| Yes, in the trunk..   Depending on on how well the intererior of your car is sound/weather-proofed, the bass can be heard from inside.. 
 ex:
 1- 92 sentra coupe (1 10" 300w rms)
 2- 2002 Accord coupe (2 12" 600w rms)
 Both system have very good installs.  With the seats, the sentra's interior is getting more bass (even though it only has 1/2 the power).. But with the seates down/off, the Accord obviously buries the sentra..
 
 In your case, the sound/weather-proofing wont do that much dammage.. So even with your seats up, you'll be getting a lot of whats being played.
 
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