The Official Type R Thread

[Trancer 10+ year member]

Why not? My RE SX displacement is .18

 

[JonJT 10+ year member]

In order to calculate a subwoofers displace, you need to multiply the subs cone surface area by its peak to peak XmaX.

 

[JonJT 10+ year member]

If you can find some T/S parameters, you can do this yourself. I checked Alpine's site, and like all other name brand companies, they dont publish T/S data. SD is the cone surface area and I know you know that Xmax is XmaX. Just be careful, youll probably have to convert units. Most manufacturers only list one way XmaX and list the XmaX value on mm while they list cone sufrace area in square centimeters, inches or feet.

 

[audioholic 5,000+ posts]

Uh.. are we talking driver displacement inside the enclosure, or are we talking linear displacement of the cone? //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[Phelptwan 10+ year member]

driver displacement. Hence the reason I'm baffled.

 

[Crown_amps]

Well in that case, I would get a SWR-1222 and wire it down to 4 ohms. They can take on 1000 watts rms, just make sure its clean signal and not clipping.
As for how big the coil is, I cant remember

your saying the type r can take double its rms rating...god **** why even buy the type x hahahaha.

i have heard some spl boxes rather than a sq set up and the guy at the store said you tune the port high ....is he on crack?

too bad you dont know the coil ....its not on the site either cheese

 

[Crown_amps]

I just bought a 12" type R (1222d). Looking at the sub and looking at the spec sheet boggles my mind. The spec sheet says .071 ft^3. This sub is freaking huge. I really don't think the displacement could be that small. Can anybody confirm this?

what is the coil size on that bad boy? and magnet weight

 

[JonJT 10+ year member]

Uh.. are we talking driver displacement inside the enclosure, or are we talking linear displacement of the cone? //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Well he did say .071 cubic feet. No subwoofer could function properly in an enclosure that small, physics owns us.

 

[Decado 10+ year member]

Bump

 

[GTonDubs 10+ year member]

I just bought a 12" type R (1222d). Looking at the sub and looking at the spec sheet boggles my mind. The spec sheet says .071 ft^3. This sub is freaking huge. I really don't think the displacement could be that small. Can anybody confirm this?

yes that is the correct displacement

 

[GTonDubs 10+ year member]

your saying the type r can take double its rms rating...god **** why even buy the type x hahahaha.
i have heard some spl boxes rather than a sq set up and the guy at the store said you tune the port high ....is he on crack?

too bad you dont know the coil ....its not on the site either cheese

the type r will take alot of power but i can most definelty smell the VC when its pushed hard for a long period of time, we just put a 12" R in my friends car with the 1000w RMS V12 alpine amp, and it straight hits, go by this rule, if it blow that just means its time for the X and you should be good

he's not on crack

the higher you tune it the more narrow the frquency response gets, and the sensitivity is raised,

50-80 hz tunings put out some high numbers but will not play music for shit-

but thats what makes hitting high SPL at lower hz more impressive

until the 20-80 hz rule was made for the db drags, alma gates set her world record a long time ago- 172**somthing- with a 120hz tone

 

[pd298 10+ year member]

I have a question. How are you going to power the amp itself?

 

[audioholic 5,000+ posts]

Well he did say .071 cubic feet. No subwoofer could function properly in an enclosure that small, physics owns us.

What Jmac said. I said driver displacement inside the enclosure (usually just called 'driver displacement' in specs), I did not say enclosure volume. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[bimma85 5,000+ posts]

Well he did say .071 cubic feet. No subwoofer could function properly in an enclosure that small, physics owns us.

//content.invisioncic.com/y282845/emoticons/rolleyes.gif.c1fef805e9d1464d377451cd5bc18bfb.gif Make sure you know what you're saying before you make a smart *** comment //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif. And yes its .071.

 

[Trancer 10+ year member]

I have a question. How are you going to power the amp itself?

Well there is a little power cord that plugs into the wall //content.invisioncic.com/y282845/emoticons/thumbsup.gif.3287b36ca96645a13a43aff531f37f02.gif