checking calculations

[mountainhick]

I plugged some driver parameters into an online enclosure calculator. Just want someone who knows enclosure calcs to double check for me. I am a great woodworker, but I totally suck at math.

Does this work out correctly?

Driver:
Fs: 24.0000 Hz (Free air resonance)
Vas: 2.6486 ft^3 (Compliance volume)
Qts: 0.2190 Total Q
Qms: 1.3000 Mechanical Q
Qes: 0.2640 Electrical Q
Sd: 0.0130 M^2 (Piston area)
Xmax: 3.1800 mm (Cone excursion, linear)
Revc: 6.5000 ohms (DC resistance)
Znom: 8.0000 ohms (Nominal impedance)
Pmax: 35.0000 watts maximum rated power


Closed box results:

Vas = 2.65 ft^3
fs = 24 Hz
Qts = 0.219
Qtc = 0.707

Vb = 0.28 ft^3
f3 = 77.49 Hz
fb = 77.48 Hz

Also, for using a pair in a single enclosure, do I just double the box volume?

Thanks

 

[bjorno]

I plugged some driver parameters into an online enclosure calculator. Just want someone who knows enclosure calcs to double check for me. I am a great woodworker, but I totally suck at math.

Does this work out correctly?

Driver:
Fs: 24.0000 Hz (Free air resonance)
Vas: 2.6486 ft^3 (Compliance volume)
Qts: 0.2190 Total Q
Qms: 1.3000 Mechanical Q
Qes: 0.2640 Electrical Q
Sd: 0.0130 M^2 (Piston area)
Xmax: 3.1800 mm (Cone excursion, linear)
Revc: 6.5000 ohms (DC resistance)
Znom: 8.0000 ohms (Nominal impedance)
Pmax: 35.0000 watts maximum rated power


Closed box results:

Vas = 2.65 ft^3
fs = 24 Hz
Qts = 0.219
Qtc = 0.707

Vb = 0.28 ft^3
f3 = 77.49 Hz
fb = 77.48 Hz

Also, for using a pair in a single enclosure, do I just double the box volume?

Thanks

Hi mountainhick,

You are right, doubling drivers in a closed box, doubles the volume.
Some verifying calculations:

b

 

[PeteMcK]

Unibox gives me a Qtc of .251 for 2.65 cu ft, an f3 of 71 and an fb of 95.5 for .28 cu ft;
yes, you double the box vol for 2 drivers.
are you using these as mids? if so, a sealed box of ~ 9L (.32 cu ft) looks good for 2 drivers for a Qtc of ~ .707

 

[mountainhick]

Cheers. Yes, these will be used with a subwoofer and crossed over around 80hz