Thread: Woofer Position Question(update-new problems/ideas)

Originally Posted by GTPSHAWTY

well my input.. the speaker shouldnt be switched around unless its a free air type of speaker... and as far as the bass knob... just set ya bass where you want it... and leave it alone.. moving it up and down will eventually short out the amp sooner or later... get an eq for all that... you will be much more satisfied

The voice coil is still dealing with back pressure from the box since the cone is still attached to it's air space/receiving back pressure. So it really isn't like dealing with IB in any way shape or form.

Inverting the speaker is changing the phase 180 degrees WITHOUT adding any "delay". If you flip polarity on the sub then you change the signal 180 degrees AND delay by one wave length. It's easier to demonstrate than talk about.

Originally Posted by dpzelenak

i want i knob to control it,
i use it everyday, some songs i want massive bass and other i dont and everything in between
so i need one
i have had the same set up for 4 years and everything still works and sounds like new
only problem ive had is the bass knob thingy
couple questions
how do you know if the HU has sub control?
my box is big and open and 1' thick mdf so what does it matter if one sub is out and the other is in?

Technically speaking, the kick of bass is determined by your mid speaker and how well it matches up with the sub. That means install and tuning are paramount! You can EQ your tweeter and change the sound of "bass"

Go to an audio competition and listen to different setups. Notice their mid configuration in comparison to subs.

yes^
i can change all that in my HU but its easier and more convenient just to control it with the knob
my sub level on the HU goes from -6 to +6 and i was told to put it at -6 my the shop i go to but i didnt like that so its at +4 now
this is was my amp says(settings on the side)(easier just to post a pic)

the gain is just both max and the low pass is at 50hz and where it says remote is where the knob goes

turn ya amp off full it will keep trying to throw words out the woofers.. will also mess them up too.. put it on lph... and feel more bass

ive been tryin to figure that out for years, the shop that installed it setting it like that and the only setting ive changed is the gain

dam... everytime i buy somethin.. ill sit and play with every feature to learn it... but flip the switch and see what you get.. then mess with the gain.... and the low pass knob

so do i, but i was 15 when i got it and my dad paid for it and i didnt want to **** it up,
imm flip it when i get it hooked up, my speaker wire is to short to go around the box so i had to fix that first

o ok...just post on here the difference when its done

got everything hooked back up and flipped the X-over to lph so will see.

Flip phase to 0.

Set LPF to ~80hz. Then try ~120hz.

Inside the box...does each speaker have it's own chamber? Or do they share common air space? Flip the + and - wires on one of those subs if they share common air space.




Shared/common air space(disregard the port)



Separate chambers/air space(disregard the port)

i myself have 3 12's in a shared airspace and it sounds dam good...

Originally Posted by GTPSHAWTY

i myself have 3 12's in a shared airspace and it sounds dam good...

The issue is with polarity. As far as I'm concerned I'd rather have separate chambers for all of my speakers.

Panasonic hu memphis xover 1500d quantum monoblock amp.... two offbrand autotek 12s and one ragedy punch 12 all is hooked up + to + and - to -

This might be harsh but I'm not examining your setup. If you like your sound, that's great, but that's not the topic at hand.

If this kid has two woofers sharing common air space but facing different directions it's necessary to reverse polarity before something is damaged because he can't "hear" anything due to the cancellation. Next thing you know...gain goes up, bass boost goes up...BOOM!!!!

Honestly, even if they do maintain separate chambers there's probably cancellation. They need to play together, not AGAINST each other.

Just get a DD9512, or a Sundown nightshade. All you need is one to get you near 150db!

when i hear this problem i usually tell ppl to go thru their wiring.... and make sure NOTHING is backwards.. second i say look at the amp and make sure its on lph.... check ya wires.. if you got over 1000 watt setup get thicker wire.. for better crisp sound.. idk about all that im just a backwoods music guy.. im not with crossin or reversing nothing lol just hwo i am

I understand...I'm a very methodical person. I try to take into consideration the science as well as the fact that there isn't any real way to guesstimate what will happen.

Car audio is one big guess. But I certainly understand cause and effect in this specific matter. Since most people don't have any idea what they're hearing anyways, they don't notice cancellation, second and third order harmonic distortion, etc, etc. Even if they do notice it and it's technically bad...they usually think it's "good" just because it sounds different. But in the end if they're happy it doesn't matter!! So I pick and choose when I chime in. I see this as a potential bad circumstance for the op that I'd like to help him avoid.

I just like to try and educate those who have questions. Your opinions are definitely welcome and thanks for chiming in! Hope I don't seem like too much of an ass D:

Originally Posted by I800C0LLECT

Hope I don't seem like too much of an ass D:

nope you didnt just taught me things i didnt know

Another great site is Car Alarm, Car Stereo, Mobile Video, and Cruise Control Info for Installers. I think that's it anyways... I learned a lot about wiring, phasing, the works... If you have a little time to read, check it out.