Having an large subwoofer in the boot means big bass. The bigger the subwoofer in terms of diameter of the cone, the more air it is capable of moving. An 15 inch car subwoofer will play louder and deeper than an 10 inch car subwoofer, if same power is given and similar style of enclosure is used. Most people with kids and an misses don't want to give up boot space and automatically be under the impression that they can't add more bass to there entire car audio system. This is not true. Being an car audio installer at several shops of the years, I have learned a lot.
Underseat subwoofers are an good option if you're limited on space. You simply place it under the seat, its that simple. In terms of wiring them, red 12 volt power, ground black wire, blue remote turn on wire and set of rca cables just like with an normal subwoofer install. They won't provide you with that deep low frequency bass that is in the low 30 to 35 HZ range, but it will provide an nice mid bass kick with some sub bass around the 60 HZ range. This is still good and will make most songs sound bassy. I tend to recommend people to install underseat subwoofers on the passenger seat incase it slides forward. You can use velcro to tape it down or if you want to go the extra mile, you can remove the car seat and screw it down with an bracket of some sort.
Adding 6x9 car speakers to the parcel shelf can also increase bass and with the tweeters they have in the centre also can increase treble. 6X9 speakers are often overlooked in this day an age, but they have an almost equivalent cone area of an 8 inch car subwoofer. Two 6x9 car speakers fitted onto the parcel shelf or even better in small MDF boxes will give you that good bass usually around 45 to 50 Hz . I would say that an good pair of 6x9s will provide better real bass than any old underseat subwoofer if you run them off an external car amplifier.
If you can sacrifice some boot space, then adding an 10 inch car subwoofer into an sealed box will do the trick. It will provide an flat frequency response and will provide an wide range of bass frequencies. Remember sealed boxes can be smaller because they don't need much air space to perform like you see with large ported boxes. Anything around the 300 to 500 rms range would be ideal if you don't want to look into upgraded the stock alternator and battery. As for brands, Alpine is good and so is JBL, both high quality car audio brands that make durable and good sounding speaker products. Kicker and Vibe are also decent too, but they geared towards getting loud than achieving superior sound quality in my opinion.
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