[Lonely Raven]

I'm considering a sealed 15 cf box for the new Mael-X 21"

Though I could probably save money and have pretty similar output with a ported 18" in the same space.

 

[Lonely Raven]

Jaysus! If you're going to make it that big, why not port it?

15 cubic feet, 50% fill tuned to 17Hz (8" ID, 45" long) and a HP @ 12Hz. Excursion never goes over 23mm meaning you only get quality bass! (90 volts input). 120dB @ 18Hz without room gain and with plenty of excursion left.

I get everyone throwing options at me, but I can't tell which one is really the best...because no two suggestions seem to be alike. It doesn't help that I keep on coming up with more options myself. My fiance is pretty open to my building a big box for the theater, it's mostly my own aesthetic that keeps me from building a 20cf ported 21", and my own budget that keeps me from building TWO of them! LOL

 

[Lonely Raven]

That is the way Internet forums work. If you want a plethora of opinions, none of them the same, just ask in an Internet forum. :laugh:

If it were me, I'd just build a big sealed 21". Ignore the people saying you could get more output. The sealed 21" has PLENTY of output and it goes smooth and deep. I love sealed subs but you need a lot of swept volume for them to work well for HT. The smaller drivers NEED to be ported, to give the extra headroom. The 21" has an abundance of output, without the need of porting. It goes subsonic with ease because you don't have the roll-off under the port tuning. It sounds awesome.....

Kevin Haskins
Exodus Audio

Kevin, you are such a very bad influence on me.

Alright, as soon as I get the birthday funds lined up, I'm getting a 21". Get a pair of those little give away drivers ready for me, because I'll post photos of my 21" build in here as well.

Thanks for the gentle prodding.

 

[Lonely Raven]

, glad you talked the bloke into doing the 21", thats going to be awesome.

By 'smaller' do you mean anything smaller than the 21"? :gulp:

Yes, it's a done deal. I gave Kevin a call to hammer out a few details...get this, he's actually talking me down from a 15 cf cabinet to a 10-12 cu cabinet! Anywho, he's got my Credit Card and I'll have a 21" on the way soon. Expect a build log here in the X forums.

 

[Lonely Raven]

Top stuff mate. Can't wait to follow your build thread.

The sad thing about a sealed box...is that nobody will see all the wonderful work that goes into bracing, and the motor of a fine sub driver.

If I could afford it, I'd go old skool car sub and build a 1" plexi window on one side of the box...that's just outa my price range right now considering plexi of that size and quality would cost more then all the MDF combined.

 

[Lonely Raven]

Sweet!

I already have 2 Mal-X 18's but Kevin keeps on coming out with even crazier designs that make me want to spend more money:help:

Would a EP2500 be enough for the 21"? I tried running a single 18" off of a PLX2502 which wasn't enough but my PLX3402 matches up great......too bad I don't have another 3402 for the second 18":crying: My room is on the large size though and open to other rooms besides the fact that I am a sub nut.

According to the owners manual, the EP2500 will run 750watts @ 4Ohms per channel. I think Kevin mentioned to me that is plenty by itself, let alone 2500watts bridged. So even if the numbers are fudged a plenty on the amp, it should have enough juice to drive the 21".

Once I get mine built, I'm going to try the 21" on one channel, and my current dual 10" folded horn on the other channel. But I'll probably just bridge the EP and run the 21" alone.

The EP2500 (or the EP4000 that has replaced it) is a great bang for the buck amp...otherwise it wouldn't be so widely used by so many DIY builders.

 

[Lonely Raven]

No... the 18" & 21" will eat up all the power you can give them. The EP4000 is listed at 2 x 2000W into 2 Ohms. You won't get that out of it because you would trip the breaker immediately and the voltage on the AC line will drop like a rock, but that is not overkill.

Both the M-18" & M-21" have highish DCR 2-ohm coils. The impedance is always above 2-ohms so you won't have any issue using the EP-4000 with each channel driving a coil. That combination should give you plenty of output.

Kevin Haskins
Exodus Audio

I must have misunderstood.

I also read (on the intarwebs) that the EP-4000 really doesn't output what they claim. Or maybe that's just typical internet talk.

 

[Lonely Raven]

None of these amps will in the real world. Your AC line doesn't have the ability to do so either.

The EP-4000 should be more than sufficient for the job. When you compare it to plate amps, there is NO comparison. The pro-amps are much more capable and they are much more reliable on average too.

Kevin Haskins
Exodus Audio

My EP2500 will have a dedicated 20 amp circuit by the end of November. :bigsmile:

 

[Lonely Raven]

oh yeah, I forgot we may be talking "reference" here.... cuz I'm hoping 2 21's in 128cu ft each will be enough...for a while



basshead