JL Audio 18w6's Powered by Memphis Mojo

[RaiN 10+ year member]

I'm thinking about powering my 18w6's with a Memphis Mojo MC2000... Can the JL's Take the 1kw each with the gains low?

I did some searching but couldnt really find a good source to my answer. I currently am feeding them about 500 a piece, but it looks like they could take more.

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[80INCHES 5,000+ posts]

yes u can run it at 1k each...just set your gains right and your good to go

80

 

[helotaxi 5,000+ posts]

What enclosure? That is going to determine a lot a well.

 

[AK SloPok 10+ year member]

**** boy ain't you deaf yet?

His "enclosure" is something like 2.2 cubes each ported to 32... actually I think 80 designed it if I recall correctly.

He just needs to put the FIs in and call it a day...

 

[80INCHES 5,000+ posts]

his box is 8.9cubes with 110 sqaure inch port tuned to 30hz

80

 

[RaiN 10+ year member]

^ 80's got it right! I think I may have to switch amps to see what happens.

Guess I HO Alt is in my future.

Helio, I read several of your posts before, can you go into more detail about how the enclosures size determines usable wattage.

 

[80INCHES 5,000+ posts]

^ 80's got it right! I think I may have to switch amps to see what happens.
Guess I HO Alt is in my future.

Helio, I read several of your posts before, can you go into more detail about how the enclosures size determines usable wattage.

i can tell u that

the bigger the box the less power needed to achieve high output...the smaller the box the more power is needed to the high output or a bigger box

80

 

[helotaxi 5,000+ posts]

Well not only is less power needed to get high output but less power is needed to drive the sub past its excursion capabilities and destroy it mechanically. Sub power rated power handling is only half of the equation. It only covers the amount of power that the motor of the sub can thermally dissappate for an extended period of time (forever, theorectically). The othe half of the equation is keeping the sub from reaching its excursion limits and being mechanically damaged. This is entirely related to the enclosure, both volume and tuning. The larger the enclosure, the less control the enclosure exerts on the sub. This lack of enclosure damping also lends to the efficiency of the enclosure. It can get louder with less power, but it it can't handle as much power either. The limiting factor is the ratio of the volume of the air moved by the sub to the overall volume of the enclosure. In a really large enclosure this ratio is really low. Effectively the enclosure will reinforce the sound from the driver via the port but won't aid in the control of the cone. Final result is the extra output but the sub acts like its in free-air except right at the tuning freq where the inertia of the air moving through the port increases the effective ratio of moving volume to the enclosure volume.

 

[RaiN 10+ year member]

Is running the Mojo a bad idea then?

 

[helotaxi 5,000+ posts]

In this case you should be fine. A subsonic filter is in order, though. 2nd order around 25Hz.

 

[audioholic 5,000+ posts]

Sounds like a sweet system. Keep us updated on how it works out.

 

[FLOSSINON24S 10+ year member]

1k will be fine, i ran 2 pa 2250d's on my 3 jl 18w3s

 

[BassAddictJ 5,000+ posts]

videos???

 

[FLOSSINON24S 10+ year member]

i dont have any vids, i got rid of the truck 4 years ago.

 

[RaiN 10+ year member]

Those 18's took the power then with no complications?