how will this do???

Systems

ok i just orderd 1 12 inch polk momo2124 and its goin in a sealed q-logic box with 0.88 cubic foot internal volume and a Profile CA800 off crutchfield.how hard will this 1 12 inch momo hit??in a couple mounths im goin to order another polk 2124 and a Profile Clarus CL1200 .YAAAAAAAA i cant wait till i get that sub

Systems

Not very hard, port it. The profile puts out 600w @ 4ohms bridged right?

exalted512

Originally posted by Altec88
Not very hard, port it. The profile puts out 600w @ 4ohms bridged right?

yeah...porting a momo is NOT smart
-Cody

Systems

ya right im really goin to port that man lemme tell ya.no its goin in a sealed box and yes it puts out 600 watts

LittleCar_w/12s

I ran my DB12's ported in a 1.2CF box, but that was only 150wRMS. tell you the truth they still sound better when I have the ports closed, which I had to do when I got my 700W amp. I still run them in the 1.2 box, but ports sealed, even though I only have my emergency 100wx2 running (700 died).

The suspension NEEDS no ports.
-Jerry

Systems

Originally posted by LittleCar_w/12s
I ran my DB12's ported in a 1.2CF box, but that was only 150wRMS. tell you the truth they still sound better when I have the ports closed, which I had to do when I got my 700W amp. I still run them in the 1.2 box, but ports sealed, even though I only have my emergency 100wx2 running (700 died).

The suspension NEEDS no ports.
-Jerry

Do 2-2.5ft^3 tuned to 28hz......amazing.......why not port it?????

1.2 is too small for a momo......

exalted512

Originally posted by LittleCar_w/12s

The suspension NEEDS no ports.
-Jerry

lol...
The suspension CANT HANDLE ports
well...its one of those...
-Cody

Systems

couse i though the momos were not made to be in ported.it sounds better in a sealed box

Systems

Originally posted by startzy
couse i though the momos were not made to be in ported.it sounds better in a sealed box

Have you heard them ported?

AustinKP

Originally posted by Altec88
Have you heard them ported?

Polk strongly recommends that the MM1024's NOT be ported. The suspension wasn't designed or intended for a ported box. Porting one would just be asking for trouble...

Systems

ya iv herd it ported at cc and the 12 inch gnx sounded better than the momo 2124 and both were ported but the gnx is made for sealed,ported and bandpass

Systems

Originally posted by startzy
ya iv herd it ported at cc and the 12 inch gnx sounded better than the momo 2124 and both were ported but the gnx is made for sealed,ported and bandpass

I bet ya it was a prefab box...........

LittleCar_w/12s

Seriously now... I don't know about the momos, but the old DB's (and from what I hear, the momos too) need the pressure behind them to work better.
Given that I've tried them ported, tuned, etc... they STILL sound better in a sealed enclosure. Also, the nice little thin butyl rubber surround will be more stable in a sealed box... the air pressure behind the sub helps it keep a ballooned shape, thus increasing the stability of the surround. From my diagnosis, this is the most important part of the small sealed box application. It not only looks much tighter in operation sealed than ported, it sounds better too.
Josh, Thom, Kim???? Any thoughts from your design crew at polk?

-Jerry

Systems

well i orderd the sub,amp and box at the same time and its a sealed box and it matches the sub so im not goin to with ports couse iv allways herd there spost to be in sealed and id get better sound quailty out of a sealed anyway.all i wanna know is it goin to put a good amount of bass for 1 12???couse im goin to have that in there for a while from what i hear they pound real hard.

Systems

Originally posted by LittleCar_w/12s
Seriously now... I don't know about the momos, but the old DB's (and from what I hear, the momos too) need the pressure behind them to work better.
Given that I've tried them ported, tuned, etc... they STILL sound better in a sealed enclosure. Also, the nice little thin butyl rubber surround will be more stable in a sealed box... the air pressure behind the sub helps it keep a ballooned shape, thus increasing the stability of the surround. From my diagnosis, this is the most important part of the small sealed box application. It not only looks much tighter in operation sealed than ported, it sounds better too.
Josh, Thom, Kim???? Any thoughts from your design crew at polk?

-Jerry

What did you have them tuned to? How many cubes? The surround theory was GREAT......So Infinity perfects should be sealed also because of the rubber butyl surround????????????

I did 2.5ft^3 tuned to 28hz.....Sounded alot better and louder than sealed......those are the older momos....(much better ones IMO)

Systems

Originally posted by startzy
well i orderd the sub,amp and box at the same time and its a sealed box and it matches the sub so im not goin to with ports couse iv allways herd there spost to be in sealed and id get better sound quailty out of a sealed anyway.all i wanna know is it goin to put a good amount of bass for 1 12???couse im goin to have that in there for a while from what i hear they pound real hard.

