Thank you for the kind words about Daqarta. In the past, I've had users tell me that it runs OK under Wine, but I have never gotten into Linux myself.
As far as output boosting, you can use any audio power amp, from a single chip on up to a rack-mount monster. I have one client whose research required long-duration high-level band-limited noise exposures. I set her up with dual "1000 watt" pro-level amps. (Probably putting out more like 100 watts continuous here.)
Best regards,
Bob Masta DAQARTA v5.10 Data AcQuisition And Real-Time Analysis