12" IDMAX....2.5 cu. too much??

[3onDubs 10+ year member]

I just got back from a local audio shop and I was showing the guy there my trunk and discussing my box ideas for the trunk.

I told him that i was planning on putting a 5 cu. ft. ported box in my trunk so that the subs can get 2.5 cubes a piece.

He told me that my whole trunk isn't even 5 cubes and that it wouldn't fit. I told him that i calculated it out and it should work in a 30" X 15" X 20" box. He told me that a box with those dimensions would give me less than 4 cubes total and that they would sound better with 1.75 cubed per sub.

He also told me that the IDMAX V3's (which is what i have) have problems with their glue on the internals getting too hot and melting....he said that you can tell if this happens to you by pushing the sub in and listening for scratching.

He seemed like a very knowledgeable person and he even competes in db drags, so i believed him at first.....are my calculations wrong? Is 2.5 cu. ft. for each sub too much?

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[Toxic Tuan 10+ year member]

The person that you talked to is ME. Your calculations are completely wrong. Like I told you when you were at the shop...it's improper calculations and yet you don't believe so I'll figure it out for you. Here:

After at least wood displacement (not including sub displacement, bracing and port displacement)...

30" X 15" X 20" =

28.5" x 13.5" x 18.5 = 4.119 cf now...minus port and sub displacement...and don't forget bracing.

NOW do you believe me?

 

[Beat_Dominator 5,000+ posts]

Lolerpwnt.

 

[Kevokrook77 10+ year member]

2.5 REAL cu. ft. per ported IDMAX is optimal. That should be fine, just follow Tuan's advice.

 

[3onDubs 10+ year member]

The person that you talked to is ME. Your calculations are completely wrong. Like I told you when you were at the shop...it's improper calculations and yet you don't believe so I'll figure it out for you. Here:
After at least wood displacement (not including sub displacement, bracing and port displacement)...

30" X 15" X 20" =

28.5" x 13.5" x 18.5 = 4.119 cf now...minus port and sub displacement...and don't forget bracing.

NOW do you believe me?

Oh shiet....sup Tuan. My bad bro, let me clarify my last post. I didn't doubt you....like i said, you obviously know what your talking about. This was my first time trying to calculate it, so that's why i was asking...just to double check (cuz i didn't doubt that i could be wrong).

I put my whole system in by myself, but ill admit...im still a complete NooB when it comes to car audio. You have tons of experience, and i appologize for not taking your word right away. It's just that im on my fourth box already and i can't get this figured out!