's I see over the years are not in corners. Any speaker placed in a room corner vs open wall will have increased bass output in the corner so you just have to consider that for proper balance in the room. 

[Like new Cornwall IV pair for sale, save 2 Grand!]

It seems like the same pair that was listed a couple weeks ago on US Audiomart: 

 

 

[IV Sale: Cornwall IV walnut for $IVk]

I've been keeping my eyes open for a set in cherry but here's one in walnut:  

 

https://www.usaudiomart.com/details/649598459-klipsch-cornwall-iv-pair-walnut/