executioner X

[robotnation]

I recently got a good deal on two madison 21" executioner X speakers, and was wondering if any of you had plans for a good speaker housing for this driver. if not, do any of you know of any good literature or perhaps some form of math i could use to figure out housings? i am really anal about both sound reproduction and booming bass at the same time, and i still am unclear whether or not porting hurts certain frequencies to help others and things liek that... i need some serious help! If you people could give me some options and tell me what type of housing is loudest i would apreciate it... thanks

[BassAwdyO]

Ever heard of winISD? I am actually very curious myself how these speakers perform.

[robotnation]

the executioner? well i really don't know much about how these numbers translate to sound, since i really can't afford to hear every speaker on teh market, but i do know, the executioner has an xmax of .75 inches (way more air moved than most big brands,) is rated 1000 watt rms and 2000 max, and has an efficiency of 100 w/db/m or whatever the unit is. it is rated to go from about 25 hz to i think 3000 (?.) and from what i have heard they are pretty strong and don't get damaged easily, unlike most other large drivers. compared to what other numbers i've seen out there for high end subwoofers, this is probably one of the loudest subwoofers there is. if only i had an amp strong enoough to find out... i barely ever see an RMS of 1000, and when i do, it usually has an efficiency of 88 or maybe 90. every 3 units of efficiency translates toa double in sound, right? you can do the math... i saw something called the "b52" (?) that was 750 watt rms and efficiency of aobut 104, i would imagine taht speaker is is louder, but it only goes up to 240 hz... anyway thats how they perform.

PS I shook my whole house running them together at 4 ohms on an amp that can only go up to about 100 watts or less for that type of load

[simon5]

Find the T/S parameters for the Madison Executioner X, then use WinISD Pro to model an enclosure.

Do you have lots of space available? These beasts will need maybe 10 cu.ft each.

[robotnation]

yea i have a bit of space, in my room theres enough for two big enclosures in front of my bed, but my big issue is fitting it through door, it can't be more than 27 inches wide or there is a good chance i will scratch the doorframe.

PS these things aren't for use in my room, i am djing with them, in assorted sizes of room (i'm mobile)

[robotnation]

got teh parameters

[simon5]

Since the Qts is so high, it's not so easy to design an enclosure to get flat FR. You'll need to use an EQ and a rumble filter if you go ported higher than 20 Hz.

You could go with 27x39x39 ported (deeper bass and 2 dB louder) or sealed (better driver protection).

That will be two huge boxes hehe!

How low and how high do you want to go with them?
I think you should build a basshorn with it.

[robotnation]

argh this program is frustrating, i can't make a spec sheet for my speaker because a group doesn't match (no, spl, rho, c) when i have it calculate thoe numbers for me, the spl changes to 92.71. thats not the 100 they posted on their website! someone please tell me how to figure out whats wrong...

[simon5]

That's because alot of manufacturers are lying about SPL.

It's not 100, it's 93, believe the program hehe!

They got that number by putting the driver in a small box so it's peaking and they measured 100 dB/w/1m, but that's not right because they'll achieve 100 dB only at 70 Hz.

If you use a box big enough, then you'll get around 93 dB/w/1m across the whole range, not just at 70 Hz.

[robotnation]

damn!!! my dreams of being realy loud are shattered, i would have been better of with another driver... then again they probably lie too, so its still a good choice. Thanks for that info though, i was just about to go crazy with this program.