Good Questions: How To "Firm Up" a Couch?

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This is NOT Debbie's Couch
Debbie has a question for the crowd: Recently I bought a used couch and loveseat. When we finally moved them in and started using them, we realized they are not as comfortable as we originally thought. I think the springs underneath the cushions are not firm enough, and you end up sinking down too far. Is there a way to "firm up" a used couch? I thought about putting a sheet of plywood under the cushions, but maybe there is some other answer?
(Note: Include a pic of your problem and your question gets posted first. Email questions and pics with QUESTIONS in subject line to: chicago(at)apartmenttherapy(dot)com)
Please share your advice and ideas for Debbie in the comments below...

Photo: Finn Juhl sofa via Retro to Go

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