ANeonRider

Why not port to the cabin? Not enough space for the port to fit? You do have the space between the box and the rear deck, and well as the height of the box to fit the port...

Here is what to do: If they are amp powered: Disconnect the RCA's from the amp... Noise still there? It is the amp ground that needs to be fixed, or a speaker wire is bad.. If the noise disappears, then you need to fix the HU ground, or have bad RCA's. If the speakers are deck powered, then only a cpl things could be wrong, speaker cables, or HU ground.

OR... nearest size to that. And yes, aeroports need to be longer... ~ 1" longer.

Yes, you are correct about the 2-18" ports. I would personally go with the single 4.5" port.

^Recommended port diameters

Again, not enough port area in a 3" port. Will cause lots of noise still. A round port has a diameter, not a width.

Round ports sound the same as slot ports, they do the same job. Round ports don't need quite as much port area. (Less surface area = less friction = more velocity) Slot ports are easier to integrate, but Round ports displace less airspace. Now for flakko's q's.... Just adding a port to a sealed box isn't going to work if the sealed box doesn't have enough airspace. Best to design the box for the application. Optimal distance is as much as you can give... but bare minimum is the width of the port, so if you have a 3" port diameter, then the port needs to be 3" from the nearest surface down from the opening. Adding a second port will make the length needed longer, you cannot simply make a port that needs to be 14" long into two different ports of 7" long. In fact, in a 3" port's case (in a 2ft^3 tuned to 31Hz enclosure), a single 3" port will need to be 7.717" whereas two 3" ports needs to be 18.073". Also... these lengths I give you apply to ports using PVC-type tubing with no flares, etc. Having flares will change the port lengths, and so will using an aeroport-type port.

Here is the lengths you need for these diameters: 4" - 14.694" 4.5" - 19.00" 5" - 23.874" (2) 3" - 18.073" (2) 3.5" - 27.475" http://www.the12volt.com/caraudio/boxcalcs.asp

Most definately.... (well to an extent of course) A single 2.5" port would have horrible port noise. Here is a decent thread to read: http://www.soundsolutionsaudio.com/forum/i...?showtopic=2978

How large of diameter of port will you be using? I would aim for something in the 4.5" - 5" range or 2-3". 2 ft^3 tuned to 31Hz will sound very good.

^^^, but in all reality, need to model the response to tell you what frequency to shoot for. Then back it up with an impedance curve.

!!emoclew

Listened to alot of classic stuff like Neil Young, Cat Stevens, James Taylor, CCR, Bob Seger, etc lately.

!!emoclew

Tune to the frequency that the output will peak at... in most cases, if you need to burp at 47Hz, tune around 35-37Hz. Are you sure you are tuned to 52Hz? That just seems so not right that you are loudest below tuning.

Off to work for this guy... cya'll

The new job I start on Aug 29th, I get $2500/year increase every year for the first three

Actually, there is bendable plywood available. Also, I have bent plywood numerous times around frames of odd shapes. It gets tougher with thicknesses, but 3/16" and 1/4" can easily be done. Soak it in water for about a day, then bend and staple, nail, screw around the frame and let it dry. Then you can remove the frame and it should warp from drying to the desired shape. But like you said, time consuming. <{POST_SNAPBACK}> that's the way to go... Overall, I would rather have as straight & short of a port as possible. -Nick <{POST_SNAPBACK}> Me too, less turbulence = higher port velocity = good.

Not as he explained it... on the outside yes, but not on the inside.

Fleece would actually be detrimental... the fibres will cause more friction on the airflow.

Another shining example why I think ca.com is the biggest waste of space on the net...

lol, where I grew up there is maybe 1000 people in a 75-100km radius. And the only trees are those that were planted.

That is a swather ^. We don't use one on our farm. We straight-cut everything with the large swathing header on the combine.

Welcome to the good side I rarely post in IHoP, I'm an anomaly.

I would think the RL-p would sound like heaven in one. It would allow for a ton of low-end grunt, without sacrificing the bass up top (40-60Hz). SQL lovers dream really.