Eclipse SW8200

[ultimate157 5,000+ posts]

id like to see a scan of the enclosure requirements. thanks!

x2...

 

[m48xhp 10+ year member]

ok, the manual was emailed to me. If I read it correctly, a 10" has a lower frequency response in a sealed box than a 12". Is this correct? And Im not really sure what the graphs represent in sq/spl. so if someone can recommend me the best SQ box for 2 12"s, let me know.

http://www.3.8mustang.com/forum/attachment.php?attachmentid=101605&d=1155094139

 

[ultimate157 5,000+ posts]

sweet, 1^3 it is !

 

[ultimate157 5,000+ posts]

Good thing I waited for the Box information, as I bought it for $20 cheaper. Will let you know how well it sounds ^_^

 

[m48xhp 10+ year member]

can someone explain the graph and numbers a little better for me. im trying to find the optimal SQ enclosure for this sub and the direction the fire itph

 

[m48xhp 10+ year member]

Eclipse Tech told me 2 sw8200's and a da7122 is a "No". Im guessin because of the ohm load.

 

[ultimate157 5,000+ posts]

Does anyone know the volume displaced by this driver? It got such a massive magent + heatsink on it.

I am going to build the box today.

 

[Kezzainc]

There is no set size. I sale these subs and have had the sub through my car, i feel it should be in quite a big box. Maybe 1.8 - 3.0 Cu. Everyone has a diff idea though. Depends on what sound you like. Smaller = Tighter Sound. Smaller= More need for power. Good Luck.

 

[m48xhp 10+ year member]

There is no set size. I sale these subs and have had the sub through my car, i feel it should be in quite a big box. Maybe 1.8 - 3.0 Cu. Everyone has a diff idea though. Depends on what sound you like. Smaller = Tighter Sound. Smaller= More need for power. Good Luck.

Remotia recommended 3.0-5.0 cu ft. im probably gunna end up with one around 3 cubes on about 750w.

 

[newtitan 10+ year member]

read the last few posts on box size rec from a guy from tcsounds

http://www.diymobileaudio.com/forum/showthread.php?t=4147

or use the the tcsoundds page direct

http://www.tcsounds.com/lms4000.htm#diy

 

[ultimate157 5,000+ posts]

Anybody know what the final load the amplifier will see using this motor? I have seen specs for it saying both 4 ohm and 3 ohm.

If it is truely 3 ohms, then an amplifier that puts out 600w rms @ 4 and 1200 @ 2 ohms will put out roughly 900 w rms @ 3 ohms (estimated)

Is this correct ?

 

[Kezzainc]

I see around 3ohm on the one i am with. But every sub is diff.

 

[ultimate157 5,000+ posts]

I should've thought of it earlier, but I measured the resistance on the wires I have as it connects to the amp. It reads 3.5 ohms

So if it's 3.5 ohms, then an amp that produces 600w @ 4 ohms and 1200w @ 2 ohms should put out 750w @ 3.5 ohms?

Is this correct?

 

[strong*I*bumpin 10+ year member]

here's a review done over @ the DIY Mobile forum....http://www.diymobileaudio.com/forum/showthread.php?t=4147.....ooops,already posted above

 

[squeak9798 5,000+ posts]

I should've thought of it earlier, but I measured the resistance on the wires I have as it connects to the amp. It reads 3.5 ohms
So if it's 3.5 ohms, then an amp that produces 600w @ 4 ohms and 1200w @ 2 ohms should put out 750w @ 3.5 ohms?

Is this correct?

No.

What you measure with the DMM is the Re (or DCR) of the subwoofer. This is different than the impedance. The Re is a "constant" value. The impedance, however, will vary with frequency, enclosure size, etc. This is why it's called the "nominal" impedance...it's more of an average that the subwoofer will present over it's intended operating range.

So, in short.....the 3.5ohm you measured is not the same thing as the subwoofer's nominal impedance.

BCAE has a pretty good write-up on the difference:

http://www.bcae1.com/resvsimp.htm