[AUDFILE74]

i'm in the process of gathering gear for my first ob adventure. i am gonna do a 2way with bass. thinking of using these for the low end. i happen to have a pair  in my stash


http://dls.se/en/car/prod.html?produkt=en_1259

here are the specs

 

OA10D is a 10" subwoofer in Performance open air series.

- Paper cone with foam surround and dual spiders.
- Powerful dual magnet system.
- Can also be used in vented enclosures.
- Complete your installation with the RG10 grille (not included).


   Specifications   
Woofer size   10" (25 cm)
Impedance   4 ohm
Power handling capacity   180 W RMS
Max power handling capacity   360 W
Peak power   500 W
Frequency range   25-2000 Hz
Sensitivity   86,5 dB (1W/1m)
Magnet size   145 mm (5,7"), 80 oz
Outer diameter of woofer   270 mm (10,63")
Mounting depth   153 mm ( 6,02")
Mounting hole   240 mm (9,45")
X-max   +- 9 mm (0,35")
Weight   5,5 kg / 12,13 lb
T/S parameters
single V/C   
Fs    39,9    Hz     Re    3,59    Ohm     Qms    3,19   
Vas    25,5    liter     Vas    0,6    Cuft     Qes    0,55   
Qts    0,47        Sd    314,6    cm²     BL    11,96   

[mcgsxr]

It can work.

FS is low enough.
QTS is getting closer to 0.7 (some say the ideal value).
XMAX is close to good too - more is almost always better for an OB woofer.

Do you intend to biamp the woofers or is it a passive setup with the wide range driver?

[FullRangeMan]

It can work.

FS is low enough.
QTS is getting closer to 0.7 (some say the ideal value).
XMAX is close to good too - more is almost always better for an OB woofer.

Do you intend to biamp the woofers or is it a passive setup with the wide range driver?

I sew QTS=0,47
T/S parameters
single V/C   
Fs    39,9    Hz     Re    3,59    Ohm     Qms    3,19   
Vas    25,5    liter     Vas    0,6    Cuft     Qes    0,55   
Qts    0,47        Sd    314,6    cm²     BL    11,96   

[ThePriest]

I think most of the data looks OK, but the sensitivity is quite low, with only 86,5dB.
You will probably need a separate amplifier for the bass, to adjust for the sensitivity.

/ThePriest

[JCS]

I have only built one pair of OBs, so take my opinion w/ a grain of salt (or two).  I made a slightly modified version of MJK’s passive 2-way using Fostex FF85k (no longer available) and Eminence Alpha 15a.  I like them very much & use them daily.

If you are curious, take a look at:
http://www.quarter-wave.com/OBs/OB_Theory.html

Looking at your driver: I think the Qts is too low.  Using a 20”w x 40” tall baffle w/ driver centered 10” from bottom, I think you will get 86 dB for 2.83v input; F10 about 44 Hz.  Might want to use EQ on it, but then you are putting the driver at risk unless you keep it down to very modest SPLs.  I would use a 200 Hz low pass & a 40 Hz high pass (to limit excursion).  Using 2 drivers will get you additional output; however, unless you have an amp that is stable at 2 ohms, you would need to run them in series, making the XO parts more expensive.  So maybe a miniDSP would be cheaper—you might want to use 2 amps anyway to match levels from the woofer & mid/tweeter.

Remember (or maybe you already know): the acoustic XO point and the electrical XO point for OBs are NOT the same.  Again, check out MJK’s site.

Keep us posted!

[FullRangeMan]

I think most of the data looks OK, but the sensitivity is quite low, with only 86,5dB.
You will probably need a separate amplifier for the bass, to adjust for the sensitivity.

/ThePriest

Add to it the bass freq have an decreasing of 4 to 5db when in OB.

[AUDFILE74]

yes,

i plan to run an amp on the woofer

It can work.

FS is low enough.
QTS is getting closer to 0.7 (some say the ideal value).
XMAX is close to good too - more is almost always better for an OB woofer.

Do you intend to biamp the woofers or is it a passive setup with the wide range driver?

[AUDFILE74]

i want to run thins on the woofer  https://www.parts-express.com/dayton-audio-sa100-100w-subwoofer-plate-amplifier--300-802