---------- New: Beta Test! ----------

Online Subwoofer Enclosure Calculator for a 4-Chamber Enclosure with Two Drivers

On this page you are able to calculate an advanced speaker enclosure with Thiele/Small parameter. Diagrams are calculated for frequency response, step response, group delay, voice-coil impedance, velocity of diaphragm and of air in port, as well as displacement of diaphragm and air in ports.

Again, you can design an individual loudspeaker enclosure at the following form. You can leave out chambers, vents and one driver, so that you get the simplest closed box possible. The "Start Window" shows an example of a two-way bassbox in an infinity baffle. This subwoofer box design doesn't need a crossover.

Request for comment: In order to check or improve this simulation, I would be pleased to get measurements of any diy speakers with three or more chambers.

Thiele Small Parameter

Attention: You can put in your own Thiele/Small-parameter only if the speaker-select "parameterinput" is selected. You can change the polarity of the speaker if you make the electrical input power Pe positive or negative.

Speaker D1:
Resonance frequency fS (Hz):
VAS (Liter):
QTS:
QMS: => QES=0.34
DC voice-coil resistance RE (Ohm):
Voice-coil inductance LE (mH):
Effective area of the diaphragm SD (cm2): => (dD=8.52 cm)
-------------------------------------------------------
Electrical input power Pe (W): => eg=2.53 VRMS
Rg (Ohm): => QE=0.34 => QT=0.28
High pass capacitor CHP (uF):

Speaker D2:
Resonance frequency fS (Hz):
VAS (Liter):
QTS:
QMS: => QES=0.36
DC voice-coil resistance RE (Ohm):
Voice-coil inductance LE (mH):
Effective area of the diaphragm SD (cm2): => (dD=16.74 cm)
-------------------------------------------------------
Electrical input power Pe (W): => eg=2.47 VRMS
Rg (Ohm): => QE=0.36 => QT=0.30
High pass capacitor CHP (uF):













Display:


Total Diaphragm D1 Diaphragm D2
Port1 Port2 Port3 Port4 Port5 Port6 Port7 Port8
Phase of Sound Pressure Frequency Response
Impedance D1 Impedance D2 Phase (Impedance D1) Phase (Impedance D2)

Enclosure Parameter:

Attention: If you chose RAP = 0, then you are calculating RAP for air in port.

Air temperature (oC): => CLuft: (343.5 m/s)

Chamber V1:   Volume V1 (Liter):
                  RAB:
                  RAL:
    Port3:  Vent diameter (cm): => (0.00 cm2)
              Vent length (cm):
              RAP:
    Port4:  Vent diameter (cm): => (0.00 cm2)
              Vent length (cm):
              RAP:

Chamber V2:   Volume V2 (Liter):
                  RAB:
                  RAL:
    Port1:  Vent diameter (cm): => (0.00 cm2)
              Vent length (cm):
              RAP:
              Sound travel distance (m): New
              ("Port1 backside to frontside (Speaker D1)")
    Port2:  Vent diameter (cm): => (0.00 cm2)
              Vent length (cm):
              RAP:

Chamber V3:   Volume V3 (Liter):
                  RAB:
                  RAL:
    Port5:  Vent diameter (cm): => (19.63 cm2)
              Vent length (cm):
              RAP:
    Port6:  Vent diameter (cm): => (0.00 cm2)
              Vent length (cm):
              RAP:

Chamber V4:   Volume V4 (Liter):
                  RAB:
                  RAL:
    Port7:  Vent diameter (cm): => (19.63 cm2)
              Vent length (cm):
              RAP:
    Port8:  Vent diameter (cm): => (0.00 cm2)
              Vent length (cm):
              RAP:

D1:
cas=3.23e-8 m⁵/N  mas=3.07e+2 kg/m⁴  ras=5.74e+4 Ns/m⁵  Bl=7.78e+0 N/A  rat=3.48e+5 Ns/m⁵
cms=9.95e-4 m/N  mms=9.98e-3 Kg  rms=1.86e+0 Ns/m
D2:
cas=5.17e-7 m⁵/N  mas=4.50e+1 kg/m⁴  ras=5.39e+3 Ns/m⁵  Bl=8.71e+0 N/A  rat=3.11e+4 Ns/m⁵
cms=1.07e-3 m/N  mms=2.18e-2 Kg  rms=2.61e+0 Ns/m

Chamber V1, Port3, Port4:  Resonance Frequency: 0.00 Hz  Ql: 0.00  Qa: 0.00
Chamber V2, Port1, Port2:  Resonance Frequency: 0.00 Hz  Ql: 0.00  Qa: 0.00
Chamber V3, Port5, Port6:  Resonance Frequency: 44.61 Hz  Ql: 12.08  Qa: 47.31
Chamber V4, Port7, Port8:  Resonance Frequency: 17.85 Hz  Ql: 6.85  Qa: 36.50

last change: 09. October 2015

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