help with slotted port enclosure for Eclipse SW9152....

[capthooklv]

I am ready to build my first slot ported box for a single Eclipse SW9152 15" woofer dual 4ohm voice coils. Going to wire in paralell and run it with an Orion 2500D mono at 2ohms. Speaker did not come with specs Eclipse factory said optimum is 4.75 cubic ft of air space with a slotted port 15" widex3" high x 18" long. This is going in the bed of my 2002 Ford F250 crewcab with shell firing upward.

When i try to make it work on the RE Enclosure calculator it gets tuned at 27hz has 4.753 cubic feet at boxmade with 1"mdf)

width-35.2"

height-20"

depth-19"

square port width-3"

square port height-18"

square port length- 15"

Does this look right?

Should I round off the 1" mdf in port region?

Should i add any bracing?

Should I reinforce the plate that the speaker sits in and double up the wood thickness?

Should I drill pilot holes for all screws?

Does it matter what glue I use?

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[RAM_Designs 5,000+ posts]

1) Does this look right?

2) Should I round off the 1" mdf in port region?

3) Should i add any bracing?

4) Should I reinforce the plate that the speaker sits in and double up the wood thickness?

5) Should I drill pilot holes for all screws?

6) Does it matter what glue I use?

1) I'd do 3.5ft^3 at 30-32hz.

2) Rounding off all port corners is always a good idea.

3) Yes, always brace spans that are greater than 12-16", depending on the equipment used and building material.

4) If using 1" MDF, it will not be necessary.

5) Yes, always predrill and use coarse thread drywall screws(orange label at Home Depot).

6) Titebond II works well, as does industrial grade sub-floor adhesive from Dap and GE.

 

[capthooklv]

I was thinking about 4.8 cubic ft with box tuned to 30hz or should i go with a smaller cubic air space? What is benefit of going with smaller air space?

 

[RAM_Designs 5,000+ posts]

I was thinking about 4.8 cubic ft with box tuned to 30hz or should i go with a smaller cubic air space? What is benefit of going with smaller air space?

A larger box will be more efficient and have a larger peak in the response curve. But it also lowers the amount of power that the sub can mechanically handle. So although the larger box is louder watt-for-watt, there's only so much power the sub can take before tearing itself apart. The 3.5ft^3 box will give you a little smoother response by lowering the size of the peak, and allow you to throw a good deal of power at it as well. It just kinda depends on what you want and how much power you have to work with. Each situation has advantages and disadvantages.

 

[audio_phill 10+ year member]

Here, This may help

Car Audio Classifieds

 

[capthooklv]

I will be using an Orion 2500D wiring the dual 4ohm voice coil parallel bringing impedence down to 2ohm. This should get me approx 1700watt rms at 2 ohm. I am using an older Eclipse eq/ sound processor and only sending 20-80hz to the sub. I have 3- 10" Alphasoniks playing the 80hz-130hz bass off an Orion 1200D.