7.6 cu.ft Maelstrom- X 18" build

[sub_junkie]

Thanks for the link. That is basically what I had planned on using once I get it painted.

I really want to be able to disable the HPF on my Yamaha amp
But, then it will probably clip so bad on the low frequencies that it wouldn't make any difference. Would that be true?
Does anybody know how to get a 15hz HPF on the Reckhorn B-1? A few people told me that it wouldn't just work with it set at 15hz, so I was hoping that someone already had a link, or knew how.

Thanks again for the help everyone.

[sub_junkie]

I found a pretty cool thing while playing Bass I Love You by BassTronics.
While in the " main listening position", the 11hz tone is pretty much inaudible.

The listening position is on the right side of my room when you enter it. It is 13x13. I have a closet on the left side of the room again when you are entering it, and it is the same distance in my room as the listening position. It is around 10 feet deep and wide. When I play that song and when I am at the back of the closet, the 11hz tone is ear piercing. When I go to the listening position, the 11hz toneis near inaudible. It's onlyin the closet when you can hear it. I'm assuming this is becuase if some kind of room gain? There is also a storage room right behing where the sub is currently sitting.

Thought this was kinda cool and wanted to see what you guys thought.

[sub_junkie]

I had never realized how many frequencies my KLH 10" sub had been missing. Now, there aren't so many peaks in the frequency range as before, but there are still some.
One thing that was really impresive after listening to that 10", was how low the Mal-X goes which isn't suprising becuase it's an 18".
Will the bass be any "Tighter" once I get the EP2500 over my 150w amp that appears to have a HPF around 35hz?

Thanks again for all of the help guys

[sub_crazy]

If you have a 35hz HPF on you Mal-X then the mid-bass energy probably has it sounding boomy. My Mal-X sealed is not exactly tight but it is not boomy either. I do use a Velodyne SMS-1 though to tame the nasty 55hz peak I get in my room and boost the low-end so it definitely sounds a lot better than no EQ. Instead of tight I would call my Mal-X smooth but nasty when it needs to be.

The Mal-X likes power so you should experience a definite increase in performance once you get your EP2500. Let us all know the difference once you get your EP2500.

[sub_junkie]

I can't wait until I get the EP2500. According to WinISD, I will pick up around 30db everywhere. Should be much better... Can't imagine it then

[Jugix]

sub_junkie wrote:

I can't wait until I get the EP2500. According to WinISD, I will pick up around 30db everywhere. Should be much better... Can't imagine it then

Erm, More like 9dB - 10dB when moved from 150W --> maximum of 1800W.

[fackamato]

Jugix wrote:

Erm, More like 9dB - 10dB when moved from 150W --> maximum of 1800W.

Not to be a nitpick but the EP2500 delivers >2000W with extremely low distorsion in 4ohm bridged, more power than that and the distorsion picks up. Not noticable in the bass regions though, IMO.

[sub_junkie]

Jugix wrote:

Erm, More like 9dB - 10dB when moved from 150W --> maximum of 1800W.

You have to rememer that my 150w amp has a HPF set aroud 35hz and could possibly be third order instead or second order.
Also, according to my graphing, I will have to take back the 30db's more. It is more like 15-25 db's more in the EP2500 bridged mono mode. It's about 15db more at 40hz, almost 20db at 20hz, and 25db's more at 10hz. So it's close to what I said, but I just wanted to clarify that.

[Mike P.]

Dylan, although you don't have a proper amp yet, I'm just curious if you have tried blocking the port to see if you get the "tighter bass" that you're after.

[sub_junkie]

I have plugged the port with a beach towel (lol), and heard little difference on some songs.
I was, however, able to tell a bigger difference on songs with low bass around 10-30hz. It gave it a little tighter bass, but at the sacrifice of clipping the amp due to turning it up more .
I am making sure that I don't clip the amp, but it happens occasionally. I'm not interested in damaging my new sub at all.
My dad was saying that he thinks I should start off with a 500w amp first. The cheapest one I could find was the BASH 500w amp from PE. Just in case I can't get the EP2500, which 500w or so amp would you recommend?

[Mike P.]

Green is the P.E. Bash amp with the default 30 hz HPF.

Pink is the P.E. Bash amp with the HPF changed to 13.9 hz.

Orange is the O-Audio Bash amp with the HPF set at 20 hz and the boost that comes with it.

[sub_junkie]

So it looks like the BASH is the way to go. I will hopefully still be able to get the EP2500 though. Hopefully soldering on the correct capacitor won't be too hard to do, but I'm pretty good with soldering

[sub_junkie]

I have something modeled a little different. Maybe you just had either the box size or the tuning off? Just wanted to make sure that I didn't do anything wrong.

Red is 500w with a HPF at 13.9hz
Silver is the 2000w with a HPF at 15hz.



Is mine basically the same, just I have different spread sheet for WinISD?

[Mike P.]

The 13.9 hz HPF is also with 1 db of boost at 22 hz with a filter Q of 1.0. My SPL range is 70 -125. Your build thread says 7.6 - 7.8 cu.ft, I modeled with 7.7 cu.ft. with the port dimensions you stated which ended up being 14.66 hz.

[sub_junkie]

Oh, ok. I forgot to add the boost. Thanks for pointing that out. I had just estimated there that the port was tuned to 14.75hz on that post. I got lazy
I will try adding the boost and see what it comes out to. Thanks for the help again Mike. Hopefully I can still get the EP2500 though. Would I be able to boost the bottom end with the Reckhorn B-1? Or do I not need to? I probably don't need to, but I was just wondering.

Thanks for the help

[Mike P.]

Model it and see what effect boost would have on the excursion.

[sub_junkie]

Oh, ok. I just didn't know if the B-1 would be able to boost it becuase it uses the HPF set at 10hz and the boost at 30hz. I wanted to check it out first.

[Mike P.]

That should be 20 hz, not 30 hz.

[sub_junkie]

Sorry, that's what I meant to put. I just hit the wrong key. Thanks for correcting that for me also.
But would it still be able to apply boost around 10-17hz, or whatever would be needed?

Thanks again for all of the help Mike.

[Mike P.]

No, since you're using boost at 20 hz to create the HPF at 15 hz, you can't boost any other frequency.

[sub_junkie]

Ok, that's what I thought. Thanks for clarafying that for me.
Would it be easy to clip the Bash 500w amp? That's the only thing I'm worried about getting it instead of the EP2500...

[Kevin Haskins]

Spend the extra money and get the EP2500. There is no comparison in headroom and as long as you are using a sealed sub, you don't need the subsonic filter.

I have an open-box EP2500 in the office that I've used for basic testing. It is $250 if you want it.

Kevin Haskins
Exodus Audio

[Mike P.]

as long as you are using a sealed sub, you don't need the subsonic filter.

This is 7.6 cu.ft. tuned to 14.5 hz. Subsonic is a must with a EP2500.

[sub_junkie]

Kevin Haskins wrote:

Spend the extra money and get the EP2500. There is no comparison in headroom and as long as you are using a sealed sub, you don't need the subsonic filter.

I have an open-box EP2500 in the office that I've used for basic testing. It is $250 if you want it.

Kevin Haskins
Exodus Audio

I will be asking my dad when he gets home from work to see what he says. Thanks for the offer by the way.

[sub_junkie]

Got Kevin's EP2500 on the way, have the Behringer MIC2200 for a HPF, and the cables should be arriving tomorrow for the MIC2200 and the EP2500.
I have found out that I can move a 3 pound candle on a shelf around with ease now

Can't wait until the amp arrives. Hopefully it can be here Friday. If not than oh well

Thanks for the help and for letting me buy your amp Kevin.