12 Dvc 295-185 T/s

[deant]

I have a 12 DVC from years back that I wanted put back into service. Using LIMP I measured the T/S specs and here are results:

Fs = 20.87 Hz
Re = 2.82 ohms[dc]
Le = 5275.73 uH
L2 = 2569.62 uH
R2 = 35.58 ohms
Qt = 0.37
Qes = 0.38
Qms = 8.16
Mms = 211.34 grams
Rms = 3.396924 kg/s
Cms = 0.000275 m/N
Vas = 93.15 liters
Sd= 490.87 cm^2
Bl = 14.260575 Tm
ETA = 0.21 %
Lp(2.83V/1m) = 89.89 dB

Closed Box Method:
Box volume = 62.00 liters
Diameter= 25.00 cm
Coils in parallel

My specs are a fair bit off of published. Has anyone else come up with similar numbers or am I out to lunch? The plan was to use a SBB4 alignment and my numbers dictate a box size .75cuft less than the published specs.

[Ryan]

I used a WT2 and my results are similar in many places , these are my "115g mass added" results.
Fs= 19.11 Hz
Qms= 10.77
Qes= .319
Qts= .310
Re= 2.63 ohm
Le= 1.87mH
Vas= 116.8L
Bl= 14.33
Mms= 207 g
Sens= 90.7 dB

[deant]

Thanks Ryan !

[Chris Roemer]

I have a 12 DVC from years back that I wanted put back into service. Using LIMP I measured the T/S specs and here are results:

Fs = 20.87 Hz
Re = 2.82 ohms[dc]
Le = 5275.73 uH
L2 = 2569.62 uH
R2 = 35.58 ohms
Qt = 0.37
Qes = 0.38
Qms = 8.16
Mms = 211.34 grams
Rms = 3.396924 kg/s
Cms = 0.000275 m/N
Vas = 93.15 liters
Sd= 490.87 cm^2
Bl = 14.260575 Tm
ETA = 0.21 %
Lp(2.83V/1m) = 89.89 dB

Closed Box Method:
Box volume = 62.00 liters
Diameter= 25.00 cm
Coils in parallel

My specs are a fair bit off of published. Has anyone else come up with similar numbers or am I out to lunch? The plan was to use a SBB4 alignment and my numbers dictate a box size .75cuft less than the published specs.

For your specs I'm guessin' it'll reach mid 20's in about 2.7 cf vented.
For deant's I get upper 20's in just under 1.9 cf.

For a pair I got quite a few yrs ago, I was getting more like mid 30's in about 3.5 cf. Yikes! Wish I had either of yours.

Chris

[deant]

If my design turns out I will post the results. I want to try an active assist with SBB4 alignment. I did a quattro 12 like this and the result was completely astounding. Given the boost levels used at such low frequencies the textbooks say it should have destroyed itself within minutes at anything above moderate volumes. In practice it doesn't even come close to its excursion limits with a dayton 240 watt amp, 6 months and still going strong. If the same design type works on the dvc it should be a keeper.