Well it's not going to pound real hard, but yes it will create a decent amount of bass. Momo's are alright if you can find them cheap.....

Systems

How much did you pay for all this????????????

exalted512

Originally posted by Altec88
the older momos....(much better ones IMO)

ive had both for long periods of time, i like the ones better
but to each his own:)
-Cody

Systems

i paid 350 for the amp i 12 inch momo and a box

neomagus00

altec - i assume you've heard them in a properly designed sealed box?

the surround-balloon theory - while i make no judgement as to the truth or falsity of this theory, the infinity surrounds would not apply here because it was specifically stated that the backpressure helps a thin surround.

theoretically, your setup provides a single decibel of additional spl, with a significant loss of cone control. if you can provide better numbers (the current amp debate notwithstanding) or can tell me additional details about your box construction, you may come out on top on this one.

for now, i have to stand by the manufacturer of the product and accept their recommendation that the sub not be put in a ported box. even a properly tuned ported box will only add 3 db to the output at the cost of transient response and, worse, unloading below the tuning frequency (read: overexcursion and badness). even if polk said "hey, go for it, hell, do 6th order bandpass" i'd still go sealed

finally, near the beginning of the thread, you stated that "1.2 [cubic feet] is too small for a momo" in reference to jerry's db12's... now, if i'm not mistaken, the db's are not a momo line...

LittleCar_w/12s

True.. DB's aren't momos.
I haven't got to mess around with the new momo's but my assumption is that given they have similar characteristics, I'd assume that polk kept their surround design to the greater extent. When I explained the "Suround Balloon Theory", as we will dub it from now on I guess... I am referring to surrounds like the ones on my DB's. I don't believe the infinity's are anywhere close to this thin. Example... One can take their finger and poke the surround completely inverted without damaging it. This is a thin surround, and IMO needs the support from the rear air pressure... It's a VISIBLE effect, even.
I am not sure where, but there was a recent reply in a post.... said something about "...could see the -rubber- surround flopping about like jello..." (I think it was a post about foam surrounds v.s rubber) My guess was that the sub didn't have the proper volume behind it, or was ported.
-Jerry

Jstas

Man, it's like teh blind leading the blind in here.


Hey Altec88, I hope you didn't plan on utilizing any warranty on those MOMO's. You must not be pushing a whole lot of power through them. Otherwise you'd be here bitching at Polk Audio because you shredded your spiders.

LittleCar_w/12s

:cool:
/\
|| '\

Yep.. Blind...

Systems

well i just got my stuff and it sound real real nice

LittleCar_w/12s

That's the important part. (at least for me) plus, you got a good deal on the setup too.f Congratulations on your new sound!
-Jerry

Systems

The lack of pressure behind the cone will merely make it more efficient and reduce the mechanical power handling capabilities of the driver (except at the tuning freq). Obviously there's a big difference between small sealed and large ported enclosures, but the surround isn't going to collapse or anything. It's formed rubber... you could play it freeair and it'll retain it's shape.....Yes I have heard momo's sealed, I prefer ported, same SQ with a boost of output. I gave my momo 500w and it took it fine....

Rubber surround flopping around???? There is something seriously wrong with the sub if that's happening. It won't flop around freeair....

I meant momos, not the DB's.....

"theoretically, your setup provides a single decibel of additional spl, with a significant loss of cone control. if you can provide better numbers (the current amp debate notwithstanding) or can tell me additional details about your box construction, you may come out on top on this one."

A single decibel? Where'd you come up with that? Please explain the "loss" of cone control......What details do you want about my box?

exalted512

Originally posted by Altec88
The lack of pressure behind the cone will merely make it more efficient and reduce the mechanical power handling capabilities of the driver (except at the tuning freq). Obviously there's a big difference between small sealed and large ported enclosures, but the surround isn't going to collapse or anything. It's formed rubber... you could play it freeair and it'll retain it's shape

word of advice Jason, when youre old enough to go to college, dont copy and paste stuff from other websites, its called plagiarism and it can get you into a lot of trouble
-Cody

neomagus00

oooh, yes, much badness lies down that path...

unless of course he wrote it in the first place.

exalted512

Originally posted by neomagus00
unless of course he wrote it in the first place.

i dont make accusations i cant back up:D
-Cody

Systems

I'm old enough

So do you understand my point? Please don't say momos are bad ported if you haven't heard them in a ported box, or a correctly made ported box, just because they say you can't, doesn't mean you can't. Adire subs are made for HT, we use them in our cars ......and yes the rubber surround theory is a complete myth ........

exalted512

old enough...as in 18 on september 18th?
yes i know everything

good sound or not, momos are not built to be ported, you port them, they die...ive seen it happen
-Cody