Audio Setup

[AmateurJazz]

In the end it all comes down to personal preference. Vinnie is right about the risk of the bass becoming too boomy with 6x9s and a sub and many will be satisfied with a sub powered from 2 channels bridged. If you're not fussed with the bass then just get a 4 channel amp and power all four speakers, then grab a sub from a shop that is selling u the amp and just try it bridged to see which sound you prefer.

The bass also depends on the quality of ur doors and soundproofing. I've been in volvos where factory sound deadening is top notch and the bass coming out of their stock 6x9s is way better than some accords running 12" subs that forces compressed air into your nose with every bass drum beat.

[AmateurJazz]

why is this?
is it because they dont make as much power or is it because they dont reproduce low frequencies as well as mono blocks?

Quote from vividjazz on ausfit forum:

"Class AB amps are multichannel. They are the ones you use for your stereo speakers.

Class D amps are monoblock. They are made for driving subs (which are mono).

You can use an AB amp to run your sub/s but its much better to use a D amp. Why?

AB amps are about 50% efficient while D amps 90-95%. Monoblocks also offer increased power density, better audio performance, produce less heat and draw less current. Because they produce much less heat, Class D amplifiers can be housed in a much smaller chassis than a Class AB with the same power output. The downside is that the on-off switching of the transistors produces high levels of distortion, particularly in the middle and upper frequencies which is of course not an issue for subs / bass. "

I guess if you imagine the sound produced from mono mode and stereo mode you can tell that monos are designed for low frequency notes due to the power increased density. But however stereo sounds much better with the high pitched notes, which is provided by the AB multichannel amps. You need a combination of both for a balance of good bass and stereo sound.

[micka]

"monoblock" simply refers to 1-channel amplifiers... they are not limited to class d, there are also class AB mono amplifiers.
Stereo (ie left and right channels) is not required for the frequencies w sub will reproduce as human hearing cannot pick left/right with these.
The initial class d amps were only able to reproduce lower frequencies with acceptable amounts of distortion, however there are now some full range class d amps (I believe xtant make one and there are others).