HU bass and treble settings

[extrarice311]

my current setup : amp JBL gt5 a604, seps JBL GT5 650C, coaxial JBL GT5 652. Im just using the stock hu for this setup. Is setting the treble and bass to max ( +6 in my hu) pushing this setup hard and mag endup mabasag agad speakers ko? Since the speakers are entry level and I dont have subwoofers will playing music make the wear and tear faster? I dont play music too loud ( just at level 12 -15 on my hu)I listen to a lot of rock and electronic music, my car btw is a 2013 honda city.
Follow up question im planning to add a small subwoofer to my setup. Is a 1o inch enough since I really dont like the "bayo" factor. The installer placed the amp under the seats at the back, im also planning on placing the sub there. Is this a good idea? Coz I dont want place it at the trunk.
Thanks for any input on these concerns guys.

[Brent]

Its not a good placement for an amp as it will get hot there due to insufficient ventilation. If you're planning to get only a 10" sub it shouldn't consume much space. Treble and Bass settings don't really push the speakers. It's really the main volume level that pushes the equipment.

[Leo C.]

The body of your amp is not just a case or housing.. it is a heat sink and this requires good ventilation for optimum performance...