Do note that the stock radio's DSP has EQ'ed out the low frequencies to match the stock speakers (actually, the DSP is set to protect the stock speakers). So even if you put an LOC+Amp and a sub, it will be very hard to reproduce low frequencies that are being heavily attenuated by the HU.
HOWEVER, there's a hack to temporarily disable the DSP on the stock radio (06-11 Civic and 09-11 Jazz).
Follow these instructions:
1. Make sure that the ignition key is either set to ACC or ON (doesn't matter whether the engine is running or not)
2. Make sure that the radio is OFF
3. Press and hold memory buttons "4" and "6" then power ON the radio
4. Release all buttons and press button "4" once
5. The display will show that the DSP has been turned OFF
6. Turn OFF the radio and turn it back ON
After the power cycle in step 6, you'll notice that the bass and treble frequencies have been extended (flat EQ). However, listening at high volumes may potentially kill the stock speakers so be careful with it.
This setting is temporary and the DSP will default to the ON state the next time the ignition key is switched off.



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