box for 4 TYPE R'S

[camakasisco 10+ year member]

i need help designing a box for my car. its a 90 honda civic hatchback and got to be ported. i got 4 type r 12's . i want the magnets sticking out. but 2 are D2 and 2 are D4. im waiting for 4 1000 watt alpine amps. and they got to be divide in to 4 chambers. this is the first box im making. thanks

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[Rawr-DQ 10+ year member]

Pics of the hatchback

 

[camakasisco 10+ year member]

ok i will take some

 

[BJ The Man 10+ year member]

Figuring out how you will wire those so they all get the same power will be fun!

Why did you get two d2 and two d4?

 

[BrianChia 10+ year member]

I guess you could bridge two of the amps and run two of the Type-R's in series then one amp each for the other two subs at 8 ohms each. Or you could run the two D4's with coils in series in parallel at 4 ohms each with two bridged amps and the other D2s with coild in series each with their own amp seeing 4 ohms each. Haha, why DID you get mismatching impedance on the subs? Any rational explanation for that?

Also give some max dimensions for the box design.

 

[camakasisco 10+ year member]

im hooking up 4 alpine 1000 watts to them. 1 amp to 1 sub. i had 2 of them. and i bought the other 2 off my buddy for 5o bucks. all i know is i want it to hold 4 12's.one in its own chamber. but all in one box. im getting pics of the trunk and the subs. im waiting for the amps.

 

[itzme218 10+ year member]

so the amps you ordered does 1000@1ohms/ 1000@2ohms?

 

[PSturmer 10+ year member]

its ok if the subs are d4 and d2 since those amps push the same power out at 1 ohm and 2 ohms. but i still would do dual chambers.

take some pictures and measurements. when i get back from a competition on monday i will help you out.

 

[BrianChia 10+ year member]

The sensitivities of the subs will be different running at different impedances. The drivers running at 1 ohm are going to draw more power than those running at 2 ohm and overall power consumption is going to be more--the output will be up to 3db greater for the lower impedance subs, depending on the amp's capabilities to run at lower impedance. You can adjust the gain and calibrate the SPL for each sub to match the sensitivities but the lower impedance systems will still draw more current to reach a certain amount of wattage while running at a lower voltage (Ohm's law). You're 1 ohm setups are going to be running hotter with more current and the amp will wear faster than with the 2 ohm setup. Furthermore, the amplifier damping factor will be different for each setup. The 2 ohm system will have 2x the damping factor of the 1 ohm system, meaning it will tend to play with less distortion and have better transient response at higher power levels, but it will not match the 1 ohm driver in overall output.

So I guess it is OK, but it is not optimal.

 

[jellyfish420 10+ year member]

The sensitivities of the subs will be different running at different impedances. The drivers running at 1 ohm are going to draw more power than those running at 2 ohm and overall power consumption is going to be more--the output will be up to 3db greater for the lower impedance subs, depending on the amp's capabilities to run at lower impedance. You can adjust the gain and calibrate the SPL for each sub to match the sensitivities but the lower impedance systems will still draw more current to reach a certain amount of wattage while running at a lower voltage (Ohm's law). You're 1 ohm setups are going to be running hotter with more current and the amp will wear faster than with the 2 ohm setup. Furthermore, the amplifier damping factor will be different for each setup. The 2 ohm system will have 2x the damping factor of the 1 ohm system, meaning it will tend to play with less distortion and have better transient response at higher power levels, but it will not match the 1 ohm driver in overall output.
So I guess it is OK, but it is not optimal.

x2

and the 3db increase is not exactly true, but whatever.

i wouldn't do it. its just asking for crappy sound/problems...

 

[BJ The Man 10+ year member]

You could sell two to me to 50 bucks and get your money back so you can buy two more that are the same VC configuration!

seriously though.