two 2213H for subwoofer?

[MatthiasA]

Hello!

my question - are two 2213H drivers from A 4312 Studio Monitors
suitable for a vented subwoofer?
how much liters would you prefer?
has anybody Thiel Small Parameters for calculation?

Greetings Matthias

[remusr]

Dual 2213H's should be great - sens is lower than a 15" by 3-5dB but they take alot of power, >200w on my system, and may be a bit faster than a 15. Impedance is a bit low, in the 6 ohm range so watch that if parallel them. Here are the Thiele-Small, you should be able to find the whole list in Tech Lib or search for it:

fs=25 cps
Qts=0.49
Qms=8.5
Qes=0.52
VAS=8.3 cf or 235 L
Eff=0.68 %
PE=75 watts
Xm=0.31" or 0.62" P-P
Dia=9.8 in
Sd=75.4 in2
Vd=23.3 in3
Re=4.4 ohm
Le=0.6 mH
BI=8.9 T-m
Mms=85 g
FluxDens=1.0 T

[GordonW]

2213H has same parameters as the 123A, to all significant degrees. Check out this thread for a design I came up for isobaric loaded 123As... you could always just cut the volume in half and the port area in half (keeping the same port length), and use only two drivers in a single clam-shell pair:

http://audioheritage.org/vbulletin/s...=123A+bandpass

If you wanted to run a standard vented enclosure for a subwoofer, I'd recommend at least 4 cubic feet PER 123A/2213H. Tune the box to somewhere in the low-20Hz range (ie, around 23-25 Hz or so)...

Regards,
Gordon.

[MatthiasA]

hello - thanks a lot for this information

i calculated with bass box pro
do you thinks its ok ?

greetings matthias



here with crossover ...
but why is the curve over 2khz?
what part values would you take?

[MatthiasA]

how much liters has the orginal 4312 monitor?
do anybody know the dimension of porttube?

greetings matthias

[Robh3606]

Hello Matthias

You have quite a peak there at 60hz. Don't know what your room dimensions are but many rooms have modes in the 50-70Hz region and dropping a sub in with a peak there????? Don't you have the ME120?? drivers???. What do you need bass fill below 50Hz or so?? Problem with that driver is for you to get extended bass out of it with a smooth peak free curve you need very large cabinets. There are better choices if you need smaller boxes. Watch the Xmax on the larger more extended tunings.

Rob

[MatthiasA]

Rob - thanks a lot
i didn't know that the peak at 50 hz
isnt so good for many rooms
(my little room has about 20meters²)
in which range should be the curve?
smaller cabinets are better for me!

how much cu feet has the orginal 4312?

[Fangio]

Hi Matthias,

the 4312 L,R enclosures have 597x362x298mm. Hope that helps for a circa-calculation in litres.

Porttube diameter is 70mm.
F.

[MatthiasA]

Hello Fangio
ive read your 4312 Thread!!!
how long is the Porttube?

greetings Matthias

[Fangio]

Arrrgh..

the 2 porttubes that were left from this project were sold with the crossovers on ebay and shipped to a french buyer yesterday.

I will screw out one 2213 and get back to you then.

[Zilch]

Hello Matthias.

Try single-tuned compound isobaric bandpass, as Gordon suggested above.

105 dB enough for your room?

Here, then, two 123A clambshell (face-to-face) in a total 3.75 cu.ft.:

[Everybody's runnin' BB6P for Matthias this morning.... ]

[Robh3606]

If you can get them into large boxes they look great. The basic point is why start with a peaked responce.You can sometimes work around problems in the room with placement however some times you can't. Even if you get thing set-up where your placement is perfect you still have that peak that will be very audible. It will be one note bass without some for of EQ to balance things out to get the smooth extended bass you are looking for. Attached are links to two room mode calculators. The JBL one is basic. The one from Stereophille you can place your speakers and see what the results would be at your prime spot. They are both lots of fun to mess around with.

http://www.harman.com/wp/index.jsp?articleId=131.0


http://www.ultimateavmag.com/news/10388/index.html

You have Bass Box run them as extended bass. You get a great looking curve but pull up the X Max plot and Max Input Power and bellow 40hz you have some real issues with power handling in this alignment. Even sealed Hi Fi you have a problem. Try 4 Cubic Ft. Thats the blue plot on the screen shot.

Have fun!

Rob

[Robh3606]

Hey Zilch

We doing this at the same time??

Rob

[Zilch]

Hey Zilch

We doing this at the same time??

Rob

Hee, hee. Box design is FUN!

Many options to try.

Everything I've built according to BB6P has worked better than anticipated.

Bandpass designs are quite amazing how they perform in comparatively small boxes. I was using 123A above. With 2213H, it's only 3.23 cu.ft. total for the same performance, essentially. Heavy damping in the closed chamber flattens it, too....

['Course, they pretty good in REALLY BIG boxes, too! ]

[MatthiasA]

both curves are great!

i want to see the both 2213H .. in a isobaric sub i cannot see the drivers...
are the 4 cu feet for one 2213 or fo both ?
rob could you send me the bass box file?
what for a port tube did you take?

greetings matthias