Can you get decent bass without a SUB?

HKYStormFront

maybe put a thin layer of foam between the z logo and the grille to help insulate it?

if i had a Z, that sounds exactly what setup i would have

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Patrick // 06 Frontier 6spd Nismosis // Mods: Uprev Tuned @ Z1 Motorsports: 257whp & 292 ft lbs
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turbodog

Yeah, I think a local electronics surplus place sells speaker grille foam....

Boxology

Home Depot sells a roll of 1/8th in. thick foam with an adhesive backing. It's around 7 dollars and is in their ac duct isle. Works great and there will be plenty left over use at random, buzzing panels etc.

Asking a 6.5 mid to run into the lower octaves while still being able to faithfully reproduce the signal all the way up to 2K plus the rolloff above the crossover frequency is a tall order. What you gain in the low octaves you would lose in the higher octaves in terms of volume of output of the mids.

A good 4 channel amp for your application will allow you to run the front component speakers with a high pass crossover and the other 2 channels should have a low pass crossover for your sub(s). With a high pass crossover on your front components, you can get them louder overall than without.