Added more low end thump...

[07sportm35]

I have the 8 speaker Bose system which I consider to be decent. It is however begging for more low end thump to complete the full audio spectrum. Nothing crazy, just some clean sub 40Hz performance.

I threw in a Polk 12" sealed subwoofer-a deep clean, efficient sub.

I complemented that with a 300 watt rms "D" class kenwood amplifier.

I ran a bass control knob to a invisible but easy access position in front of the drivers position underneath the dash.

Night and day in terms of overall enjoyment of classical to hiphop music.

Like Jennifer lopez, I now have junk in the trunk...

[07sportm35]

I am thinking about lowering the amp so I can hide the wires.

The height of the box is 16 inches. I built it that way so the sub would "squeeze" into the back of the trunk and be held from any movement by the trunk itself. I also put quick disconnects on the woofers speaker wires to the amp. Worked out perfectly. The sub is easily and quickly removable but stays put.

[Alphax]

Did you tap into the rears for the inputs or how to you hookup the amp?

[maxnix]

Monophonic bass for stereophonic classical music? I think not!

[07sportm35]

Monophonic bass for stereophonic classical music? I think not!

Get a life...

[fiveliterbeater]

Monophonic bass for stereophonic classical music? I think not!

what the heck is monophonic bass? i thought there was just bass. now there is monophonic bass?

[07sportm35]

what the heck is monophonic bass? i thought there was just bass. now there is monophonic bass?

LOL it's more like moronphonic...

Here ya go according to "high end audiophiles" (in a home mind you where it might be possible).In a car forget it. A car is to small.

Less “stereo” bass. This is far less valid a concern than most would think, but it may be a valid gripe IF you’ve got some media content with real “stereo” low frequency information, most likely phase difference between channels as opposed to level differences. However, unless a particular source was recorded with substantially spaced microphones (10-20 feet, for example) and the recording engineer actually took efforts to keep that low-frequency information discrete (not summed to a single channel, which is itself a common practice for low bass) all the way through the mixing, and then the mastering process, those phase differences will be lost, and simply result in amplitude changes. For the few recordings that may actually have directional low-frequency content, such as fringe audiophile labels like Chesky, you can conceivably benefit from “stereo” bass IF you put subwoofers or your full-range speakers on different sides of a large room, allowing the phase differences from different directions to lend a sense of space reflecting the size of the original venue, which may be of use if 1.) there was a real venue, meaning it wasn’t recorded in a recording studio, and 2.) the venue was large enough to benefit from a sense of space, for instance a large concert hall or cathedral. Then again, simply having the full extent of low frequency content, stereo or not, can impart much of the same sensation. For those of whom for which this rare scenario makes stereo bass worth it, the scenario of a subwoofer for each channel might be worthwhile, despite the inevitable, and in my opinion, more substantial drawbacks.

[07sportm35]

I'm a Microwave engineer but I happen to know a lot about audio frequencies(20-20KHz). Also have dabbled in car audio.

You see the human ear has a very difficult time discerning the direction of low frequencies-generally below 60Hz. Because of that reason in home theater it's not very important where you place the subwoofer. Subwoofers generally deal with 20-60Hz.

In car audio you hear the term "bass in the back" syndrome. This is usually associated with your bass in the back overpoweriing your front speakers. When your front speakers have weak midbass it exacerbates this syndrome. This is probably the most difficult thing in car audio(midbass).

Never in the history of high end car audio life (until now)has anybody ever been concerned with stereo bass for obvious reasons. The car is about 8 feet wide. Furthermore, there are very, very few recordings that support it anyway(like maybe 50 songs in the history of mankind).

Maxnix is a very funny guy.

[SteveTheTech]

You see the human ear has a very difficult time discerning the direction of low frequencies-generally below 60Hz. Because of that reason in home theater it's not very important where you place the subwoofer. Subwoofers generally deal with 20-60Hz.

That makes complete sense. If the gain levels are set more on the lower side to aide the rest of the stereo and not just rattle your intestines around than the effect of more depth is a great addition. An overhaul of the system in the M is a surprising challenge given the complexity of the interface with the bose amp especially on advanced tech models.

Directionality over 60Hz makes a world of difference but centering the lowest frequencies and using the correct box for the interior volume will yield impressive results. With some sound insulation in the cabin of the M, a little more than was originally added will keep all the sound waves inside the car. Using a sound processor will take you to a whole new level.

I had to lol a little at maxnixs mudslinging. How long did it take you to find something to disagree with in this thread. You never fail to wetblanket every thread in every forum.